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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

$76 CHEAP FLIGHTS from Idaho to St. Louis

STL

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

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41,299,237 searches in the past 7 days on KAYAK

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Filter your dealsChoose cabin class, free Wi-Fi and more.

Cheapest round-trip

$253

Overall average: $831

Frontier

Fri 1/9Tue 1/13

BOI - STL • 1 stop

Cheapest one-way

$76

Typical prices: $409-$508

Frontier

Thu 12/11

GEG - STL • 1 stop

Start a new search

KAYAK searches 100s of sites at once to find you the best travel deals.

We hope you love your trip to St. Louis!

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.

Round-trip

One-way

Last minute

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

Fri, Jan 9 - Tue, Jan 13

12:54 pm - 10:02 amBOI-STL

20h 08m1 stop

5:06 pm - 11:54 amSTL-BOI

43h 48m2 stops

$253Frontier

Find Deal

Sat, Jan 10 - Tue, Jan 13

1:45 pm - 11:25 pmBOI-STL

8h 40m2 stops

11:23 am - 9:58 pmSTL-BOI

11h 35m2 stops

$274Delta

Find Deal

Wed, Dec 3 - Wed, Dec 10

12:19 pm - 12:12 pmIDA-STL

22h 53m1 stop

7:43 pm - 2:36 pmSTL-IDA

43h 53m2 stops

$281Multiple Airlines

Find Deal

Sat, Jan 10 - Tue, Jan 13

2:37 pm - 8:58 pmBOI-STL

5h 21m1 stop

9:57 am - 7:45 pmSTL-BOI

10h 48m2 stops

$302United Airlines

Find Deal

Sun, Nov 16 - Wed, Nov 19

12:03 pm - 9:07 amGEG-STL

19h 04m1 stop

7:45 pm - 4:07 pmSTL-GEG

22h 22m2 stops

$302Multiple Airlines

Find Deal

Wed, Feb 25 - Sat, Feb 28

8:40 pm - 1:52 pmGEG-STL

15h 12m1 stop

2:55 pm - 7:44 pmSTL-GEG

6h 49m1 stop

$326Alaska Airlines

Find Deal

Sun, Dec 7 - Tue, Dec 9

6:03 am - 2:27 pmBOI-STL

7h 24m1 stop

7:00 am - 3:26 pmSTL-BOI

9h 26m1 stop

$349Alaska Airlines

Find Deal

Tue, Nov 11 - Fri, Nov 14

2:43 pm - 9:54 pmSUN-STL

6h 11m1 stop

9:00 am - 1:40 pmSTL-SUN

5h 40m1 stop

$351United Airlines

Find Deal

Sat, Jan 3 - Tue, Jan 6

11:59 pm - 8:56 amGEG-STL

6h 57m1 stop

7:45 am - 2:58 pmSTL-GEG

9h 13m1 stop

$362American Airlines

Find Deal

Tue, Nov 18 - Thu, Nov 20

6:37 am - 11:51 pmBOI-STL

16h 14m1 stop

7:00 am - 12:34 pmSTL-BOI

6h 34m1 stop

$388American Airlines

Find Deal

Useful Info

Low season	January
High season	November
Cheapest flight	$76

Best time to beat the crowds with an average 4% drop in price.

Most popular time to fly with an average 3% 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.

O'Fallon

Wentzville

Farmington

Eureka

Litchfield

Grafton

Shrewsbury

Glencoe

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

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

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

St. Louis (STL)

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.

STL

$76 Find Cheap Flights from Idaho to St. Louis

KAYAK searches hundreds of travel sites at once for deals on flights to St. Louis

Everything you should know

Cheap Flights from Idaho to St. Louis

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

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

Recent last minute flight deals from Idaho to St. Louis

Good to know

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?

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

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

Cabin class types available on flights to Idaho

Complete your trip to St. Louis with a hotel stay or car rental

Find direct flights for St. Louis

Flights to other popular destinations

Flights from domestic origins to St. Louis

Choose which airport to fly into in St. Louis

Find deals for your return flight