IDA - STL

$165 Find Cheap Flights from Idaho Falls to St. Louis - Compare and Save

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 9/12. 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
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$329
Typical prices: $459-$812
Delta
Sun 11/22Wed 12/2
IDA - STL • 1 stop
Cheapest one-way
$165
Typical prices: $175-$192
Alaska Airlines
Sat 9/12
IDA - STL • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Idaho Falls and St. Louis. You'll need at least 1 connection.
Insights
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Top layover airports
Seattle (SEA)
Cheapest • Avg $397 (round-trip)
Denver (DEN)
Shortest trip • 5h 15m (one-way)
Insights
Insights
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When to travel
May
Cheapest • 29% price drop
April
Most popular
Good to know
Good to know
+1
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Good to know
Good to know
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We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

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

Sun, Nov 22 - Wed, Dec 2
Delta Logo
6:56 pm - 12:30 am
IDA
-
STL
4h 34m
1 stop
Delta Logo
7:10 am - 12:15 pm
STL
-
IDA
6h 05m
1 stop
$329Delta
Sun, Nov 22 - Sat, Dec 5
Delta Logo
6:56 pm - 12:30 am
IDA
-
STL
4h 34m
1 stop
Delta Logo
7:10 am - 12:15 pm
STL
-
IDA
6h 05m
1 stop
$329Delta
Tue, Aug 25 - Tue, Sep 1
American Airlines Logo
2:20 pm - 11:42 pm
IDA
-
STL
8h 22m
1 stop
American Airlines Logo
6:00 am - 1:09 pm
STL
-
IDA
8h 09m
1 stop
$329American Airlines
Mon, Nov 23 - Wed, Dec 2
Delta Logo
6:56 pm - 12:30 am
IDA
-
STL
4h 34m
1 stop
Delta Logo
2:20 pm - 6:16 pm
STL
-
IDA
4h 56m
1 stop
$329Delta
Thu, Nov 26 - Wed, Dec 2
Delta Logo
1:11 pm - 9:08 pm
IDA
-
STL
6h 57m
1 stop
Delta Logo
7:10 am - 12:15 pm
STL
-
IDA
6h 05m
1 stop
$329Delta
Sat, Oct 24 - Wed, Oct 28
Alaska Airlines Logo
6:09 am - 3:44 pm
IDA
-
STL
8h 35m
1 stop
Alaska Airlines Logo
7:02 am - 3:20 pm
STL
-
IDA
9h 18m
1 stop
$379Alaska Airlines
Fri, Aug 14 - Tue, Aug 18
Alaska Airlines Logo
4:14 pm - 4:37 pm
IDA
-
STL
23h 23m
1 stop
Alaska Airlines Logo
7:56 pm - 3:20 pm
STL
-
IDA
20h 24m
1 stop
$379Alaska Airlines
Sat, Aug 15 - Wed, Aug 19
United Airlines Logo
4:04 pm - 11:40 pm
IDA
-
STL
6h 36m
1 stop
United Airlines Logo
9:00 am - 3:23 pm
STL
-
IDA
7h 23m
1 stop
$409United Airlines
Sun, Nov 22 - Thu, Dec 3
United Airlines Logo
2:35 pm - 9:01 pm
IDA
-
STL
5h 26m
1 stop
United Airlines Logo
1:30 pm - 5:22 pm
STL
-
IDA
4h 52m
1 stop
$419United Airlines
Thu, Aug 27 - Mon, Aug 31
United Airlines Logo
2:25 pm - 8:46 pm
IDA
-
STL
5h 21m
1 stop
United Airlines Logo
4:40 pm - 9:18 pm
STL
-
IDA
5h 38m
1 stop
$419United Airlines
Booking Insights

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.

How much is a round-trip flight from Idaho Falls to St. Louis?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Idaho Falls to St. Louis departing in November.

Flight prices are below average for this route right now.

Flights to St. Louis from Idaho Falls usually cost between $475 and $510 in November.
The lowest price found in the past 5 days was $329 on Delta (Nov 22-Dec 2).

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Idaho Falls to St. Louis, 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 Idaho Falls to St. Louis is May, where tickets cost $443 (return) on average. On the other hand, the most expensive months are December and February, where the average cost of round-trip tickets is $863 and $837 respectively.

Find deals

Good to know

Low season

February

Cheapest flight

$165
Best time to beat the crowds but there is an average 34% increase in price.
Most popular time to fly and prices are also 17% 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 5 days, the lowest price for a flight from Idaho Falls to St. Louis was $165 for a one-way ticket and $329 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?

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

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

    The two airlines most popular with KAYAK users for flights from Idaho Falls to St. Louis are Delta and United Airlines. With an average price for the route of $558 and an overall rating of 7.8, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $515 and an overall rating of 7.4.

  • 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.

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

Information on your arrival and departure airports

Idaho Falls (IDA)
St. Louis (STL)