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IDA - STL

$547 Find Cheap Flights from Idaho Falls to St. Louis

This is the cheapest round-trip 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 3/6. 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.
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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

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Idaho Falls to St. Louis.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
4:07 pm - 11:59 pmIDA-STL
6h 52m1 stop
3:21 pm - 10:36 pmSTL-IDA
8h 15m1 stop
$547Alaska Airlines
Find Deal
Thu, Mar 6 - Mon, Mar 10
4:07 pm - 11:59 pmIDA-STL
6h 52m1 stop
7:00 am - 3:30 pmSTL-IDA
9h 30m1 stop
$586Hawaiian Airlines
Find Deal
Fri, Mar 7 - Sun, Mar 9
2:35 pm - 9:34 pmIDA-STL
5h 59m1 stop
8:00 am - 5:03 pmSTL-IDA
10h 03m2 stops
$632United Airlines
Find Deal
Thu, Mar 6 - Mon, Mar 10
10:38 am - 11:33 pmIDA-STL
11h 55m2 stops
6:30 am - 5:03 pmSTL-IDA
11h 33m2 stops
$637United Airlines
Find Deal
Thu, Mar 6 - Mon, Mar 10
5:58 pm - 4:31 pmIDA-STL
21h 33m1 stop
4:30 pm - 9:28 amSTL-IDA
17h 58m1 stop
$700United Airlines
Find Deal
Sun, Jun 1 - Mon, Jun 30
6:00 am - 4:53 pmIDA-STL
9h 53m2 stops
2:20 pm - 6:13 pmSTL-IDA
4h 53m1 stop
$708Delta
Find Deal
Fri, Mar 7 - Sun, Mar 9
10:55 am - 4:31 pmIDA-STL
4h 36m1 stop
9:10 am - 5:17 pmSTL-IDA
9h 07m1 stop
$711United Airlines
Find Deal
Thu, Jun 5 - Sun, Jun 8
5:48 pm - 2:31 pmIDA-STL
19h 43m2 stops
4:30 pm - 1:27 pmSTL-IDA
21h 57m1 stop
$716United Airlines
Find Deal
Fri, Mar 7 - Sun, Mar 9
6:55 pm - 12:28 amIDA-STL
4h 33m1 stop
3:12 pm - 10:56 pmSTL-IDA
8h 44m2 stops
$947Delta
Find Deal
Mon, Apr 7 - Mon, Apr 14
7:15 am - 10:03 pmIDA-STL
13h 48m2 stops
10:12 am - 10:12 pmSTL-IDA
13h 00m2 stops
$1,094American Airlines
Find Deal
Fri, Mar 7 - Sun, Mar 9

Flights from Idaho Falls to St. Louis - Travel Insights & Trends

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.

Good to know

Low season

February

High season

May

Cheapest flight

$547
Best time to beat the crowds with an average 55% drop in price.
Most popular time to fly and prices are also 13% 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 $547 for a round-trip ticket.

  • 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?

    oneworld, Star Alliance, 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 8219 reviews
8.5Crew
7.9Entertainment
8.2Boarding
8.0Comfort
7.3Food
Airline reviews

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

10.0 ExcellentStephen, Feb 2025SFO - JFK
Read more Delta reviews

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

I loved having a most black flight crew during Black History Month; rather by design or accident I appreciated the representation. ❤️

This was the second flight this week with flight attendant Marcus I’m not sure if his last name is Lane or Lang but this guy is awesome. He funny, attentive and his service is 5 stars. Marcus makes business travel more enjoyable !

Although the flight left late, we arrived early. It was one of the quickest boarding and off boarding experiences I’ve had. It was kind of annoying the only drinks they had were water, coffee, and tea. The flight was very smooth, temperature was just right, and flight attendants were friendly.

Lower number on this flight so spaced out passengers. Able to enjoy more room to relax during flight. It was lovely.

Kind staff. Snacks are small but that’s the new normal.

The young man who was our flight attendant in first class was lazy and did not do his job well at all. Never offered drinks upon boarding - actually I take that back... said "are you okay with water" as if I do not want to get you anything else, only passed the snacks around once, got my drink order wrong and then never offered a second round of drinks. He was the worst I have ever seen on Delta and we fly a lot.

Great service. Great staff. Boarding was a little slow, but I think there was a service dog slowing things down.

Flight left early and arrived early. the whole trip was excellent.

Seats were really tight and the seat belts did not give enough slack.

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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