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Cheap flights from St. Louis to Idaho Falls from $224

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 11/17. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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.
Hawaiian Airlines Logo
7:00 am - 3:23 pmSTL-IDA
9h 23m1 stop
Hawaiian Airlines Logo
4:00 pm - 11:56 pmIDA-STL
6h 56m1 stop
$367Hawaiian Airlines
Find Deal
Tue, Mar 3 - Wed, Mar 4
Hawaiian Airlines Logo
7:00 am - 3:23 pmSTL-IDA
9h 23m1 stop
Hawaiian Airlines Logo
4:00 pm - 11:56 pmIDA-STL
6h 56m1 stop
$371Hawaiian Airlines
Find Deal
Tue, Mar 3 - Wed, Mar 4
Delta Logo
10:13 am - 10:21 pmSTL-IDA
13h 08m2 stops
Delta Logo
6:28 pm - 12:24 amIDA-STL
4h 56m1 stop
$393Delta
Find Deal
Tue, Mar 3 - Wed, Mar 4
Delta Logo
10:13 am - 10:21 pmSTL-IDA
13h 08m2 stops
Delta Logo
6:28 pm - 9:08 amIDA-STL
13h 40m2 stops
$398Delta
Find Deal
Tue, Mar 3 - Wed, Mar 4
Delta Logo
10:13 am - 10:21 pmSTL-IDA
13h 08m2 stops
Delta Logo
6:28 pm - 9:08 amIDA-STL
13h 40m2 stops
$421Delta
Find Deal
Tue, Mar 3 - Wed, Mar 4
United Airlines Logo
8:41 am - 1:30 pmSTL-IDA
5h 49m1 stop
United Airlines Logo
10:45 am - 10:59 pmIDA-STL
11h 14m2 stops
$456United Airlines
Find Deal
Tue, Mar 3 - Wed, Mar 4
United Airlines Logo
6:30 am - 1:30 pmSTL-IDA
8h 00m2 stops
United Airlines Logo
10:45 am - 10:00 pmIDA-STL
10h 15m2 stops
$461United Airlines
Find Deal
Tue, Mar 3 - Wed, Mar 4
Alaska Airlines Logo
2:50 pm - 6:18 pmSTL-IDA
28h 28m1 stop
Alaska Airlines Logo
9:00 am - 1:54 pmIDA-STL
27h 54m1 stop
$495Alaska Airlines
Find Deal
Fri, Jan 16 - Mon, Jan 19
Alaska Airlines Logo
2:50 pm - 6:18 pmSTL-IDA
28h 28m1 stop
Alaska Airlines Logo
9:00 am - 1:54 pmIDA-STL
27h 54m1 stop
$505Alaska Airlines
Find Deal
Fri, Jan 16 - Mon, Jan 19
United Airlines Logo
6:00 pm - 9:56 amSTL-IDA
16h 56m1 stop
United Airlines Logo
2:40 pm - 2:30 pmIDA-STL
22h 50m2 stops
$530United Airlines
Find Deal
Fri, Jan 16 - Mon, Jan 19

United Airlines flights from St. Louis to Idaho Falls

Our best United Airlines deals on St. Louis to Idaho Falls flight tickets
United Airlines
Mar 3
STL8:41 amLambert-St Louis
5h 49m
1 stop
IDA1:30 pmIdaho Falls Fanning Field
Mar 4
IDA10:45 amIdaho Falls Fanning Field
11h 14m
2 stops
STL10:59 pmLambert-St Louis
$456
Find similar
United Airlines
Mar 3
STL6:30 amLambert-St Louis
8h 00m
2 stops
IDA1:30 pmIdaho Falls Fanning Field
Mar 4
IDA10:45 amIdaho Falls Fanning Field
10h 15m
2 stops
STL10:00 pmLambert-St Louis
$461
Find similar
United Airlines
Jan 16
STL6:00 pmLambert-St Louis
16h 56m
1 stop
IDA9:56 amIdaho Falls Fanning Field
Jan 19
IDA2:40 pmIdaho Falls Fanning Field
22h 50m
2 stops
STL2:30 pmLambert-St Louis
$530
Find similar

Hawaiian Airlines flights from St. Louis to Idaho Falls

Our best Hawaiian Airlines deals on St. Louis to Idaho Falls flight tickets
Hawaiian Airlines
Mar 3
STL7:00 amLambert-St Louis
9h 23m
1 stop
IDA3:23 pmIdaho Falls Fanning Field
Mar 4
IDA4:00 pmIdaho Falls Fanning Field
6h 56m
1 stop
STL11:56 pmLambert-St Louis
$367
Find similar
Hawaiian Airlines
Mar 3
STL7:00 amLambert-St Louis
9h 23m
1 stop
IDA3:23 pmIdaho Falls Fanning Field
Mar 4
IDA4:00 pmIdaho Falls Fanning Field
6h 56m
1 stop
STL11:56 pmLambert-St Louis
$371
Find similar

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 November 4, 2025.
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

Tue 3/3

7:00 am-3:23 pm

1 stop9h 23m

Idaho Falls Fanning Field

Wed 3/4

4:00 pm-11:56 pm

1 stop6h 56m

$367

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

7:00 am-3:23 pm

1 stop9h 23m

Idaho Falls Fanning Field

Wed 3/4

4:00 pm-11:56 pm

1 stop6h 56m

$371

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

10:13 am-10:21 pm

2 stops13h 08m

Idaho Falls Fanning Field

Wed 3/4

6:28 pm-12:24 am

1 stop4h 56m

$393

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

10:13 am-10:21 pm

2 stops13h 08m

Idaho Falls Fanning Field

Wed 3/4

6:28 pm-9:08 am

2 stops13h 40m

$398

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

10:13 am-10:21 pm

2 stops13h 08m

Idaho Falls Fanning Field

Wed 3/4

6:28 pm-9:08 am

2 stops13h 40m

$421

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

$456

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 3/3

6:30 am-1:30 pm

2 stops8h 00m

Idaho Falls Fanning Field

Wed 3/4

10:45 am-10:00 pm

2 stops10h 15m

$461

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Fri 1/16

2:50 pm-6:18 pm

1 stop28h 28m

Idaho Falls Fanning Field

Mon 1/19

9:00 am-1:54 pm

1 stop27h 54m

$495

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Fri 1/16

2:50 pm-6:18 pm

1 stop28h 28m

Idaho Falls Fanning Field

Mon 1/19

9:00 am-1:54 pm

1 stop27h 54m

$505

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Fri 1/16

6:00 pm-9:56 am

1 stop16h 56m

Idaho Falls Fanning Field

Mon 1/19

2:40 pm-2:30 pm

2 stops22h 50m

$530

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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 day to depart on your flight to Idaho Falls?

Our data shows that Tuesday is the least expensive day to fly to Idaho Falls. Tickets to fly out on this day can be as low as $605. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to Idaho Falls on Monday is $787.

What is the cheapest time of day to depart on your flight to Idaho Falls?

Our most recent data shows that the best time of day to fly to Idaho Falls is at noon. Flights from St. Louis to Idaho Falls during this time can be as low as $651. Try not to purchase tickets in the afternoon because they tend to be around $685. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

Direct flights

None
There are no direct flights from St. Louis to Idaho Falls. There are no popular flight routes from St. Louis to Idaho Falls.
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  • 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 49m 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 $192Free CancellationRating
7.9
8,003 reviews
Search Delta flights
United AirlinesPriceFrom $400Free CancellationRating
7.4
9,002 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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