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>

$149 Cheap Flights from Idaho to St. Louis

STL

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

...and more

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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

$256

Overall average: $450

Delta

Sat 1/17Sun 1/18

GEG - STL • 2 stops

Cheapest one-way

$149

Overall average: $381

United Airlines

Sat 1/10

BOI - 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

Sat, Jan 17 - Sun, Jan 18

9:20 am - 9:35 pm

GEG

STL

10h 15m2 stops

6:35 am - 6:40 pm

STL

GEG

14h 05m2 stops

$256Delta

Sat, Jan 10 - Sat, Jan 17

7:05 pm - 5:11 am

BOI

STL

9h 06m1 stop

4:15 pm - 9:52 pm

STL

BOI

6h 37m1 stop

$276United Airlines

Sat, Jan 10 - Sat, Jan 17

10:15 am - 8:58 pm

BOI

STL

9h 43m2 stops

4:15 pm - 9:52 pm

STL

BOI

6h 37m1 stop

$281United Airlines

Sat, Jan 17 - Sun, Jan 18

5:15 am - 2:48 pm

GEG

STL

7h 33m1 stop

5:00 pm - 10:51 pm

STL

GEG

7h 51m1 stop

$295Delta

Fri, Jan 16 - Thu, Jan 22

3:01 pm - 11:25 pm

BOI

STL

7h 24m1 stop

6:10 am - 4:17 pm

STL

BOI

11h 07m2 stops

$327Delta

Thu, Jan 22 - Sat, Jan 24

5:45 am - 1:54 pm

GEG

STL

6h 09m1 stop

6:19 pm - 12:23 am

STL

GEG

8h 04m1 stop

$344Alaska Airlines

Fri, Jan 16 - Thu, Jan 22

9:02 am - 10:46 pm

BOI

STL

12h 44m1 stop

2:50 pm - 11:01 pm

STL

BOI

9h 11m1 stop

$359Alaska Airlines

Mon, Jan 12 - Fri, Jan 16

6:00 am - 4:14 pm

GEG

STL

8h 14m1 stop

11:55 am - 6:49 pm

STL

GEG

8h 54m1 stop

$363American Airlines

Wed, Mar 25 - Sun, Mar 29

11:10 am - 9:25 pm

BOI

STL

9h 15m2 stops

7:10 pm - 1:25 am

STL

BOI

7h 15m1 stop

$422Southwest

Mon, Dec 29 - Fri, Jan 2

1:16 pm - 10:56 pm

IDA

STL

8h 40m1 stop

2:43 pm - 10:21 pm

STL

IDA

8h 38m1 stop

$671American Airlines

Useful Info

Low season	January
High season	May
Cheapest flight	$149

Best time to beat the crowds with an average 9% drop 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.

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)

STL

$149 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