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Cheap flights from St. Louis (STL) to Idaho from $97

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/24. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
STL — BOI
jun. 4 — jun. 111
From?
To?
mar. 6/4
mar. 6/11
1 adult, Economy
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How far in advance should I book a flight from St. Louis to Idaho?

Users have found that booking a flight from St. Louis to Idaho at least 18 days early can save you up to 138% on average compared to booking a flight this week. If booking 18 days before your flight isn’t an option for you, users have found flights from St. Louis to Idaho for as little as $379 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $773 for flights departing within the next 3 days.

What is the cheapest month to fly from St. Louis to Idaho?

Flights from St. Louis to Idaho lean towards being more expensive in March. Prices are generally better when you fly from St. Louis to Idaho in January, with the cheapest ticket starting at $298.

What is the cheapest time of day to fly from STL to ID?

When flying from St. Louis to Idaho, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Cheap Spirit Airlines flights from St. Louis to Idaho

Explore cheap flight options specifically provided by Spirit Airlines for the route between St. Louis and Idaho. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated mayo 30, 2024.
Consider these cheap Spirit Airlines flights we've found departing from St. Louis to Idaho. Be sure to come back soon if the deals available don't appeal to you at this time.
mié. 6/191:55 pmSTL - BOI
1 stop7h 15mSpirit Airlines
mar. 6/259:13 pmBOI - STL
1 stop14h 52mSpirit Airlines
Deal found 5/29$118
mar. 6/183:23 pmSTL - BOI
2 stops29h 47mSpirit Airlines
mar. 6/259:13 pmBOI - STL
1 stop14h 52mSpirit Airlines
Deal found 5/29$145
mié. 6/191:55 pmSTL - BOI
1 stop7h 15mSpirit Airlines
mié. 6/264:03 pmBOI - STL
3 stops24h 25mSpirit Airlines
Deal found 5/29$232
mié. 7/174:02 pmSTL - BOI
1 stop20h 57mSpirit Airlines
dom. 7/211:03 pmBOI - STL
1 stop25h 03mSpirit Airlines
Deal found 5/29$269
lun. 7/12:41 pmSTL - BOI
1 stop26h 58mSpirit Airlines
mié. 7/101:03 pmBOI - STL
2 stops27h 26mSpirit Airlines
Deal found 5/29$292
lun. 7/12:41 pmSTL - BOI
1 stop26h 58mSpirit Airlines
mié. 7/107:28 pmBOI - STL
3 stops21h 01mSpirit Airlines
Deal found 5/29$306
vie. 6/283:07 pmSTL - BOI
1 stop6h 16mSpirit Airlines
dom. 7/77:19 pmBOI - STL
1 stop17h 32mSpirit Airlines
Deal found 5/29$327
jue. 6/208:12 pmSTL - BOI
2 stops25h 11mSpirit Airlines
jue. 6/277:27 pmBOI - STL
1 stop17h 49mSpirit Airlines
Deal found 5/29$396

Cheap Alaska Airlines flights from St. Louis to Idaho

Explore cheap flight options specifically provided by Alaska Airlines for the route between St. Louis and Idaho. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated mayo 30, 2024.
Take a gander at the lowest prices we've found on Alaska Airlines flights from St. Louis to Idaho. Deals are refreshing constantly so come back soon for more options.
mié. 6/267:00 amSTL - BOI
1 stop9h 04mAlaska Airlines
mié. 7/33:59 pmBOI - STL
1 stop7h 00mAlaska Airlines
Deal found 5/29$302
lun. 7/17:00 amSTL - BOI
1 stop9h 04mAlaska Airlines
mié. 7/33:59 pmBOI - STL
1 stop7h 00mAlaska Airlines
Deal found 5/29$334
mar. 6/257:32 pmSTL - GEG
2 stops24h 06mAlaska Airlines
jue. 7/42:49 pmGEG - STL
1 stop7h 10mAlaska Airlines
Deal found 5/28$347
vie. 10/187:00 amSTL - BOI
1 stop8h 24mAlaska Airlines
jue. 10/2412:50 pmBOI - STL
2 stops10h 08mAlaska Airlines
Deal found 5/29$394
jue. 8/157:32 pmSTL - GEG
1 stop6h 26mAlaska Airlines
dom. 8/188:49 pmGEG - STL
2 stops14h 31mAlaska Airlines
Deal found 5/29$433
vie. 10/112:25 pmSTL - IDA
1 stop25h 46mAlaska Airlines
mar. 10/153:50 pmIDA - STL
1 stop7h 08mAlaska Airlines
Deal found 5/30$435
jue. 6/207:32 pmSTL - GEG
1 stop6h 26mAlaska Airlines
lun. 7/110:35 amGEG - STL
2 stops11h 24mAlaska Airlines
Deal found 5/29$505
vie. 6/217:32 pmSTL - GEG
1 stop6h 26mAlaska Airlines
lun. 6/248:30 pmGEG - STL
2 stops10h 24mAlaska Airlines
Deal found 5/29$568

Cheap St. Louis to Idaho flights in May & June 2024

Find cheap flight options from St. Louis to Idaho specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,784,634 searches. Prices were last updated on mayo 30, 2024.
Listed are some of the best fares we've found on flights departing from St. Louis to Idaho in 2024. For more flight deals, be sure to check back very soon.
mié. 6/191:55 pmSTL - BOI
1 stop7h 15mSpirit Airlines
mar. 6/259:13 pmBOI - STL
1 stop14h 52mSpirit Airlines
Deal found 5/29$118
mar. 6/183:23 pmSTL - BOI
2 stops29h 47mSpirit Airlines
mar. 6/259:13 pmBOI - STL
1 stop14h 52mSpirit Airlines
Deal found 5/29$145
mar. 6/187:30 pmSTL - BOI
1 stop22h 47mMultiple Airlines
mar. 6/259:13 pmBOI - STL
1 stop14h 52mMultiple Airlines
Deal found 5/29$192
mar. 6/1812:15 pmSTL - BOI
3 stops32h 55mMultiple Airlines
mar. 6/259:13 pmBOI - STL
1 stop14h 52mMultiple Airlines
Deal found 5/29$219
mié. 6/191:55 pmSTL - BOI
1 stop7h 15mSpirit Airlines
mié. 6/264:03 pmBOI - STL
3 stops24h 25mSpirit Airlines
Deal found 5/29$232
vie. 6/283:07 pmSTL - BOI
1 stop6h 16mMultiple Airlines
dom. 6/306:14 pmBOI - STL
1 stop18h 37mMultiple Airlines
Deal found 5/29$266
mar. 6/256:25 pmSTL - GEG
1 stop7h 20mDelta
jue. 7/412:33 pmGEG - STL
1 stop9h 09mDelta
Deal found 5/28$302
mié. 6/265:56 pmSTL - BOI
1 stop8h 01mDelta
mar. 7/911:55 amBOI - STL
1 stop4h 39mDelta
Deal found 5/29$302
vie. 6/283:07 pmSTL - BOI
1 stop6h 16mSpirit Airlines
dom. 7/77:19 pmBOI - STL
1 stop17h 32mSpirit Airlines
Deal found 5/29$327

St. Louis to Idaho 2024 flight deals

Discover exclusive flight deals for travel between St. Louis and Idaho in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated mayo 30, 2024.
Listed are some of the best fares we've found on flights departing from St. Louis to Idaho in 2024. For more flight deals, be sure to check back very soon.
mié. 6/191:55 pmSTL - BOI
1 stop7h 15mSpirit Airlines
mar. 6/259:13 pmBOI - STL
1 stop14h 52mSpirit Airlines
Deal found 5/29$118
mar. 6/183:23 pmSTL - BOI
2 stops29h 47mSpirit Airlines
mar. 6/259:13 pmBOI - STL
1 stop14h 52mSpirit Airlines
Deal found 5/29$145
mar. 6/187:30 pmSTL - BOI
1 stop22h 47mMultiple Airlines
mar. 6/259:13 pmBOI - STL
1 stop14h 52mMultiple Airlines
Deal found 5/29$192
mar. 6/1812:15 pmSTL - BOI
3 stops32h 55mMultiple Airlines
mar. 6/259:13 pmBOI - STL
1 stop14h 52mMultiple Airlines
Deal found 5/29$219
mié. 6/191:55 pmSTL - BOI
1 stop7h 15mSpirit Airlines
mié. 6/264:03 pmBOI - STL
3 stops24h 25mSpirit Airlines
Deal found 5/29$232
vie. 6/283:07 pmSTL - BOI
1 stop6h 16mMultiple Airlines
dom. 6/306:14 pmBOI - STL
1 stop18h 37mMultiple Airlines
Deal found 5/29$266
mié. 7/174:02 pmSTL - BOI
1 stop20h 57mSpirit Airlines
dom. 7/211:03 pmBOI - STL
1 stop25h 03mSpirit Airlines
Deal found 5/29$269
lun. 7/12:41 pmSTL - BOI
1 stop26h 58mSpirit Airlines
mié. 7/101:03 pmBOI - STL
2 stops27h 26mSpirit Airlines
Deal found 5/29$292
mar. 6/256:25 pmSTL - GEG
1 stop7h 20mDelta
jue. 7/412:33 pmGEG - STL
1 stop9h 09mDelta
Deal found 5/28$302

St. Louis to Idaho flights leaving soon

Find last-minute flight options from St. Louis to Idaho for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated mayo 30, 2024.
Users seeking a last-minute flight from St. Louis to Idaho should consider booking one of these fares. Users should be sure to double check the price, date, and time of their last-minute flight.
vie. 6/73:27 pmSTL - GEG
1 stop7h 49mAmerican Airlines
mar. 6/1110:33 pmGEG - STL
1 stop8h 00mAmerican Airlines
Deal found 5/29$539
vie. 6/76:00 amSTL - JAC
1 stop7h 23mAmerican Airlines
mar. 6/1110:49 amJAC - STL
1 stop7h 40mAmerican Airlines
Deal found 5/29$571
vie. 6/74:45 pmSTL - LWS
1 stop7h 28mUnited Airlines
lun. 6/105:30 amLWS - STL
2 stops30h 44mUnited Airlines
Deal found 5/29$657
vie. 6/79:44 amSTL - JAC
1 stop5h 29mAmerican Airlines
mar. 6/111:03 pmJAC - STL
2 stops18h 30mAmerican Airlines
Deal found 5/29$679
vie. 6/73:27 pmSTL - GEG
1 stop7h 49mAmerican Airlines
mar. 6/113:12 pmGEG - STL
2 stops24h 06mAmerican Airlines
Deal found 5/29$689
vie. 6/74:45 pmSTL - LWS
1 stop7h 28mUnited Airlines
lun. 6/105:30 amLWS - STL
1 stop13h 19mUnited Airlines
Deal found 5/29$692
vie. 6/76:00 amSTL - GEG
2 stops19h 00mAmerican Airlines
mar. 6/113:12 pmGEG - STL
2 stops24h 06mAmerican Airlines
Deal found 5/29$741
vie. 6/74:55 pmSTL - LWS
2 stops31h 18mUnited Airlines
lun. 6/105:30 amLWS - STL
2 stops30h 44mUnited Airlines
Deal found 5/29$750
vie. 6/76:08 pmSTL - JAC
2 stops17h 01mAmerican Airlines
mar. 6/111:03 pmJAC - STL
2 stops18h 30mAmerican Airlines
Deal found 5/29$841

One-way flights to Idaho from St. Louis

Search for one-way flight options from St. Louis to Idaho. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated mayo 30, 2024.
Take a look at some of the best available options we've come across on one-way flights from St. Louis to Idaho. Users can also find round-trip St. Louis to Idaho flights by using the search form above.
lun. 6/242:41 pmSTL - BOI
1 stop26h 58mSpirit Airlines
Deal found 5/29$97
lun. 6/242:41 pmSTL - BOI
1 stop26h 58mSpirit Airlines
Deal found 5/30$102
jue. 8/16:30 pmSTL - BOI
1 stop6h 45mDelta
Deal found 5/29$163
lun. 7/293:18 pmSTL - GEG
1 stop8h 02mAmerican Airlines
Deal found 5/29$182
mar. 11/265:35 pmSTL - GEG
1 stop7h 08mDelta
Deal found 5/28$183
dom. 7/286:06 amSTL - GEG
1 stop7h 09mDelta
Deal found 5/29$193
jue. 8/18:49 pmSTL - BOI
2 stops23h 25mSpirit Airlines
Deal found 5/29$210
lun. 6/242:29 pmSTL - BOI
2 stops10h 21mDelta
Deal found 5/29$217
sáb. 6/227:32 pmSTL - JAC
1 stop16h 19mAlaska Airlines
Deal found 5/29$237

Find flights from St. Louis to Idaho within your budget

Customize your flight search to find flights from St. Louis to Idaho that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated mayo 30, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$118 - $382

Route

Depart

Return

Price

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

mié. 6/19

1 stop7h 15m

Boise Air Term. Gowen Fld

mar. 6/25

1 stop14h 52m

$118

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

mar. 6/18

2 stops29h 47m

Boise Air Term. Gowen Fld

mar. 6/25

1 stop14h 52m

$145

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

mar. 6/18

1 stop22h 47m

Boise Air Term. Gowen Fld

mar. 6/25

1 stop14h 52m

$192

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

mar. 6/18

3 stops32h 55m

Boise Air Term. Gowen Fld

mar. 6/25

1 stop14h 52m

$219

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

mié. 6/19

1 stop7h 15m

Boise Air Term. Gowen Fld

mié. 6/26

3 stops24h 25m

$232

Lambert-St LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

mar. 6/25

1 stop7h 20m

Spokane

jue. 7/4

1 stop9h 09m

$302

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

mié. 6/26

1 stop9h 04m

Boise Air Term. Gowen Fld

mié. 7/3

1 stop7h 00m

$302

Lambert-St LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

vie. 8/16

1 stop6h 51m

Spokane

mar. 8/27

1 stop9h 56m

$321

Lambert-St LouisBoise Air Term. Gowen Fld

STL - BOI

STLBOI

Lambert-St Louis

lun. 7/1

1 stop6h 54m

Boise Air Term. Gowen Fld

jue. 7/4

1 stop5h 03m

$382

Flights are sorted by cheapest first

Deals found on 5/29

No data available for this route at this time. Please check back soon.

Best time to book a flight from St. Louis to Idaho

Have a flexible travel schedule? Discover the best time to fly to Idaho from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Idaho

Get insights into the airlines that provide service to Idaho. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Idaho. Reviews last updated mayo 30, 2024.
Read through reviews of airlines operating flights from St. Louis to Idaho, such as Spirit Airlines, Alaska Airlines and United Airlines. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
9,201 reviews
Check prices

Food

7.3

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Alaska Airlines
8.1
Very good
9,201 reviews
Alaska Airlines
8.1
Very good
9,201 reviews
Check prices

Food

7.3

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Delta
8.0
Very good
10,457 reviews
Alaska Airlines
8.1
Very good
9,201 reviews
Check prices

Food

7.3

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

United Airlines
7.4
Good
10,777 reviews
Alaska Airlines
8.1
Very good
9,201 reviews
Check prices

Food

7.3

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

American Airlines
7.3
Good
14,284 reviews
Alaska Airlines
8.1
Very good
9,201 reviews
Check prices

Food

7.3

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Spirit Airlines
6.4
Okay
8,616 reviews
Alaska Airlines
8.1
Very good
9,201 reviews
Check prices

Food

7.3

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.3

Comfort

7.9

Reviews

1 / 10

Crew and airport staff were excellent. They accommodated my needs and were super professional and kind.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Idaho. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Idaho?

    For a flight from St. Louis to Idaho, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city.

  • Can I find flights from St. Louis to Idaho for under $200 on Cheapflights?

    Yes, there are multiple flights from St. Louis to Idaho for under $200. The cheapest flight booked recently is on Spirit Airlines for just $118, but on average you can expect to pay $283.

  • Are there last-minute flights available from St. Louis to Idaho for under $600?

    There are currently 9+ open flights from St. Louis to Idaho within the next 7 days for less than $600.

  • What are the cheapest airlines to fly from St. Louis to Idaho one-way?

    The cheapest airlines for a one-way flight from St. Louis to Idaho are Spirit Airlines ($97), Delta ($163), and American Airlines ($182).

  • What are the most popular routes from St. Louis to Idaho?

    The most popular route from St. Louis to Idaho is Lambert-St Louis - Jackson Hole. You may also consider Lambert-St Louis - Spokane or Lambert-St Louis - Boise Air Term. Gowen Fld.

  • What does STL to BOI mean?

    STL and BOI are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. STL to BOI refers to a flight route from Lambert-St Louis Airport to Boise Air Term. Gowen Fld Airport. Idaho Falls Fanning Field Airport (IDA), Hailey Sun Valley-Friedman Airport (SUN), Lewiston Nez Perce Rgnl Airport (LWS), Twin Falls Joslin Airport (TWF), Pocatello Airport (PIH) are other airports near this flight route and their unique identifiers/IATA codes.

  • Can I find deals for flights from St. Louis to Idaho that include extra baggage allowance?

    The amount of baggage you can bring on your St. Louis to Idaho flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from St. Louis to Idaho with specific airlines?

    Yes, Cheapflights allows you to browse and filter St. Louis to Idaho flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from St. Louis to Idaho that include hotel bookings?

    Yes. In addition to deals on St. Louis to Idaho flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Idaho?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Idaho.

  • Can I find deals for business class flights from St. Louis to Idaho?

    Yes. Cheapflights offers flight deals from St. Louis to Idaho by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from St. Louis to Idaho that allow pets onboard?

    Many airlines flying from St. Louis to Idaho offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from St. Louis to Idaho?

    Yes, you can often find last-minute deals on St. Louis to Idaho flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the St. Louis to Idaho flight deals updated?

    The St. Louis to Idaho flight deals you see on this page were last updated on 5/29.

  • What are the most popular airlines that fly from St. Louis to Idaho?

    When booking a flight from St. Louis to Idaho, you may want to consider flying on American Airlines, Alaska Airlines or Delta as they are the most popular for this route.

  • What is the cheapest month to book a flight from St. Louis to Idaho?

    Currently, December is the cheapest month in which you can book a flight from St. Louis to Idaho (average of $311). Flying from St. Louis to Idaho in June is currently the most expensive (average of $452). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for St. Louis to Idaho
See prices for flight routes from nearby airports that may be better suited for you.

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Top 5 airlines flying from St. Louis to Idaho

Discover the top 5 airlines that operate flights from St. Louis to Idaho. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,784,634 searches. Data last updated mayo 30, 2024.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$193Average$239FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
DeltaCheapest$296Average$612FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapest$304Average$388FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapest$316Average$654FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
American AirlinesCheapest$319Average$528FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
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Search flights from St. Louis to Idaho by cabin class

Find flights from St. Louis to Idaho, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
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