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$147+ Cheap flights from Idaho to St. Louis (STL)

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 2/8. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — STL
Nov 25 — Dec 21
Mon 11/25
Mon 12/2
1 adult, Economy
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Cheap flight deals from Idaho to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Idaho (USID) to St. Louis (STL). 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 Idaho to St. Louis

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

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.
Thu 12/125:15 amGEG - STL
1 stop5h 28mUnited Airlines
Tue 12/174:31 pmSTL - GEG
1 stop6h 26mUnited Airlines
Deal found 11/19$334
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.
Wed 12/112:00 pmBOI - STL
2 stops9h 57mDelta
Sat 12/147:20 amSTL - BOI
1 stop5h 50mDelta
Deal found 11/19$350
This American Airlines deal was found by Cheapflights users on 11/18. 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.
Wed 12/112:16 pmBOI - STL
1 stop8h 38mAmerican Airlines
Sat 12/147:20 amSTL - BOI
1 stop7h 11mAmerican Airlines
Deal found 11/18$358
This United Airlines deal was found by Cheapflights users on 11/18. 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 12/116:53 pmBOI - STL
2 stops14h 34mUnited Airlines
Sat 12/146:30 amSTL - BOI
1 stop6h 43mUnited Airlines
Deal found 11/18$385
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.
Mon 12/165:30 amLWS - STL
1 stop5h 13mUnited Airlines
Sat 1/44:43 pmSTL - LWS
1 stop7h 47mUnited Airlines
Deal found 11/19$388
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.
Tue 12/172:40 pmGEG - STL
2 stops8h 17mDelta
Thu 12/196:04 pmSTL - GEG
1 stop7h 07mDelta
Deal found 11/19$400
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.
Sun 12/154:55 pmBOI - STL
1 stop6h 30mSouthwest
Tue 12/312:40 pmSTL - BOI
2 stops9h 20mSouthwest
Deal found 11/19$425
This Mytrip deal was found by Cheapflights users on 11/18. 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.
Mon 12/211:51 amBOI - STL
3 stops27h 35mMultiple Airlines
Fri 12/61:00 pmSTL - BOI
3 stops26h 50mMultiple Airlines
Deal found 11/18$466
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/127:00 amGEG - STL
2 stops14h 59mAlaska Airlines
Tue 12/177:00 amSTL - GEG
2 stops17h 44mAlaska Airlines
Deal found 11/19$480
This Southwest deal was found by Cheapflights users on 11/18. 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.
Fri 12/61:30 pmGEG - STL
1 stop6h 15mSouthwest
Sun 12/87:45 amSTL - GEG
1 stop5h 35mSouthwest
Deal found 11/18$502
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.
Mon 11/251:32 pmGEG - STL
1 stop7h 06mAmerican Airlines
Wed 11/277:30 amSTL - GEG
1 stop8h 18mAmerican Airlines
Deal found 11/19$561
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.
Mon 11/255:50 pmJAC - STL
1 stop5h 52mDelta
Mon 12/92:25 pmSTL - JAC
1 stop7h 46mDelta
Deal found 11/19$567

Find flights from Idaho to St. Louis within your budget

Customize your flight search to find flights from Idaho to St. Louis 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

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Thu 12/12

5:15 am-12:43 pm

1 stop5h 28m

Lambert-St Louis

Tue 12/17

4:31 pm-8:57 pm

1 stop6h 26m

$334

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 12/11

2:00 pm-12:57 am

2 stops9h 57m

Lambert-St Louis

Sun 12/15

7:15 pm-11:45 pm

1 stop5h 30m

$350

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 12/11

2:16 pm-11:54 pm

1 stop8h 38m

Lambert-St Louis

Sat 12/14

7:20 am-1:31 pm

1 stop7h 11m

$358

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 12/11

6:53 pm-10:27 am

2 stops14h 34m

Lambert-St Louis

Sat 12/14

6:30 am-12:13 pm

1 stop6h 43m

$385

LewistonSt. Louis

LWS - STL

LWSSTL

Lewiston Nez Perce Rgnl

Mon 12/16

5:30 am-12:43 pm

1 stop5h 13m

Lambert-St Louis

Sat 1/4

4:43 pm-10:30 pm

1 stop7h 47m

$388

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Thu 1/16

5:27 am-4:23 pm

1 stop8h 56m

Lambert-St Louis

Mon 1/20

1:40 pm-9:12 pm

1 stop9h 32m

$396

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Tue 12/17

2:40 pm-12:57 am

2 stops8h 17m

Lambert-St Louis

Thu 12/19

6:04 pm-11:11 pm

1 stop7h 07m

$400

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 5/9

11:40 am-12:50 am

2 stops12h 10m

Lambert-St Louis

Tue 5/13

10:25 am-6:20 pm

2 stops8h 55m

$416

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 12/2

11:51 am-4:26 pm

3 stops27h 35m

Lambert-St Louis

Fri 12/6

1:00 pm-2:50 pm

3 stops26h 50m

$466

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 5/7

2:45 pm-11:56 pm

1 stop8h 11m

Lambert-St Louis

Sat 5/10

7:00 am-1:45 pm

1 stop7h 45m

$476

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/20

Showing 1-10 of 27 results
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Best time to book a flight from Idaho to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Idaho 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 Idaho to St. Louis

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

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

Currently, September is the cheapest month in which you can book a flight from Idaho to St. Louis (average of $308). Flying from Idaho to St. Louis in March is currently the most expensive (average of $357). 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 ID to STL?

Find hourly flight availability from Idaho to St. Louis. 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.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to St. Louis as you normally would.

Rainfall in St. Louis by month

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

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

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

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated November 20, 2024.
Peruse reviews from past customers who have flown with American Airlines, United Airlines and Southwest from Idaho to St. Louis to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
5,014 reviews

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Food

7.2

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

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Food

7.2

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

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Food

7.2

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

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Food

7.2

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

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Food

7.2

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

Boarding

8.2

Overall

8.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Food

7.2

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 Idaho to St. Louis. 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 into for flights to St. Louis from Idaho?

    Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to St. Louis from Idaho.

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

    To fly one-way, consider booking your trip with Delta, which is currently one of the cheapest options available, starting at $147. Alaska Airlines flights start at $158 while deals on American Airlines start at $173 one-way.

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

    When deciding which route to take from Idaho to St. Louis consider Idaho Falls Fanning Field - Lambert-St Louis, Boise Air Term. Gowen Fld - Lambert-St Louis or Jackson Hole - Lambert-St Louis as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Idaho to St. Louis 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 Idaho to St. Louis?

    Currently, September is the cheapest month in which you can book a flight from Idaho to St. Louis (average of $308). Flying from Idaho to St. Louis in March is currently the most expensive (average of $357). 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 Idaho to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Idaho to St. Louis

Discover the top 4 airlines that operate flights from Idaho to St. Louis. 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
American AirlinesCheapest$286Average$434FlexibilityNo cancel feeOn-time71%
DeltaCheapest$297Average$558FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$320Average$661FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$380Average$526FlexibilityNo cancel feeOn-time63%
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