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.

$141 CHEAP FLIGHTS from Idaho to St. Louis

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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

Wed, Dec 2 - Wed, Dec 9

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

5h 45m1 stop Phoenix Sky Harbor Intl

6:30 am - 11:00 amSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

5h 30m1 stop Denver Intl

$314Southwest

Mon, Nov 23 - Thu, Nov 26

2:03 pm - 11:49 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

8h 46m1 stop Phoenix Sky Harbor Intl

7:58 am - 5:00 pmSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

10h 02m1 stop Phoenix Sky Harbor Intl

$319American Airlines

Tue, Dec 1 - Wed, Dec 2

3:45 pm - 11:10 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

6h 25m1 stop Las Vegas Harry Reid Intl

6:30 am - 11:00 amSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

5h 30m1 stop Denver Intl

$319Southwest

Thu, Dec 3 - Mon, Dec 7

6:06 am - 1:36 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

6h 30m1 stop Phoenix Sky Harbor Intl

6:02 am - 12:59 pmSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

7h 57m1 stop Chicago O'Hare Intl

$319American Airlines

Thu, Nov 26 - Tue, Dec 1

8:49 am - 2:36 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

4h 47m1 stop Salt Lake City

5:20 pm - 12:10 amSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

7h 50m1 stop Minneapolis St Paul

$359Delta

Tue, Nov 24 - Tue, Dec 1

5:30 am - 12:21 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

5h 51m1 stop Minneapolis St Paul

5:20 pm - 12:10 amSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

7h 50m1 stop Minneapolis St Paul

$369Delta

Thu, Dec 17 - Sat, Jan 9

8:21 am - 11:59 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

14h 38m1 stop Seattle/Tacoma Intl

3:54 pm - 11:46 pmSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

8h 52m1 stop Seattle/Tacoma Intl

$369Alaska Airlines

Mon, Jan 11 - Thu, Jan 14

2:35 pm - 8:38 pmBOI Boise Air Term. Gowen Fld-STL Lambert-St Louis

5h 03m1 stop Denver Intl

8:30 am - 4:46 pmSTL Lambert-St Louis-BOI Boise Air Term. Gowen Fld

9h 16m1 stop San Francisco

$385United Airlines

Fri, Nov 13 - Tue, Nov 17

6:04 am - 2:25 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

7h 21m1 stop Seattle/Tacoma Intl

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

10h 18m1 stop Seattle/Tacoma Intl

$399Alaska Airlines

Sat, Nov 14 - Wed, Nov 18

10:35 am - 4:57 pmIDA Idaho Falls Fanning Field-STL Lambert-St Louis

5h 22m1 stop Denver Intl

8:50 am - 3:38 pmSTL Lambert-St Louis-IDA Idaho Falls Fanning Field

7h 48m1 stop Denver Intl

$399United Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$141

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

Most popular time to fly with an average 5% increase in price.

Flight from Boise 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.