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St. Louis

$260+ 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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — STL
Dec 24 — Dec 311
Tue 12/24
Tue 12/31
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 December 19, 2024.

Round-trip from

$296
(Delta)

One-way from

$260
(United Airlines)
From Idaho to Lambert-St Louis
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One-way flight from Idaho to Lambert-St Louis
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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 December 19, 2024.

This Delta deal was found by Cheapflights users on 12/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/207:00 amJAC - STL
1 stop5h 19mDelta
Fri 1/36:00 amSTL - JAC
1 stop8h 09mDelta
Deal found 12/18$675
This United deal was found by Cheapflights users on 12/18. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/2012:37 pmJAC - STL
1 stop8h 08mUnited Airlines
Mon 12/308:35 amSTL - JAC
1 stop7h 48mUnited Airlines
Deal found 12/18$841
This American Airlines deal was found by Cheapflights users on 12/18. 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.
Thu 12/191:23 pmBOI - STL
1 stop7h 58mAmerican Airlines
Sun 12/297:24 amSTL - BOI
1 stop6h 59mAmerican Airlines
Deal found 12/18$1,056
This Alaska Airlines deal was found by Cheapflights users on 12/18. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/197:00 amBOI - STL
2 stops11h 30mAlaska Airlines
Sun 12/297:24 amSTL - BOI
2 stops13h 47mAlaska Airlines
Deal found 12/18$1,086
This United deal was found by Cheapflights users on 12/18. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/195:00 amBOI - STL
2 stops9h 47mUnited Airlines
Sun 12/294:43 pmSTL - BOI
1 stop7h 30mUnited Airlines
Deal found 12/18$1,131

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 December 19, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Thu 1/16

1:15 pm-9:33 pm

1 stop6h 18m

Lambert-St Louis

Mon 1/20

5:36 pm-10:51 pm

1 stop7h 15m

$296

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 4/24

1:15 pm-11:56 pm

1 stop9h 41m

Lambert-St Louis

Tue 4/29

2:55 pm-10:20 pm

1 stop8h 25m

$310

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 2/12

9:25 am-9:33 pm

2 stops11h 08m

Lambert-St Louis

Tue 2/18

10:22 am-10:11 pm

2 stops12h 49m

$313

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 1/16

2:32 pm-8:43 pm

1 stop5h 11m

Lambert-St Louis

Wed 1/22

7:00 am-4:27 pm

1 stop10h 27m

$325

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 1/9

2:07 pm-12:06 am

1 stop8h 59m

Lambert-St Louis

Sat 1/11

1:45 pm-9:52 pm

1 stop9h 07m

$350

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Fri 1/24

6:00 am-11:59 pm

1 stop15h 59m

Lambert-St Louis

Sun 1/26

7:00 am-11:07 pm

2 stops18h 07m

$350

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Tue 1/14

5:10 am-12:48 pm

1 stop5h 38m

Lambert-St Louis

Tue 1/21

4:36 pm-8:53 pm

1 stop6h 17m

$376

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 1/9

5:15 am-12:55 pm

1 stop6h 40m

Lambert-St Louis

Sat 1/11

6:25 am-2:10 pm

2 stops8h 45m

$407

JacksonSt. Louis

JAC - STL

JACSTL

Jackson Hole

Tue 6/10

7:45 am-2:18 pm

1 stop5h 33m

Lambert-St Louis

Tue 6/10

4:30 pm-9:02 pm

1 stop5h 32m

$427

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Thu 6/5

4:00 pm-11:56 pm

1 stop6h 56m

Lambert-St Louis

Sun 6/8

2:55 pm-10:38 pm

1 stop8h 43m

$576

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Showing 1-10 of 16 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 December 19, 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 December 19, 2024.
Peruse reviews from past customers who have flown with Delta, Alaska Airlines and United Airlines 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
4,836 reviews

Comfort

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,836 reviews
Southwest
8.1
Very good
4,836 reviews

Comfort

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,552 reviews
Southwest
8.1
Very good
4,836 reviews

Comfort

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,600 reviews
Southwest
8.1
Very good
4,836 reviews

Comfort

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
9,048 reviews
Southwest
8.1
Very good
4,836 reviews

Comfort

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,836 reviews

Comfort

8.1

Crew

8.7

Entertainment

7.7

Food

7.2

Overall

8.1

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 United Airlines, which is currently one of the cheapest options available, starting at $260. Delta flights start at $355 while deals on Alaska Airlines start at $723 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.

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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 2,558,603 searches. Data last updated December 19, 2024.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$291Average$555FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$304Average$441FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$320Average$665FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$380Average$486FlexibilityNo cancel feeOn-time63%
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