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Idaho Falls

$288+ Cheap flights from St. Louis to Idaho Falls (STL - IDA)

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 6/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — IDA
Apr 15 — Apr 221
Tue 4/15
Tue 4/22
1 adult, Economy
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Cheap flight deals from St. Louis to Idaho Falls

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Idaho Falls (IDA). 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 April 10, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$383
(American Airlines)

One-way from

$288
(Hawaiian Airlines)

Popular in

April

Cheapest in

January

Average price

$1,188
Provider with most accurate pricing for Lambert-St Louis-Idaho Falls Fanning Field flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Idaho Falls Fanning Field flights.
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From Lambert-St Louis to Idaho Falls Fanning Field
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One-way flight from Lambert-St Louis to Idaho Falls Fanning Field
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Highest demand for flights based on searches. 22% potential increase in price ($192 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($50 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Find flight deals from St. Louis to Idaho Falls

Cheapest flights from St. Louis to Idaho Falls
Explore the most affordable flight options available from St. Louis to Idaho Falls. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 10, 2025.

This American Airlines deal was found by Cheapflights users on 4/9. 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.
Fri 5/22:24 pmSTL - IDA
1 stop8h 46mAmerican Airlines
Fri 5/91:02 pmIDA - STL
1 stop5h 27mAmerican Airlines
Deal found 4/9$383
This Delta deal was found by Cheapflights users on 4/9. 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 5/27:40 amSTL - IDA
1 stop5h 46mDelta
Fri 5/912:30 pmIDA - STL
2 stops9h 56mDelta
Deal found 4/9$529
This Alaska Airlines deal was found by Cheapflights users on 4/9. 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.
Sun 9/77:36 pmSTL - IDA
1 stop28h 03mAlaska Airlines
Mon 9/154:03 pmIDA - STL
1 stop6h 56mAlaska Airlines
Deal found 4/9$556
This United deal was found by Cheapflights users on 4/9. 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 5/25:29 pmSTL - IDA
2 stops17h 03mUnited Airlines
Fri 5/94:22 pmIDA - STL
2 stops22h 25mUnited Airlines
Deal found 4/9$563
This Hawaiian Airlines deal was found by Cheapflights users on 4/9. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/53:03 pmSTL - IDA
1 stop8h 31mHawaiian Airlines
Mon 6/94:20 pmIDA - STL
1 stop6h 44mHawaiian Airlines
Deal found 4/9$640

Cheapflights Fare Finder

Customize your flight search to find flights from St. Louis to Idaho Falls 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 April 10, 2025.
Use the filters below to find and compare flights from St. Louis to Idaho Falls that are best for you.

Fly from

St. Louis

Fly to

Idaho Falls

Route

Depart

Return

Price

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Fri 5/2

2:24 pm-10:10 pm

1 stop8h 46m

Idaho Falls Fanning Field

Fri 5/9

1:02 pm-7:29 pm

1 stop5h 27m

$383

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Fri 5/2

7:40 am-12:26 pm

1 stop5h 46m

Idaho Falls Fanning Field

Fri 5/9

12:30 pm-11:26 pm

2 stops9h 56m

$529

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Sun 9/7

7:36 pm-10:39 pm

1 stop28h 03m

Idaho Falls Fanning Field

Mon 9/15

4:03 pm-11:59 pm

1 stop6h 56m

$556

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Fri 5/2

5:29 pm-9:32 am

2 stops17h 03m

Idaho Falls Fanning Field

Fri 5/9

4:22 pm-3:47 pm

2 stops22h 25m

$563

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 6/5

3:03 pm-10:34 pm

1 stop8h 31m

Idaho Falls Fanning Field

Mon 6/9

4:20 pm-12:04 am

1 stop6h 44m

$640

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 6/5

3:03 pm-10:34 pm

1 stop8h 31m

$288

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 6/5

2:15 pm-10:51 pm

2 stops9h 36m

$365

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 6/5

7:20 am-1:21 pm

3 stops31h 01m

$586

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/9

Compare providers for flights from St. Louis to Idaho Falls

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Idaho Falls in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on St. Louis-Idaho Falls flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Idaho Falls flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Idaho Falls flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on St. Louis-Idaho Falls flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Idaho Falls flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

Have a flexible travel schedule? Discover the best time to fly to Idaho Falls 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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Idaho Falls

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

Currently, October is the cheapest month in which you can book a flight from St. Louis to Idaho Falls (average of $380). Flying from St. Louis to Idaho Falls in July is currently the most expensive (average of $628). 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.

Rainfall in Idaho Falls by month

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

In terms of precipitation, rainfall in Idaho Falls ranges from 0.6 - 2.0 inches per month. May is typically the wettest month, when rainfall can reach 2.0 in. July is typically the driest time to visit Idaho Falls when rainfall is around 0.6 in.

Temperature in Idaho Falls by month

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

If weather is an important factor for your trip to Idaho Falls, 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 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Idaho Falls

Get insights into the airlines that provide service to Idaho Falls. 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 Falls. Reviews last updated April 10, 2025.
Alaska Airlines
8.0
Very good
9,848 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,848 reviews
Alaska Airlines
8.0
Very good
9,848 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,907 reviews
Alaska Airlines
8.0
Very good
9,848 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Hawaiian Airlines
7.9
Good
2,362 reviews
Alaska Airlines
8.0
Very good
9,848 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,634 reviews
Alaska Airlines
8.0
Very good
9,848 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,848 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Entertainment

7.1

Food

7.1

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Related info for your journey

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

  • What are the cheapest airlines flying from St. Louis to Idaho Falls round-trip?

    American Airlines, at $383, was found to be the cheapest airline from St. Louis to Idaho Falls.Alternate airlines to your destination round-trip include Delta and Alaska Airlines. American Airlines is priced at 40% lower than the current average price of a flight leaving 3 months from now.

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

    To fly one-way, consider booking your trip with Hawaiian Airlines, which is currently one of the cheapest options available, starting at $288. Delta flights start at $365 while deals on United Airlines start at $586 one-way.

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

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

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

    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 Falls.

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

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

    Currently, October is the cheapest month in which you can book a flight from St. Louis to Idaho Falls (average of $380). Flying from St. Louis to Idaho Falls in July is currently the most expensive (average of $628). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
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Top 3 airlines flying from St. Louis to Idaho Falls

Discover the top 3 airlines that operate flights from St. Louis to Idaho Falls. 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 April 10, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$305Average$653FlexibilityNo cancel feeOn-time71%
DeltaCheapest$314Average$633FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$464Average$673FlexibilityNo cancel feeOn-time69%

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