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$153+ 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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — STL
Feb 27 — Mar 61
Thu 2/27
Thu 3/6
1 adult, Economy
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Cheap flight deals from Idaho to St. Louis

Keep the following information in mind while searching for Idaho to St. Louis flight deals. Data was last updated February 22, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$227
(Delta)

One-way from

$153
(Alaska Airlines)

Popular in

January

Cheapest in

December

Average price

$398
Provider with most accurate pricing for Boise Air Term. Gowen Fld-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Lambert-St Louis flights.
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From Idaho to Lambert-St Louis
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One-way flight from Idaho to Lambert-St Louis
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Highest demand for flights based on searches. 9% potential increase in price ($52 potential increase over avg. RT price).
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Cheapest flight prices on average. 7% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in February 2025
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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 February 22, 2025.

This Delta deal was found by Cheapflights users on 2/21. 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 4/35:59 pmBOI - STL
1 stop5h 29mDelta
Wed 4/96:00 amSTL - BOI
1 stop7h 44mDelta
Deal found 2/21$227
This Delta deal was found by Cheapflights users on 2/21. 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.
Sun 4/205:00 amGEG - STL
2 stops11h 20mDelta
Wed 4/236:00 amSTL - GEG
2 stops8h 45mDelta
Deal found 2/21$286
This Delta deal was found by Cheapflights users on 2/20. 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.
Fri 4/255:55 pmJAC - STL
1 stop5h 47mDelta
Tue 4/297:40 amSTL - JAC
1 stop5h 39mDelta
Deal found 2/20$315
This Alaska Airlines deal was found by Cheapflights users on 2/21. 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.
Tue 3/252:47 pmBOI - STL
1 stop8h 12mAlaska Airlines
Fri 3/283:11 pmSTL - BOI
1 stop8h 30mAlaska Airlines
Deal found 2/21$328
This Southwest deal was found by Cheapflights users on 2/21. 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.
Mon 4/217:45 pmBOI - STL
2 stops14h 45mSouthwest
Fri 4/255:10 pmSTL - BOI
2 stops8h 40mSouthwest
Deal found 2/21$375
This United Airlines deal was found by Cheapflights users on 2/20. 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.
Tue 3/1810:35 amBOI - STL
1 stop4h 59mUnited Airlines
Wed 3/198:00 amSTL - BOI
2 stops14h 59mUnited Airlines
Deal found 2/20$395
This Alaska Airlines deal was found by Cheapflights users on 2/22. 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 11/68:00 amIDA - STL
1 stop14h 56mAlaska Airlines
Sun 11/92:55 pmSTL - IDA
1 stop8h 43mAlaska Airlines
Deal found 2/22$424
This United Airlines deal was found by Cheapflights users on 2/21. 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 4/57:00 amJAC - STL
2 stops7h 47mUnited Airlines
Mon 4/79:39 amSTL - JAC
2 stops12h 13mUnited Airlines
Deal found 2/21$433
This American Airlines deal was found by Cheapflights users on 2/21. 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.
Tue 7/112:17 pmGEG - STL
1 stop8h 10mAmerican Airlines
Tue 7/297:23 amSTL - GEG
1 stop7h 36mAmerican Airlines
Deal found 2/21$442
This Southwest deal was found by Cheapflights users on 2/21. 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.
Mon 3/242:55 pmGEG - STL
2 stops8h 05mSouthwest
Tue 3/256:45 amSTL - GEG
1 stop5h 50mSouthwest
Deal found 2/21$452
This Alaska Airlines deal was found by Cheapflights users on 2/21. 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.
Mon 3/247:00 amGEG - STL
1 stop14h 59mAlaska Airlines
Tue 3/256:44 amSTL - GEG
1 stop7h 50mAlaska Airlines
Deal found 2/21$456
This Mytrip deal was found by Cheapflights users on 2/21. 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.
Sun 4/209:35 amGEG - STL
3 stops32h 35mMultiple Airlines
Wed 4/2312:15 pmSTL - GEG
3 stops34h 08mMultiple Airlines
Deal found 2/21$552

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 2,558,603 searches. Data last updated February 22, 2025.

Fly from

Idaho

Fly to

St. Louis

Route

Depart

Return

Price

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 4/3

5:59 pm-12:28 am

1 stop5h 29m

Lambert-St Louis

Wed 4/9

6:00 am-12:44 pm

1 stop7h 44m

$227

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Sun 4/20

5:00 am-6:20 pm

2 stops11h 20m

Lambert-St Louis

Wed 4/23

6:00 am-12:45 pm

2 stops8h 45m

$286

JacksonSt. Louis

JAC - STL

JACSTL

Jackson Hole

Fri 4/25

5:55 pm-12:42 am

1 stop5h 47m

Lambert-St Louis

Tue 4/29

7:40 am-12:19 pm

1 stop5h 39m

$315

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 3/25

2:47 pm-11:59 pm

1 stop8h 12m

Lambert-St Louis

Fri 3/28

3:11 pm-10:41 pm

1 stop8h 30m

$328

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 4/21

7:45 pm-11:30 am

2 stops14h 45m

Lambert-St Louis

Fri 4/25

5:10 pm-12:50 am

2 stops8h 40m

$375

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 3/18

10:35 am-4:34 pm

1 stop4h 59m

Lambert-St Louis

Wed 3/19

8:00 am-9:59 pm

2 stops14h 59m

$395

JacksonSt. Louis

JAC - STL

JACSTL

Jackson Hole

Sat 4/5

7:00 am-3:47 pm

2 stops7h 47m

Lambert-St Louis

Mon 4/7

9:39 am-8:52 pm

2 stops12h 13m

$433

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Tue 7/1

12:17 pm-10:27 pm

1 stop8h 10m

Lambert-St Louis

Tue 7/29

7:23 am-12:59 pm

1 stop7h 36m

$442

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Mon 3/24

2:55 pm-1:00 am

2 stops8h 05m

Lambert-St Louis

Tue 3/25

6:45 am-10:35 am

1 stop5h 50m

$452

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Mon 3/24

7:00 am-11:59 pm

1 stop14h 59m

Lambert-St Louis

Tue 3/25

6:44 am-12:34 pm

1 stop7h 50m

$456

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/21

Showing 1-10 of 34 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, August is the cheapest month in which you can book a flight from Idaho to St. Louis (average of $311). Flying from Idaho to St. Louis in March is currently the most expensive (average of $356). 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 February 22, 2025.

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 February 22, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines and Delta 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
4,395 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Crew

8.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,395 reviews
Southwest
8.1
Very good
4,395 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Crew

8.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,700 reviews
Southwest
8.1
Very good
4,395 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Crew

8.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,203 reviews
Southwest
8.1
Very good
4,395 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Crew

8.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Hawaiian Airlines
7.9
Good
2,314 reviews
Southwest
8.1
Very good
4,395 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Crew

8.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,754 reviews
Southwest
8.1
Very good
4,395 reviews

Overall

8.1

Boarding

8.2

Entertainment

7.6

Crew

8.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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 Alaska Airlines, which is currently one of the cheapest options available, starting at $153. Delta flights start at $154 while deals on American Airlines start at $160 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 Spokane - Lambert-St Louis, Boise Air Term. Gowen Fld - Lambert-St Louis or Idaho Falls Fanning Field - 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, August is the cheapest month in which you can book a flight from Idaho to St. Louis (average of $311). Flying from Idaho to St. Louis in March is currently the most expensive (average of $356). 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

Traveling to a place near Idaho?

Book flights to Idaho if you plan to visit one of these locations
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Alton
Farmington
Chesterfield

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Alternative routes for Idaho to St. Louis

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Top 5 airlines flying from Idaho to St. Louis

Discover the top 5 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 2,558,603 searches. Data last updated February 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$288Average$592FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$304Average$417FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$334Average$648FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$351Average$446FlexibilityNo cancel feeOn-time63%
Alaska AirlinesCheapest$353Average$463FlexibilityNo cancel feeOn-time75%
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