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$127+ Cheap flights from St. Louis (STL) to Idaho

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 12/16. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOI
Nov 25 — Dec 21
Mon 11/25
Mon 12/2
1 adult, Economy
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Cheap flight deals from St. Louis to Idaho

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Idaho (USID). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated November 20, 2024.

Find flight deals from St. Louis to Idaho

Cheapest flights from St. Louis to Idaho
Explore the most affordable flight options available from St. Louis to Idaho. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 20, 2024.

This Delta deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/187:20 amSTL - BOI
1 stop6h 00mDelta
Wed 12/255:32 amBOI - STL
1 stop8h 17mDelta
Deal found 11/20$300
This Delta deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/122:25 pmSTL - GEG
2 stops11h 41mDelta
Mon 12/165:00 amGEG - STL
2 stops10h 40mDelta
Deal found 11/19$303
This United Airlines deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/147:00 amSTL - JAC
1 stop8h 59mUnited Airlines
Tue 12/172:30 pmJAC - STL
1 stop5h 11mUnited Airlines
Deal found 11/19$304
This United Airlines deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/44:31 pmSTL - LWS
1 stop7h 59mUnited Airlines
Sun 12/85:30 amLWS - STL
1 stop5h 13mUnited Airlines
Deal found 11/19$308
This American Airlines deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/127:20 amSTL - GEG
1 stop8h 23mAmerican Airlines
Mon 12/163:21 pmGEG - STL
1 stop6h 33mAmerican Airlines
Deal found 11/19$316
This United Airlines deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/137:00 amSTL - BOI
1 stop10h 12mUnited Airlines
Sun 12/156:40 amBOI - STL
1 stop5h 03mUnited Airlines
Deal found 11/20$317
This American Airlines deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/167:20 amSTL - BOI
1 stop7h 11mAmerican Airlines
Thu 12/192:05 pmBOI - STL
1 stop9h 01mAmerican Airlines
Deal found 11/20$337
This Mytrip deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/512:00 pmSTL - IDA
3 stops24h 28mMultiple Airlines
Mon 12/96:25 pmIDA - STL
2 stops19h 56mMultiple Airlines
Deal found 11/19$399
This Mytrip deal was found by Cheapflights users on 11/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1312:15 pmSTL - BOI
3 stops27h 35mMultiple Airlines
Sun 12/1511:57 amBOI - STL
3 stops27h 28mMultiple Airlines
Deal found 11/20$405
This Southwest deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/186:05 amSTL - GEG
1 stop9h 35mSouthwest
Wed 12/256:50 amGEG - STL
2 stops8h 15mSouthwest
Deal found 11/19$421
This Southwest deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/266:30 amSTL - BOI
1 stop10h 00mSouthwest
Tue 12/311:55 amBOI - STL
1 stop7h 45mSouthwest
Deal found 11/19$466
This United Airlines deal was found by Cheapflights users on 11/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/48:30 amSTL - GEG
1 stop6h 17mUnited Airlines
Sun 12/85:15 amGEG - STL
1 stop5h 28mUnited Airlines
Deal found 11/19$506

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 2,629,791 searches. Data last updated November 20, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Sat 1/18

6:30 am-6:44 pm

2 stops14h 14m

Spokane

Sat 1/25

11:22 am-11:14 pm

2 stops9h 52m

$253

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 1/18

7:40 am-6:29 pm

2 stops11h 49m

Boise Air Term. Gowen Fld

Sat 1/25

10:40 am-9:33 pm

2 stops9h 53m

$253

St. LouisJackson

STL - JAC

STLJAC

Lambert-St Louis

Wed 1/15

7:40 am-12:15 pm

1 stop5h 35m

Jackson Hole

Tue 1/21

7:05 am-1:43 pm

1 stop5h 38m

$294

St. LouisJackson

STL - JAC

STLJAC

Lambert-St Louis

Sat 12/14

7:00 am-2:59 pm

1 stop8h 59m

Jackson Hole

Tue 12/17

2:30 pm-8:41 pm

1 stop5h 11m

$304

St. LouisLewiston

STL - LWS

STLLWS

Lambert-St Louis

Wed 12/4

4:31 pm-10:30 pm

1 stop7h 59m

Lewiston Nez Perce Rgnl

Sun 12/8

5:30 am-12:43 pm

1 stop5h 13m

$308

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Thu 12/12

7:20 am-1:43 pm

1 stop8h 23m

Spokane

Mon 12/16

3:21 pm-11:54 pm

1 stop6h 33m

$316

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 12/13

7:00 am-4:12 pm

1 stop10h 12m

Boise Air Term. Gowen Fld

Sun 12/15

6:40 am-12:43 pm

1 stop5h 03m

$317

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Wed 1/8

5:03 am-12:25 pm

1 stop8h 22m

Idaho Falls Fanning Field

Mon 1/13

12:55 pm-7:30 pm

1 stop5h 35m

$334

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Mon 12/16

7:20 am-1:31 pm

1 stop7h 11m

Boise Air Term. Gowen Fld

Thu 12/19

2:05 pm-12:06 am

1 stop9h 01m

$337

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Wed 2/26

7:00 am-12:44 pm

1 stop7h 44m

Spokane

Mon 3/3

7:35 pm-2:25 pm

1 stop16h 50m

$341

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

Showing 1-10 of 34 results
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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.

Travel insights for flights from St. Louis to Idaho

Get recent, data-driven insights about flights from St. Louis to Idaho including ideal travel times, pricing trends, and more.

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

Currently, January is the cheapest month in which you can book a flight from St. Louis to Idaho (average of $310). Flying from St. Louis to Idaho in June is currently the most expensive (average of $436). 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.

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

Find hourly flight availability from St. Louis to Idaho. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 20, 2024.

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.

Rainfall in Idaho by month

Plan your trip to Idaho by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Idaho ranges from 0.2 - 1.6 inches per month. December is typically the wettest month, when rainfall can reach 1.6 in. August is typically the driest time to visit Idaho when rainfall is around 0.2 in.

Temperature in Idaho by month

Plan your trip to Idaho by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Idaho, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 75.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 30.2 F).

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 November 20, 2024.
Read through reviews of airlines operating flights from St. Louis to Idaho, such as Delta, United Airlines and American Airlines. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Food

7.2

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
5,014 reviews
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Food

7.2

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,461 reviews
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Food

7.2

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,756 reviews
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Food

7.2

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
9,171 reviews
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Food

7.2

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
5,014 reviews

Overall

8.1

Entertainment

7.7

Comfort

8.1

Food

7.2

Boarding

8.2

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

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.

  • 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 Delta ($127), American Airlines ($157), and United Airlines ($187).

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

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

  • 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.

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

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Idaho (average of $310). Flying from St. Louis to Idaho in June is currently the most expensive (average of $436). 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 4 airlines flying from St. Louis to Idaho

Discover the top 4 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 2,629,791 searches. Data last updated November 20, 2024.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$258Average$568FlexibilityNo cancel feeOn-time69%
DeltaCheapest$296Average$535FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$334Average$602FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$367Average$533FlexibilityNo cancel feeOn-time63%
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