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Cheap flights from Idaho Falls to St. Louis from $160

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Idaho Falls to St. Louis departing on 11/19. 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 Idaho Falls to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:19 pm - 12:12 pmIDA-STL
22h 53m1 stop
Multiple Airlines Logo
7:43 pm - 2:36 pmSTL-IDA
43h 53m2 stops
$281Multiple Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
Alaska Airlines Logo
5:07 pm - 2:27 pmIDA-STL
20h 20m1 stop
Alaska Airlines Logo
7:00 am - 4:27 pmSTL-IDA
10h 27m1 stop
$371Alaska Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
Delta Logo
7:06 pm - 8:24 amIDA-STL
12h 18m2 stops
Delta Logo
6:15 am - 12:37 pmSTL-IDA
7h 22m1 stop
$393Delta
Find Deal
Wed, Dec 3 - Wed, Dec 10
Delta Logo
7:06 pm - 8:24 amIDA-STL
12h 18m2 stops
Delta Logo
2:38 pm - 10:21 pmSTL-IDA
8h 43m2 stops
$425Delta
Find Deal
Wed, Dec 3 - Wed, Dec 10
United Airlines Logo
4:15 pm - 9:54 pmIDA-STL
4h 39m1 stop
United Airlines Logo
9:00 am - 1:35 pmSTL-IDA
5h 35m1 stop
$451United Airlines
Find Deal
Wed, Nov 12 - Sun, Nov 16
American Airlines Logo
7:00 am - 11:57 pmIDA-STL
15h 57m2 stops
American Airlines Logo
7:00 am - 1:27 pmSTL-IDA
7h 27m1 stop
$453American Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
Multiple Airlines Logo
9:43 pm - 9:09 pmIDA-STL
22h 26m1 stop
Multiple Airlines Logo
3:53 pm - 1:32 pmSTL-IDA
22h 39m1 stop
$466Multiple Airlines
Find Deal
Mon, Nov 24 - Mon, Dec 1
Multiple Airlines Logo
5:22 pm - 10:02 amIDA-STL
39h 40m2 stops
Multiple Airlines Logo
3:53 pm - 1:32 pmSTL-IDA
22h 39m1 stop
$474Multiple Airlines
Find Deal
Mon, Nov 24 - Mon, Dec 1
American Airlines Logo
7:00 am - 11:57 pmIDA-STL
15h 57m2 stops
American Airlines Logo
10:13 am - 10:36 pmSTL-IDA
13h 23m2 stops
$562American Airlines
Find Deal
Wed, Dec 3 - Wed, Dec 10
United Airlines Logo
5:00 am - 4:27 pmIDA-STL
10h 27m2 stops
United Airlines Logo
6:00 am - 1:30 pmSTL-IDA
32h 30m3 stops
$656United Airlines
Find Deal
Sat, Dec 27 - Sat, Jan 17

Alaska Airlines flights from Idaho Falls to St. Louis

Our best Alaska Airlines deals on Idaho Falls to St. Louis flight tickets
Alaska Airlines
Dec 3
IDA5:07 pmIdaho Falls Fanning Field
20h 20m
1 stop
STL2:27 pmLambert-St Louis
Dec 10
STL7:00 amLambert-St Louis
10h 27m
1 stop
IDA4:27 pmIdaho Falls Fanning Field
$371
Find similar
Alaska Airlines
Nov 3
IDA3:50 pmIdaho Falls Fanning Field
7h 09m
1 stop
STL11:59 pmLambert-St Louis
Dec 4
STL7:00 amLambert-St Louis
17h 59m
1 stop
IDA11:59 pmIdaho Falls Fanning Field
$576
Find similar
Alaska Airlines
Nov 4
IDA6:05 amIdaho Falls Fanning Field
8h 13m
1 stop
STL3:18 pmLambert-St Louis
Dec 4
STL7:00 amLambert-St Louis
17h 59m
1 stop
IDA11:59 pmIdaho Falls Fanning Field
$601
Find similar

Delta flights from Idaho Falls to St. Louis

Our best Delta deals on Idaho Falls to St. Louis flight tickets
Delta
Dec 3
IDA7:06 pmIdaho Falls Fanning Field
12h 18m
2 stops
STL8:24 amLambert-St Louis
Dec 10
STL6:15 amLambert-St Louis
7h 22m
1 stop
IDA12:37 pmIdaho Falls Fanning Field
$393
Find similar
Delta
Dec 3
IDA7:06 pmIdaho Falls Fanning Field
12h 18m
2 stops
STL8:24 amLambert-St Louis
Dec 10
STL2:38 pmLambert-St Louis
8h 43m
2 stops
IDA10:21 pmIdaho Falls Fanning Field
$425
Find similar
Delta
Apr 7
IDA6:45 pmIdaho Falls Fanning Field
4h 52m
1 stop
STL12:37 amLambert-St Louis
Apr 8
STL10:00 amLambert-St Louis
13h 21m
2 stops
IDA10:21 pmIdaho Falls Fanning Field
$480
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Idaho Falls 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, momondo users made 832,500 searches. Data last updated October 30, 2025.
Use the filters below to find and compare flights from Idaho Falls to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Wed 12/3

12:19 pm-12:12 pm

1 stop22h 53m

Lambert-St Louis

Wed 12/10

7:43 pm-2:36 pm

2 stops43h 53m

$281

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Wed 12/3

5:07 pm-2:27 pm

1 stop20h 20m

Lambert-St Louis

Wed 12/10

7:00 am-4:27 pm

1 stop10h 27m

$371

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Wed 12/3

7:06 pm-8:24 am

2 stops12h 18m

Lambert-St Louis

Wed 12/10

6:15 am-12:37 pm

1 stop7h 22m

$393

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Wed 12/3

7:06 pm-8:24 am

2 stops12h 18m

Lambert-St Louis

Wed 12/10

2:38 pm-10:21 pm

2 stops8h 43m

$425

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Wed 11/12

4:15 pm-9:54 pm

1 stop4h 39m

Lambert-St Louis

Sun 11/16

9:00 am-1:35 pm

1 stop5h 35m

$451

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Wed 12/3

7:00 am-11:57 pm

2 stops15h 57m

Lambert-St Louis

Wed 12/10

7:00 am-1:27 pm

1 stop7h 27m

$453

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Mon 11/24

9:43 pm-9:09 pm

1 stop22h 26m

Lambert-St Louis

Mon 12/1

3:53 pm-1:32 pm

1 stop22h 39m

$466

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Mon 11/24

5:22 pm-10:02 am

2 stops39h 40m

Lambert-St Louis

Mon 12/1

3:53 pm-1:32 pm

1 stop22h 39m

$474

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Wed 12/3

7:00 am-11:57 pm

2 stops15h 57m

Lambert-St Louis

Wed 12/10

10:13 am-10:36 pm

2 stops13h 23m

$562

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Sat 12/27

5:00 am-4:27 pm

2 stops10h 27m

Lambert-St Louis

Sat 1/17

6:00 am-1:30 pm

3 stops32h 30m

$656

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 St. Louis from

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

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 St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $631. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $811. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Idaho Falls in the evening is the least expensive time of day to depart. momondo users have found prices as low as $548 when looking at flights departing in the evening. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $704 per ticket.

When to book flights from Idaho Falls to St. Louis

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

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

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

Direct flights

None
There are no direct flights from Idaho Falls to St. Louis. There are no popular flight routes from Idaho Falls to St. Louis.
Search flight deals

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

    Lambert-St Louis is 1181.2 mi away from Idaho Falls Fanning Field. Flights usually cover this in 4h 39m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Idaho Falls Fanning Field Airport to Lambert-St Louis Airport are updated daily.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Idaho Falls Fanning Field Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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

Best airlines flying from Idaho Falls to St. Louis

Compare and see reviews for airlines that fly from Idaho Falls to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $324Free CancellationRating
7.2
11,035 reviews
Search American Airlines flights
United AirlinesPriceFrom $387Free CancellationRating
7.4
8,998 reviews
Search United Airlines flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
Eureka
Litchfield
Shrewsbury

Why use momondo?

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

Finding the right flight to St. Louis from Idaho Falls is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

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

Yes. All flights to St. Louis from Idaho Falls on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo helps you find the best flight between Idaho Falls and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes momondo offers price alerts on flights to St. Louis from Idaho Falls. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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