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Idaho Falls

$183+ 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 8/1. Fares are subject to change and may not be available on all flights or dates of travel.
STL — IDA
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$436
(Delta)

One-way from

$183
(Mytrip)

Popular in

December

Cheapest in

January

Average price

$355
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. 9% potential increase in price ($57 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in June 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 junio 12, 2025.

This Delta deal was found by Cheapflights users on 6/11. 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.
mié. 12/247:10 amSTL - IDA
1 stop6h 08mDelta
mar. 12/306:00 amIDA - STL
1 stop6h 16mDelta
Deal found 6/11$368
This United Airlines deal was found by Cheapflights users on 6/11. 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.
jue. 6/265:15 amSTL - IDA
1 stop5h 29mUnited Airlines
lun. 6/306:03 pmIDA - STL
1 stop4h 56mUnited Airlines
Deal found 6/11$491
This Alaska Airlines deal was found by Cheapflights users on 6/12. 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.
jue. 6/123:24 pmSTL - IDA
1 stop8h 15mAlaska Airlines
sáb. 6/144:03 pmIDA - STL
1 stop6h 56mAlaska Airlines
Deal found 6/12$710
This American Airlines deal was found by Cheapflights users on 6/10. 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.
vie. 6/277:20 amSTL - IDA
2 stops15h 15mAmerican Airlines
dom. 6/297:00 amIDA - STL
2 stops12h 30mAmerican Airlines
Deal found 6/10$1,032

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 junio 12, 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

vie. 6/27

7:15 pm-10:55 pm

1 stop4h 40m

Idaho Falls Fanning Field

mar. 7/1

6:52 pm-12:43 am

1 stop4h 51m

$436

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

jue. 6/26

5:15 am-9:44 am

1 stop5h 29m

Idaho Falls Fanning Field

lun. 6/30

6:03 pm-11:59 pm

1 stop4h 56m

$491

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

jue. 7/3

7:32 pm-3:22 pm

1 stop20h 50m

Idaho Falls Fanning Field

dom. 7/6

6:15 am-11:59 pm

1 stop16h 44m

$807

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

vie. 6/27

7:20 am-9:35 pm

2 stops15h 15m

Idaho Falls Fanning Field

dom. 6/29

7:00 am-8:30 pm

2 stops12h 30m

$1,032

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

vie. 8/1

10:47 am-8:44 pm

2 stops34h 57m

$183

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

vie. 8/1

7:32 pm-10:39 pm

1 stop28h 07m

$304

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

vie. 8/1

8:54 am-5:22 pm

1 stop9h 28m

$357

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

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 December is currently the most expensive (average of $578). 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 junio 12, 2025.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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?

    Delta, at $436, was found to be the cheapest airline from St. Louis to Idaho Falls.Alternate airlines to your destination round-trip include United Airlines and Alaska Airlines. Delta is priced at 23% lower than the current average price of a flight leaving 3 months from now.

  • 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 December is currently the most expensive (average of $578). 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
Rexburg

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Alternative routes for St. Louis to Idaho Falls

See prices for flight routes from nearby airports that may be better suited for you.
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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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$298Average$576FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$305Average$645FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$400Average$658FlexibilityNo cancel feeOn-time69%

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