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Cheap flights from St. Louis to Idaho Falls from $190

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 5/29. 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.
Alaska Airlines Logo
4:40 pm - 10:54 pm
STL
-
IDA
7h 14m
1 stop
Alaska Airlines Logo
6:09 am - 3:44 pm
IDA
-
STL
8h 35m
1 stop
$319Alaska Airlines
Wed, Oct 28 - Sat, Oct 31
Alaska Airlines Logo
7:00 am - 3:35 pm
STL
-
IDA
9h 35m
1 stop
Alaska Airlines Logo
1:46 pm - 11:59 pm
IDA
-
STL
9h 13m
1 stop
$349Alaska Airlines
Wed, Oct 28 - Sat, Oct 31
Multiple Airlines Logo
3:34 pm - 4:00 pm
STL
-
IDA
25h 26m
2 stops
Multiple Airlines Logo
10:47 pm - 6:05 pm
IDA
-
STL
18h 18m
1 stop
$390Multiple Airlines
Thu, Jul 16 - Mon, Jul 20
Multiple Airlines Logo
7:03 pm - 4:08 pm
STL
-
IDA
22h 05m
2 stops
Multiple Airlines Logo
10:56 pm - 6:51 pm
IDA
-
STL
18h 55m
1 stop
$391Multiple Airlines
Thu, Jun 11 - Mon, Jun 15
United Airlines Logo
5:10 am - 9:50 am
STL
-
IDA
5h 40m
1 stop
United Airlines Logo
5:54 pm - 11:57 pm
IDA
-
STL
5h 03m
1 stop
$404United Airlines
Tue, May 26 - Sat, May 30
United Airlines Logo
5:10 am - 9:50 am
STL
-
IDA
5h 40m
1 stop
United Airlines Logo
5:54 pm - 11:57 pm
IDA
-
STL
5h 03m
1 stop
$416United Airlines
Sat, Jul 4 - Fri, Jul 10
United Airlines Logo
5:10 am - 9:50 am
STL
-
IDA
5h 40m
1 stop
United Airlines Logo
5:54 pm - 11:57 pm
IDA
-
STL
5h 03m
1 stop
$417United Airlines
Mon, May 25 - Sat, Jun 13
United Airlines Logo
5:10 am - 9:50 am
STL
-
IDA
5h 40m
1 stop
United Airlines Logo
4:10 pm - 11:57 pm
IDA
-
STL
6h 47m
1 stop
$420United Airlines
Thu, Jun 11 - Wed, Jun 17
Multiple Airlines Logo
6:41 pm - 11:50 am
STL
-
IDA
18h 09m
2 stops
Multiple Airlines Logo
6:21 pm - 11:51 am
IDA
-
STL
16h 30m
1 stop
$425Multiple Airlines
Thu, Sep 10 - Mon, Sep 14
American Airlines Logo
5:25 am - 12:14 pm
STL
-
IDA
7h 49m
1 stop
American Airlines Logo
2:08 pm - 9:42 pm
IDA
-
STL
6h 34m
1 stop
$430American Airlines
Mon, May 25 - Thu, May 28

United Airlines flights from St. Louis to Idaho Falls

Our best United Airlines deals on St. Louis to Idaho Falls flight tickets
United Airlines
May 26
STL5:10 amLambert-St Louis
5h 40m
1 stop
IDA9:50 amIdaho Falls Fanning Field
May 30
IDA5:54 pmIdaho Falls Fanning Field
5h 03m
1 stop
STL11:57 pmLambert-St Louis
$404
United Airlines
Jul 4
STL5:10 amLambert-St Louis
5h 40m
1 stop
IDA9:50 amIdaho Falls Fanning Field
Jul 10
IDA5:54 pmIdaho Falls Fanning Field
5h 03m
1 stop
STL11:57 pmLambert-St Louis
$416
United Airlines
May 25
STL5:10 amLambert-St Louis
5h 40m
1 stop
IDA9:50 amIdaho Falls Fanning Field
Jun 13
IDA5:54 pmIdaho Falls Fanning Field
5h 03m
1 stop
STL11:57 pmLambert-St Louis
$417

American Airlines flights from St. Louis to Idaho Falls

Our best American Airlines deals on St. Louis to Idaho Falls flight tickets
American Airlines
May 25
STL5:25 amLambert-St Louis
7h 49m
1 stop
IDA12:14 pmIdaho Falls Fanning Field
May 28
IDA2:08 pmIdaho Falls Fanning Field
6h 34m
1 stop
STL9:42 pmLambert-St Louis
$430
American Airlines
Aug 13
STL5:42 amLambert-St Louis
6h 48m
1 stop
IDA11:30 amIdaho Falls Fanning Field
Aug 23
IDA7:00 amIdaho Falls Fanning Field
6h 43m
1 stop
STL2:43 pmLambert-St Louis
$514
American Airlines
Aug 13
STL5:42 amLambert-St Louis
6h 48m
1 stop
IDA11:30 amIdaho Falls Fanning Field
Aug 23
IDA7:00 amIdaho Falls Fanning Field
6h 43m
1 stop
STL2:43 pmLambert-St Louis
$531

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 May 14, 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

Cheapest round-trip

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Wed 10/28

4:40 pm-10:54 pm

1 stop7h 14m

Idaho Falls Fanning Field

Sat 10/31

6:09 am-3:44 pm

1 stop8h 35m

$319

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Wed 10/28

7:00 am-3:35 pm

1 stop9h 35m

Idaho Falls Fanning Field

Sat 10/31

1:46 pm-11:59 pm

1 stop9h 13m

$349

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 7/16

3:34 pm-4:00 pm

2 stops25h 26m

Idaho Falls Fanning Field

Mon 7/20

10:47 pm-6:05 pm

1 stop18h 18m

$390

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 6/11

7:03 pm-4:08 pm

2 stops22h 05m

Idaho Falls Fanning Field

Mon 6/15

10:56 pm-6:51 pm

1 stop18h 55m

$391
Quickest round-trip

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Tue 5/26

5:10 am-9:50 am

1 stop5h 40m

Idaho Falls Fanning Field

Sat 5/30

5:54 pm-11:57 pm

1 stop5h 03m

$404

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Sat 7/4

5:10 am-9:50 am

1 stop5h 40m

Idaho Falls Fanning Field

Fri 7/10

5:54 pm-11:57 pm

1 stop5h 03m

$416

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Mon 5/25

5:10 am-9:50 am

1 stop5h 40m

Idaho Falls Fanning Field

Sat 6/13

5:54 pm-11:57 pm

1 stop5h 03m

$417

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 6/11

5:10 am-9:50 am

1 stop5h 40m

Idaho Falls Fanning Field

Wed 6/17

4:10 pm-11:57 pm

1 stop6h 47m

$420

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Thu 9/10

6:41 pm-11:50 am

2 stops18h 09m

Idaho Falls Fanning Field

Mon 9/14

6:21 pm-11:51 am

1 stop16h 30m

$425

St. LouisIdaho Falls

STL - IDA

STLIDA

Lambert-St Louis

Mon 5/25

5:25 am-12:14 pm

1 stop7h 49m

Idaho Falls Fanning Field

Thu 5/28

2:08 pm-9:42 pm

1 stop6h 34m

$430

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 typical price of a round-trip flight between St. Louis and Idaho Falls?

What is the cheapest month to fly to Idaho Falls?

If you aren’t able to travel to Idaho Falls during the month of February, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $387.

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

4h 52m

Direct flights

None
The fastest flight from St. Louis to Idaho Falls takes 4h 52m
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

Frequently asked questions about flying from St. Louis to Idaho Falls

  • 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. 4h 52m 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
8,455 reviews
Search Delta flights
United AirlinesPriceFrom $355Free CancellationRating
7.4
9,716 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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