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.

$153 CHEAP FLIGHTS from Idaho to St. Louis

Save 21% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Flight Deals

Cheap Flights from Idaho to St. Louis

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

Round-trip

One-way

Last minute

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

Tue, Nov 3 - Tue, Nov 10

5:45 am - 12:30 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

5h 45m1 stop Phoenix Sky Harbor Intl

2:05 pm - 9:40 pmSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

8h 35m1 stop Phoenix Sky Harbor Intl

$264Southwest

Wed, Oct 21 - Wed, Nov 11

2:41 pm - 11:42 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

8h 01m1 stop Dallas/Fort Worth

6:00 am - 1:51 pmSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

8h 51m1 stop Dallas/Fort Worth

$269American Airlines

Tue, Nov 3 - Tue, Nov 10

5:45 am - 12:30 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

5h 45m1 stop Phoenix Sky Harbor Intl

8:25 am - 3:50 pmSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

8h 25m2 stops Dallas Love Field Phoenix Sky Harbor Intl

$270Southwest

Wed, Oct 21 - Wed, Nov 11

2:02 pm - 11:42 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

8h 40m2 stops Phoenix Sky Harbor Intl Dallas/Fort Worth

7:26 am - 12:37 pmSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

6h 11m1 stop Chicago O'Hare Intl

$274American Airlines

Wed, Oct 28 - Thu, Oct 29

4:18 pm - 11:59 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

6h 41m1 stop Seattle/Tacoma Intl

7:02 am - 3:23 pmSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

9h 21m1 stop Seattle/Tacoma Intl

$288Alaska Airlines

Wed, Dec 9 - Wed, Dec 16

6:00 am - 1:36 pmGEG Spokane-STL Lambert-St Louis

5h 36m1 stop Salt Lake City

7:08 am - 12:21 pmSTL Lambert-St Louis-GEG Spokane

7h 13m1 stop Salt Lake City

$305Delta

Wed, Dec 9 - Wed, Dec 16

6:50 am - 2:44 pmGEG Spokane-STL Lambert-St Louis

5h 54m1 stop Minneapolis St Paul

7:08 am - 12:21 pmSTL Lambert-St Louis-GEG Spokane

7h 13m1 stop Salt Lake City

$305Delta

Thu, Oct 29 - Mon, Nov 2

5:00 am - 3:43 pmGEG Spokane-STL Lambert-St Louis

8h 43m2 stops Denver Intl Chicago O'Hare Intl

4:39 pm - 9:11 pmSTL Lambert-St Louis-GEG Spokane

6h 32m1 stop Denver Intl

$354United Airlines

Sat, Oct 31 - Wed, Nov 4

6:09 am - 3:44 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

8h 35m1 stop Seattle/Tacoma Intl

6:00 am - 3:18 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

10h 18m1 stop Seattle/Tacoma Intl

$392Alaska Airlines

Tue, Nov 10 - Wed, Nov 11

7:00 am - 6:05 pmGEG Spokane-STL Lambert-St Louis

9h 05m1 stop San Francisco

4:39 pm - 9:11 pmSTL Lambert-St Louis-GEG Spokane

6h 32m1 stop Denver Intl

$395United Airlines

Recent last minute flight deals from Idaho to St. Louis

Thu, Sep 17 - Sun, Sep 20

2:08 pm - 11:43 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

8h 35m1 stop Dallas/Fort Worth

7:00 am - 1:37 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

7h 37m1 stop Dallas/Fort Worth

$509American Airlines

Thu, Sep 17 - Fri, Sep 18

2:20 pm - 8:38 pmSUN Hailey Sun Valley-Friedman-STL Lambert-St Louis

5h 18m1 stop Denver Intl

12:59 pm - 7:27 pmSTL Lambert-St Louis-SUN Hailey Sun Valley-Friedman

7h 28m1 stop Chicago O'Hare Intl

$569United Airlines

Thu, Sep 17 - Fri, Sep 18

2:20 pm - 8:38 pmSUN Hailey Sun Valley-Friedman-STL Lambert-St Louis

5h 18m1 stop Denver Intl

12:59 pm - 9:12 pmSTL Lambert-St Louis-SUN Hailey Sun Valley-Friedman

9h 13m2 stops Chicago O'Hare Intl Denver Intl

$574United Airlines

Fri, Sep 18 - Sun, Sep 20

12:15 pm - 7:07 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

5h 52m1 stop Dallas/Fort Worth

7:00 am - 1:37 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

7h 37m1 stop Dallas/Fort Worth

$681American Airlines

Sun, Sep 20 - Tue, Sep 22

2:08 pm - 11:43 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

8h 35m1 stop Dallas/Fort Worth

5:43 am - 11:45 amSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

7h 02m1 stop Dallas/Fort Worth

$695American Airlines

Fri, Sep 18 - Sun, Sep 20

6:51 pm - 11:32 amIDA Idaho Falls Fanning Field-STL Lambert-St Louis

15h 41m1 stop Las Vegas Harry Reid Intl

8:10 pm - 11:34 amSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

16h 24m2 stops Denver Intl Las Vegas Harry Reid Intl

$774Multiple Airlines

Mon, Sep 21 - Thu, Sep 24

8:31 am - 6:38 pmGEG Spokane-STL Lambert-St Louis

8h 07m1 stop Seattle/Tacoma Intl

6:29 am - 12:39 pmSTL Lambert-St Louis-GEG Spokane

8h 10m1 stop Seattle/Tacoma Intl

$853Alaska Airlines

Sat, Sep 19 - Wed, Sep 23

6:45 am - 4:47 pmGEG Spokane-STL Lambert-St Louis

8h 02m1 stop Minneapolis St Paul

6:55 pm - 11:29 pmSTL Lambert-St Louis-GEG Spokane

6h 34m1 stop Salt Lake City

$853Delta

Thu, Sep 17 - Fri, Sep 18

7:00 pm - 12:44 amPIH Pocatello-STL Lambert-St Louis

4h 44m1 stop Salt Lake City

2:25 pm - 6:24 pmSTL Lambert-St Louis-PIH Pocatello

4h 59m1 stop Salt Lake City

$905Delta

Wed, Sep 16 - Tue, Sep 22

9:31 am - 6:38 pmGEG Spokane-STL Lambert-St Louis

7h 07m1 stop Seattle/Tacoma Intl

3:19 pm - 7:53 pmSTL Lambert-St Louis-GEG Spokane

6h 34m1 stop Seattle/Tacoma Intl

$948Alaska Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$153

Best time to beat the crowds with an average 7% drop in price.

Most popular time to fly with an average 9% increase in price.

Flight from Spokane 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.