STL

$143 Find Cheap Flights from Idaho 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 to St. Louis departing on 7/26. 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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Flight Deals

Cheap Flights from Idaho to St. Louis

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Idaho 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 to St. Louis

Sun, Aug 16 - Wed, Aug 26
Multiple Airlines Logo
9:14 pm - 6:15 pm
GEG
-
STL
19h 01m
1 stop
Multiple Airlines Logo
6:58 pm - 9:22 am
STL
-
GEG
16h 24m
1 stop
$242Multiple Airlines
Thu, Aug 20 - Wed, Aug 26
Multiple Airlines Logo
10:12 am - 7:36 pm
GEG
-
STL
7h 24m
1 stop
Multiple Airlines Logo
6:58 pm - 9:22 am
STL
-
GEG
16h 24m
1 stop
$245Multiple Airlines
Tue, Sep 1 - Wed, Sep 2
Frontier Logo
1:04 pm - 7:23 pm
BOI
-
STL
5h 19m
1 stop
Frontier Logo
8:08 pm - 12:09 pm
STL
-
BOI
17h 01m
1 stop
$260Frontier
Wed, Sep 9 - Tue, Sep 15
Delta Logo
5:45 pm - 12:36 am
BOI
-
STL
5h 51m
1 stop
Delta Logo
6:25 am - 1:38 pm
STL
-
BOI
8h 13m
1 stop
$263Delta
Tue, Sep 1 - Wed, Sep 2
American Airlines Logo
1:55 pm - 12:14 am
BOI
-
STL
9h 19m
2 stops
American Airlines Logo
6:00 am - 2:20 pm
STL
-
BOI
9h 20m
1 stop
$268American Airlines
Wed, Sep 9 - Tue, Sep 15
Southwest Logo
3:40 pm - 10:35 pm
BOI
-
STL
5h 55m
1 stop
Southwest Logo
7:00 am - 1:40 pm
STL
-
BOI
7h 40m
2 stops
$270Southwest
Tue, Sep 1 - Wed, Sep 2
Southwest Logo
12:35 pm - 10:10 pm
BOI
-
STL
8h 35m
2 stops
Southwest Logo
3:45 pm - 11:10 pm
STL
-
BOI
8h 25m
2 stops
$275Southwest
Thu, Jul 2 - Wed, Jul 8
Frontier Logo
1:25 pm - 6:53 pm
BOI
-
STL
28h 28m
1 stop
Frontier Logo
8:08 pm - 12:29 pm
STL
-
BOI
17h 21m
1 stop
$299Frontier
Tue, Aug 25 - Fri, Aug 28
Delta Logo
7:40 am - 1:38 pm
SUN
-
STL
4h 58m
1 stop
Delta Logo
2:10 pm - 10:08 pm
STL
-
SUN
8h 58m
2 stops
$356Delta
Wed, Jun 24 - Tue, Jul 14
American Airlines Logo
4:14 pm - 11:59 pm
JAC
-
STL
6h 45m
1 stop
American Airlines Logo
6:55 am - 2:59 pm
STL
-
JAC
9h 04m
2 stops
$364American Airlines
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$143
Best time to beat the crowds with an average 1% drop in price.
Most popular time to fly and prices are also 1% lower on average.
Flight from Spokane to St. Louis

FAQs for booking flights from Idaho to St. Louis

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

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Idaho 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 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 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 with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Idaho 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 up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Wentzville
Farmington
Eureka
Litchfield
Grafton
Shrewsbury
Glencoe

Everything you need to know for your flight to St. Louis

Information on the airport you'll fly into in St. Louis

St. Louis (STL)