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Cheap flights from St. Louis to Idaho Falls from $169

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Idaho Falls departing on 6/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to Idaho Falls

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
9:55 pm - 3:27 pm
STL
-
IDA
18h 32m
1 stop
Multiple Airlines Logo
10:21 pm - 6:50 am
IDA
-
STL
31h 29m
2 stops
$306Multiple Airlines
Thu, May 7 - Mon, May 11
United Airlines Logo
8:41 am - 1:30 pm
STL
-
IDA
5h 49m
1 stop
United Airlines Logo
5:33 pm - 11:21 pm
IDA
-
STL
4h 48m
1 stop
$341United Airlines
Tue, Mar 3 - Wed, Mar 4
United Airlines Logo
6:25 am - 1:30 pm
STL
-
IDA
8h 05m
2 stops
United Airlines Logo
2:40 pm - 11:21 pm
IDA
-
STL
7h 41m
1 stop
$346United Airlines
Tue, Mar 3 - Wed, Mar 4
United Airlines Logo
8:41 am - 1:30 pm
STL
-
IDA
5h 49m
1 stop
United Airlines Logo
10:45 am - 10:59 pm
IDA
-
STL
11h 14m
2 stops
$375United Airlines
Tue, Mar 3 - Wed, Mar 4
United Airlines Logo
6:25 am - 1:30 pm
STL
-
IDA
8h 05m
2 stops
United Airlines Logo
10:45 am - 10:59 pm
IDA
-
STL
11h 14m
2 stops
$380United Airlines
Tue, Mar 3 - Wed, Mar 4
Delta Logo
7:00 am - 12:22 pm
STL
-
IDA
6h 22m
1 stop
Delta Logo
6:35 pm - 12:25 am
IDA
-
STL
4h 50m
1 stop
$392Delta
Sun, Feb 15 - Wed, Feb 18
United Airlines Logo
6:25 am - 1:30 pm
STL
-
IDA
8h 05m
2 stops
United Airlines Logo
10:45 am - 10:59 pm
IDA
-
STL
11h 14m
2 stops
$409United Airlines
Tue, Mar 3 - Wed, Mar 4
Multiple Airlines Logo
9:55 pm - 3:27 pm
STL
-
IDA
18h 32m
1 stop
Multiple Airlines Logo
10:21 pm - 6:50 am
IDA
-
STL
31h 29m
2 stops
$415Multiple Airlines
Thu, May 7 - Mon, May 11
United Airlines Logo
6:25 am - 1:30 pm
STL
-
IDA
8h 05m
2 stops
United Airlines Logo
2:40 pm - 8:26 pm
IDA
-
STL
4h 46m
1 stop
$445United Airlines
Sun, Feb 15 - Wed, Feb 18
Delta Logo
7:00 am - 12:22 pm
STL
-
IDA
6h 22m
1 stop
Delta Logo
6:35 pm - 12:25 am
IDA
-
STL
4h 50m
1 stop
$484Delta
Fri, Feb 20 - Tue, Feb 24

American Airlines flights from St. Louis to Idaho Falls

Our best American Airlines deals on St. Louis to Idaho Falls flight tickets
American Airlines
Jul 17
STL7:15 amLambert-St Louis
6h 58m
1 stop
IDA1:13 pmIdaho Falls Fanning Field
Jul 24
IDA12:41 pmIdaho Falls Fanning Field
6h 45m
1 stop
STL8:26 pmLambert-St Louis
$531
American Airlines
Jul 27
STL7:15 amLambert-St Louis
6h 58m
1 stop
IDA1:13 pmIdaho Falls Fanning Field
Aug 1
IDA7:00 amIdaho Falls Fanning Field
15h 44m
1 stop
STL11:44 pmLambert-St Louis
$585
American Airlines
May 7
STL5:20 amLambert-St Louis
8h 53m
1 stop
IDA1:13 pmIdaho Falls Fanning Field
May 11
IDA7:48 amIdaho Falls Fanning Field
15h 08m
2 stops
STL11:56 pmLambert-St Louis
$604

United Airlines flights from St. Louis to Idaho Falls

Our best United Airlines deals on St. Louis to Idaho Falls flight tickets
United Airlines
Jul 23
STL5:15 amLambert-St Louis
5h 40m
1 stop
IDA9:55 amIdaho Falls Fanning Field
Jul 27
IDA6:03 pmIdaho Falls Fanning Field
4h 55m
1 stop
STL11:58 pmLambert-St Louis
$329
United Airlines
Jul 29
STL5:15 amLambert-St Louis
5h 40m
1 stop
IDA9:55 amIdaho Falls Fanning Field
Aug 5
IDA2:31 pmIdaho Falls Fanning Field
5h 11m
1 stop
STL8:42 pmLambert-St Louis
$339
United Airlines
Mar 3
STL8:41 amLambert-St Louis
5h 49m
1 stop
IDA1:30 pmIdaho Falls Fanning Field
Mar 4
IDA2:40 pmIdaho Falls Fanning Field
7h 41m
1 stop
STL11:21 pmLambert-St Louis
$341

momondo 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, momondo users made 832,500 searches. Data last updated February 7, 2026.
Use the filters below to find and compare flights from St. Louis to Idaho Falls that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 5/7

9:55 pm-3:27 pm

1 stop18h 32m

Idaho Falls Fanning Field

Mon 5/11

10:21 pm-6:50 am

2 stops31h 29m

$306

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

8:41 am-1:30 pm

1 stop5h 49m

Idaho Falls Fanning Field

Wed 3/4

5:33 pm-11:21 pm

1 stop4h 48m

$341

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

6:25 am-1:30 pm

2 stops8h 05m

Idaho Falls Fanning Field

Wed 3/4

2:40 pm-11:21 pm

1 stop7h 41m

$346

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

8:41 am-1:30 pm

1 stop5h 49m

Idaho Falls Fanning Field

Wed 3/4

10:45 am-10:59 pm

2 stops11h 14m

$375

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

6:25 am-1:30 pm

2 stops8h 05m

Idaho Falls Fanning Field

Wed 3/4

10:45 am-10:59 pm

2 stops11h 14m

$380

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Sun 2/15

7:00 am-12:22 pm

1 stop6h 22m

Idaho Falls Fanning Field

Wed 2/18

6:35 pm-12:25 am

1 stop4h 50m

$392

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

6:25 am-1:30 pm

2 stops8h 05m

Idaho Falls Fanning Field

Wed 3/4

10:45 am-10:59 pm

2 stops11h 14m

$409

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 5/7

9:55 pm-3:27 pm

1 stop18h 32m

Idaho Falls Fanning Field

Mon 5/11

10:21 pm-6:50 am

2 stops31h 29m

$415

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Sun 2/15

6:25 am-1:30 pm

2 stops8h 05m

Idaho Falls Fanning Field

Wed 2/18

2:40 pm-8:26 pm

1 stop4h 46m

$445

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Fri 2/20

7:00 am-12:22 pm

1 stop6h 22m

Idaho Falls Fanning Field

Tue 2/24

6:35 pm-12:25 am

1 stop4h 50m

$484

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest first
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See travel insights to Idaho Falls from

How to get the cheapest flight ticket from St. Louis to Idaho Falls

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Lambert-St Louis to Idaho Falls Fanning Field?

United Airlines is the most popular carrier operating from Lambert-St Louis to Idaho Falls Fanning Field

What airlines fly to Idaho Falls?

United Airlines, Delta and American Airlines are the top three most popular airlines that fly to Idaho Falls from St. Louis according to our data. United Airlines is the first choice among our users, with 48% of people opting to fly with this airline when traveling to Idaho Falls. Keep in mind that there are 3 different airlines that fly to Idaho Falls on a routine basis, so you have a few additional options to choose from.

When to book flights from St. Louis to Idaho Falls

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Idaho Falls according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Idaho Falls (STL to IDA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Idaho Falls

Fastest flight time

5h 28m

Direct flights

None
The fastest flight from St. Louis to Idaho Falls takes 5h 28m
There are no direct flights from St. Louis to Idaho Falls. There are no popular flight routes from St. Louis to Idaho Falls.
Search flight deals

  • How far is Lambert-St Louis to Idaho Falls Fanning Field by plane?

    The straight-line distance from Lambert-St Louis to Idaho Falls Fanning Field is 1181.2 mi. 5h 28m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Idaho Falls Fanning Field Airport?

    Prices for flights from Lambert-St Louis Airport to Idaho Falls Fanning Field Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Idaho Falls Fanning Field Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Idaho Falls Fanning Field Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Idaho Falls Fanning Field Airport.

  • What documentation or ID do you need to fly to Idaho Falls Fanning Field Airport?

    The travel and health documents required for your trip to Idaho Falls Fanning Field Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Idaho Falls Fanning Field Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from St. Louis to Idaho Falls?

Best airlines flying from St. Louis to Idaho Falls

Compare and see reviews for airlines that fly from St. Louis to Idaho Falls with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $163Free CancellationRating
7.9
8,162 reviews
Search Delta flights
United AirlinesPriceFrom $355Free CancellationRating
7.4
9,245 reviews
Search United Airlines flights

Traveling to a place near Idaho Falls?

Book flights to Idaho Falls if you plan to visit one of these locations
Rexburg

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Idaho Falls?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Idaho Falls. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Idaho Falls with flexible booking policies on momondo?

momondo does allow users to show only those flights to Idaho Falls from St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from St. Louis to Idaho Falls?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Idaho Falls.

I’m not ready to book a flight from St. Louis to Idaho Falls right now. Can momondo alert me if prices change?

Yes. momondo can track prices for St. Louis to Idaho Falls flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

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