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STL - IDA

$164 Find cheap flights from St. Louis to Idaho Falls

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Idaho Falls departing on 10/2. 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
0 bags
Thu 6/20
Thu 6/27

Search hundreds of travel sites at once for deals on flights to Idaho Falls

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Idaho Falls, 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 St. Louis to Idaho Falls, as well as popular online travel agencies
In the last 7 days travelers have searched 42,596,105 times on KAYAK, and here is why:

Save 21% or moreCompare multiple travel sites with one search.

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Cheap flight deals from St. Louis to Idaho Falls (STL-IDA)

 
These are the cheapest deals for flights from St. Louis to Idaho Falls currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. 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 St. Louis to Idaho Falls

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from St. Louis to Idaho Falls.

Recent one-way flight deals from St. Louis to Idaho Falls

Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Idaho Falls found on KAYAK recently.

Recent last minute flight deals from St. Louis to Idaho Falls

Leaving soon but still want a bargain? Check out these latest deals for last minute flights from St. Louis to Idaho Falls.

Recent direct flight deals from St. Louis to Idaho Falls

The latest deals for direct flights from St. Louis to Idaho Falls so you can sit back and relax without the need for a layover.

Cheap bus & train deals from St. Louis to Idaho Falls

Find recent round-trip train or bus tickets from St. Louis to Idaho Falls.

All round-trip flight deals to Idaho Falls

The cheapest plane tickets to Idaho Falls found on KAYAK recently.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
2:25 pm - 3:11 pmSTL-IDA
25h 46m1 stop
3:50 pm - 11:58 pmIDA-STL
7h 08m1 stop
$435Alaska Airlines
Find Deal
Fri, Oct 11 - Tue, Oct 15
7:00 am - 11:57 pmSTL-IDA
17h 57m1 stop
3:50 pm - 11:58 pmIDA-STL
7h 08m1 stop
$455Alaska Airlines
Find Deal
Fri, Oct 11 - Tue, Oct 15
9:00 am - 1:32 pmSTL-IDA
5h 32m1 stop
5:58 pm - 4:30 pmIDA-STL
21h 32m1 stop
$517United Airlines
Find Deal
Thu, Oct 3 - Sun, Oct 6
9:08 am - 1:28 pmSTL-IDA
5h 20m1 stop
2:35 pm - 10:11 pmIDA-STL
6h 36m1 stop
$522United Airlines
Find Deal
Thu, Jul 4 - Fri, Jul 12
4:36 pm - 9:08 pmSTL-IDA
5h 32m1 stop
5:58 pm - 2:36 pmIDA-STL
19h 38m2 stops
$537United Airlines
Find Deal
Thu, Jul 4 - Fri, Jul 12
5:30 pm - 9:08 pmSTL-IDA
28h 38m2 stops
5:58 pm - 2:36 pmIDA-STL
19h 38m2 stops
$545United Airlines
Find Deal
Thu, Jul 4 - Fri, Jul 12
2:25 pm - 3:11 pmSTL-IDA
25h 46m1 stop
6:10 am - 6:21 pmIDA-STL
11h 11m2 stops
$657Alaska Airlines
Find Deal
Fri, Oct 11 - Tue, Oct 15
2:28 pm - 6:17 pmSTL-IDA
4h 49m1 stop
7:00 pm - 12:56 amIDA-STL
4h 56m1 stop
$676Delta
Find Deal
Fri, May 31 - Tue, Jun 4
3:05 pm - 9:58 pmSTL-IDA
7h 53m2 stops
7:00 pm - 12:56 amIDA-STL
4h 56m1 stop
$681Delta
Find Deal
Fri, May 31 - Tue, Jun 4
6:11 am - 12:28 pmSTL-IDA
7h 17m2 stops
6:00 am - 6:41 pmIDA-STL
11h 41m2 stops
$901Delta
Find Deal
Fri, May 31 - Tue, Jun 4
7:44 am - 12:36 pmSTL-IDA
5h 52m1 stop
$164American Airlines
Find Deal
Wed, Oct 2
4:36 pm - 9:35 amSTL-IDA
17h 59m1 stop
$263United Airlines
Find Deal
Sat, Jun 29
5:30 pm - 9:35 amSTL-IDA
17h 05m2 stops
$294United Airlines
Find Deal
Sat, Jun 29
2:05 pm - 10:01 pmSTL-IDA
8h 56m2 stops
$299Delta
Find Deal
Wed, Oct 2

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

Get data-powered insights and trends into flights from St. Louis to Idaho Falls 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 St. Louis to Idaho Falls?

The average price of all flights from St. Louis to Idaho Falls clicked on KAYAK for each day over the last 12 months.
When flying from St. Louis to Idaho Falls, you should consider leaving on a Tuesday and avoid Fridays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Tuesdays and the most expensive ones on Saturdays.

What is the cheapest month to fly from St. Louis to Idaho Falls?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from St. Louis to Idaho Falls, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from St. Louis to Idaho Falls is February, where tickets cost $414 on average. On the other hand, the most expensive months are June and March, where the average cost of tickets is $779 and $701 respectively.

Which airlines provide the cheapest flights from St. Louis to Idaho Falls?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
The best deals for a one-way ticket found by KAYAK users over the last 3 days were on American Airlines ($164) and United Airlines ($263). The cheapest round-trip tickets were found on Alaska Airlines ($435) and United Airlines ($517).

Good to know

Low season

August

High season

May

Cheapest flight

$164
Best time to beat the crowds but there is an average 11% increase in price.
Most popular time to fly with an average 10% increase in price.
Flight from St. Louis to Idaho Falls

When to book flights from St. Louis to Idaho Falls

Are your dates flexible? Find out the best times to travel from St. Louis to Idaho Falls 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 St. Louis to Idaho Falls

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

    In the last 3 days, the lowest price for a flight from St. Louis to Idaho Falls was $164 for a one-way ticket and $435 for a round-trip.

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

    No

  • Which airports will I be using when flying from St. Louis to Idaho Falls?

    St. Louis and Idaho Falls are both served by 1 main airport. You will leave St. Louis from Lambert-St Louis and will be arriving at Idaho Falls Fanning Field.

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

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

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

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

  • Which is the best airline for flights from St. Louis to Idaho Falls, Delta or United Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Idaho Falls are Delta and United Airlines. With an average price for the route of $641 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $625 and an overall rating of 7.4.

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

    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 St. Louis to Idaho Falls.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Idaho Falls from St. Louis 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 St. Louis to Idaho Falls?

    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 Idaho Falls with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and IDA 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 St. Louis to Idaho Falls?

    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 Idaho Falls from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top airlines flying from St. Louis to Idaho Falls

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Idaho Falls. 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 St. Louis to Idaho Falls? 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 10595 reviews
7.9Comfort
8.0Entertainment
7.4Food
8.2Boarding
8.6Crew
Airline reviews

Rated entertainment as Mediocre as there were major problems with the Infotainment system that took probably a half hour for them to fix.

8.0 Excellentrghinftl, May 2024FLL - BOS
Read more about Delta reviews

Rated entertainment as Mediocre as there were major problems with the Infotainment system that took probably a half hour for them to fix.

Your crew could maybe answer the call bell at least one of the times I pressed it. I pressed it first time with 2.5 hours left in our flight bc my partner was hungry and wanted a sandwich. We finally got the sandwich with 40 mins left in the flight.

Delta crushed it. Flight attendant in first was attentive and just never stopped. Honestly one of the best domestic flights I’ve been on.

They were an hour late and they didn’t have my wheelchair for me

The Flight crew didn’t serve us until about 1.5 hours into the flight because of turbulence but after it ended it was fine to move around. They served us water only and snacks and then NEVER, NOT ONE TIME came through to collect trash until right before landing about 1.5 hours later. There was absolutely no need for that. They crew was just standing around talking and visiting with each other and really never tried to see if we might want something besides water or even try to come pick up trash. This is VERY unusual for a Delta flight but it was not what I would have expected for a 4 hour flight.

The 1st class male crew member was very pleasant - the short female with round glasses , maybe in 50’s had no personality- never spoke when delivering my food, drink, & never smiled the whole trip! In fact looked annoyed when the boarding proses was happening- I would never hire this woman - unfriendly . Have never dealt with a crew member like her-

5-hour delay due to storms in Tanoa and airspace restricted by Miami traffic controllers.

A regional sized plane was used for a cross country flight with no overhead bin space. I had to "pink check" my laptop and my medications. I was NOT pleased!!!!

Absolutely nothing flight was cancelled and delayed for 2 days. Barely a heads up I want a full refund

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

Fantastic. Smooth boarding with an infant. Never experienced it with any other carriers.

This was a Lufthansa flight, not United. The CSA at the counter, Ashley, was not only incompetent, but quite rude. Me and two other PAX waited over 7 minutes standing in front of her and another CSA and they ignored us. We joked that we must have accidently taken invisibility pills. She could have at least said "I'll be with you in a moment, I'm currently....". I could go on about how rude she and the other CSAs were (whispering, not communicating with me, blaming the situation on others, etc.). She would not work for me. Then, she gave me literally the worst seat on the plane. the worst. My seat kept getting bumped (rammed twice by the crew with their carts and about every 5 minutes by someone using the bathroom), listening to the bathroom all night, crowded seat, etc.

My seat was broken. WiFi didn’t work. Gate crew at HOU were rude and condescending. Treated all the passengers badly. Bad experience, United.

First flight of the day… MINIMUM FUEL! 15 minute landing delay at HOU due to fog turned into a 2+ hour delay! Rather than circle, they had to divert to another city to refuel! Sat on tarmac at Austin to refuel. We ALL missed our connections! The crew, including pilots, were clueless. Crew was really a mess. At HOU, Untied employees were exceedingly rude to all. It was pitiful.

An hour and a half late is UNACCEPTABLE. The negative impact to our family is unconscionable. And for the price we were forced to pay...

No lounge access with “United First” ticket. False alarm about late flight, jeopardizing connection. Wrong meal. Loose power socket would not hold plug, could not charge device. In-flight access to text messaging did not work. Toilet seat on plane would not stay up.

We ended up with seats in the very back. So they did not recline. Have no idea why, we reserved and checked in very early. The isles were very narrow and the seats had very little leg room. But they did give us water, and a snack.

Check in etc was very good. As for on the plane, it was like flying in a freezer. It was so cold, i have flown for years and never been so cold on a plane. Staff on board said its always cold when flying which is a load of rubbish. They wouldnt put any heating on and now i have the flu because of this .

I’ve had a couple flights this week on United that were delayed by an hour or more

Surprisingly easy! I was hesitant to try this, but the cost swayed me. I actually felt like I had less stress than all the taxiing and possible delays that occur with short regional flights where you spend less time in the air than getting to and from the plane..

Book cheap flights from St. Louis to Idaho Falls

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Idaho Falls found on KAYAK in the last 72 hours.
10/2Wed
1 stopAmerican Airlines
5h 52mSTL-IDA
$164
6/29Sat
1 stopUnited Airlines
17h 59mSTL-IDA
$263
6/29Sat
2 stopsUnited Airlines
17h 05mSTL-IDA
$294
10/2Wed
2 stopsDelta
8h 56mSTL-IDA
$299

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St. Louis - Idaho Falls Flights

Departure:

St. Louis (undefined)United States

Destination:

Idaho Falls (IDA)United States

Return flight deals:

Idaho Falls - St. Louis

Cabin classes: