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IDA - STL

$238 Find Cheap Flights from Idaho Falls to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Idaho Falls to St. Louis departing on 6/7. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Idaho Falls to St. Louis, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Idaho Falls to St. Louis, as well as popular online travel agencies
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Cheap Flight Deals from Idaho Falls to St. Louis (IDA-STL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Idaho Falls to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Idaho Falls to St. Louis

KAYAK's recommended round-trip deals from the most popular airlines that fly from Idaho Falls to St. Louis.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
Hawaiian Airlines Logo
4:11 pm - 11:59 pmIDA-STL
6h 48m1 stop
Hawaiian Airlines Logo
6:44 am - 3:34 pmSTL-IDA
9h 50m1 stop
$460Hawaiian Airlines
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Wed, Apr 16 - Sun, Apr 20
Alaska Airlines Logo
4:11 pm - 11:59 pmIDA-STL
6h 48m1 stop
Alaska Airlines Logo
3:11 pm - 10:35 pmSTL-IDA
8h 24m1 stop
$461Alaska Airlines
Find Deal
Tue, Apr 15 - Sat, Apr 19
Delta Logo
1:10 pm - 9:03 pmIDA-STL
6h 53m1 stop
Delta Logo
6:00 am - 12:26 pmSTL-IDA
7h 26m2 stops
$486Delta
Find Deal
Wed, Apr 16 - Sun, Apr 20
Delta Logo
1:10 pm - 11:34 pmIDA-STL
9h 24m2 stops
Delta Logo
6:00 am - 12:26 pmSTL-IDA
7h 26m2 stops
$491Delta
Find Deal
Wed, Apr 16 - Sun, Apr 20
United Airlines Logo
4:15 pm - 4:31 pmIDA-STL
23h 16m1 stop
United Airlines Logo
8:00 am - 3:21 pmSTL-IDA
8h 21m2 stops
$543United Airlines
Find Deal
Tue, Apr 15 - Sat, Apr 19
United Airlines Logo
6:50 am - 11:15 pmIDA-STL
15h 25m2 stops
United Airlines Logo
6:30 am - 3:21 pmSTL-IDA
9h 51m2 stops
$551United Airlines
Find Deal
Tue, Apr 15 - Sat, Apr 19
United Airlines Logo
10:45 am - 4:31 pmIDA-STL
4h 46m1 stop
United Airlines Logo
4:45 pm - 9:44 amSTL-IDA
17h 59m1 stop
$571United Airlines
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Thu, Aug 14 - Sun, Aug 17
United Airlines Logo
10:45 am - 10:45 pmIDA-STL
11h 00m2 stops
United Airlines Logo
4:45 pm - 9:44 amSTL-IDA
17h 59m1 stop
$576United Airlines
Find Deal
Thu, Aug 14 - Sun, Aug 17
United Airlines Logo
5:00 am - 8:48 pmIDA-STL
14h 48m1 stop
United Airlines Logo
4:32 pm - 10:51 pmSTL-IDA
7h 19m1 stop
$611United Airlines
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Thu, Jun 5 - Sun, Jun 8
United Airlines Logo
2:38 pm - 9:50 pmIDA-STL
6h 12m1 stop
United Airlines Logo
4:45 pm - 9:44 amSTL-IDA
17h 59m1 stop
$620United Airlines
Find Deal
Fri, Jul 4 - Sun, Jul 6

KAYAK's insights & trends for Idaho Falls to St. Louis flights

Get data-powered insights and trends into flights from Idaho Falls to St. Louis to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Idaho Falls to St. Louis?

The average price of all round-trip flights from Idaho Falls to St. Louis clicked on KAYAK for each day over the last 12 months.
Your flight ticket price will generally be cheaper if you fly to St. Louis on a Thursday and more expensive on a Monday. On your return trip to Idaho Falls, you should consider flying back on a Tuesday, and avoid Mondays for better deals.
Find deals

Good to know

Low season

February

High season

May

Cheapest flight

$238
Best time to beat the crowds with an average 49% drop in price.
Most popular time to fly and prices are also 2% lower on average.
Flight from Idaho Falls to St. Louis

When to book flights from Idaho Falls to St. Louis

Are your dates flexible? Find out the best times to travel from Idaho Falls to St. Louis based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Idaho Falls to St. Louis

  • What is the cheapest flight from Idaho Falls to St. Louis?

    In the last 3 days, the lowest price for a flight from Idaho Falls to St. Louis was $238 for a one-way ticket and $460 for a round-trip.

  • Do I need a passport to fly between Idaho Falls and St. Louis?

    No, a passport isn't needed to fly from Idaho Falls to St. Louis. However, local authorities might ask for an official ID.

  • Which aircraft models fly most regularly from Idaho Falls to St. Louis?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Idaho Falls to St. Louis?

    Star Alliance, oneworld, and SkyTeam are the airline alliances operating flights between Idaho Falls and St. Louis, with oneworld being the most commonly used for this route.

  • How does KAYAK find such low prices on flights from Idaho Falls to St. Louis?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Idaho Falls to St. Louis.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Idaho Falls to St. Louis?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Idaho Falls is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Idaho Falls to St. Louis?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to St. Louis with an airline and back to Idaho Falls with another airline. Booking your flights between Idaho Falls and STL can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Idaho Falls to St. Louis?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to St. Louis from Idaho Falls up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top airline flying from Idaho Falls to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Idaho Falls to St. Louis. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Idaho Falls to St. Louis? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
DeltaOverall score based on 7898 reviews
8.2Boarding
7.3Food
7.9Comfort
7.9Entertainment
8.5Crew
Airline reviews

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

10.0 ExcellentSunderesh, Mar 2025AUS - BOS
Read more Delta reviews

Simply outstanding. Their new lounge for Delta One customers is a cut above the rest.

The Dekta Rep that checked us in was great. She's very personable, pleasant, and can tell she enjoys her job.

The plane was old with small storage areas that had problems closing/latching and not enough storage for everyone, and worn, damaged seats. Service was great but feel a little unsafe on such well used planes.

Terrible and im avoiding them in the future. My initial flight was delayed causing me to rebook my flight and when speaking with the representative to rebook I explained this is the second time my flights were delayed and they did nothing to help me. I wasn't booked to comfort plus or given a voucher or anything. I was almost late for my meeting that I needed to attend on Monday because of the games delta played delaying my flights even more and putting me in the very back of the plane next to an extremely intoxicated passenger

Flights on time. .Ride was as comfortable as can be expected in steerage. Luggage arrived at destination. Attendants were fairly friendly.

Great staff. Wifi is terrible. Signing up for skylines is a painstaking process. Had to call customer service just to get my flight itinerary and confirmation sent to me. Consistent delays. A well staffed company that is run so poorly. Upper management needs to be renewed.

The WiFi didn't seem as fast as it normally is

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

The crew was wonderful and attentive. The seats near exit row were restrictive. Offer healthy snacks please

Delta is a premier airline so my expectations are most always met.

Everything you need to know for your flight from Idaho Falls to St. Louis

Information on your arrival and departure airports

St. Louis (STL)
Idaho Falls (IDA)

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