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>

$125 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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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, May 26 - Wed, Jun 3

1:25 pm - 7:23 pm

BOI

STL

28h 58m

1 stop

8:08 pm - 12:38 pm

STL

BOI

17h 30m

1 stop

$332Frontier

Thu, Jun 4 - Tue, Jun 9

4:03 pm - 4:37 pm

IDA

STL

23h 34m

1 stop

7:41 pm - 3:37 pm

STL

IDA

20h 56m

1 stop

$339Alaska Airlines

Tue, May 26 - Wed, Jun 3

1:25 pm - 8:55 am

BOI

STL

18h 30m

2 stops

8:08 pm - 12:38 pm

STL

BOI

17h 30m

1 stop

$344Frontier

Wed, Jun 10 - Tue, Jun 16

2:23 pm - 11:23 pm

GEG

STL

7h 00m

1 stop

7:55 pm - 11:59 pm

STL

GEG

6h 04m

1 stop

$347Delta

Wed, Sep 2 - Tue, Sep 8

1:38 pm - 12:30 am

GEG

STL

8h 52m

2 stops

9:00 am - 2:58 pm

STL

GEG

7h 58m

1 stop

$352United Airlines

Thu, May 21 - Tue, May 26

6:49 am - 4:46 pm

GEG

STL

7h 57m

1 stop

6:00 am - 11:17 am

STL

GEG

7h 17m

1 stop

$357Delta

Sat, May 23 - Sat, May 30

4:05 pm - 11:59 pm

BOI

STL

6h 54m

1 stop

5:25 am - 11:19 am

STL

BOI

6h 54m

1 stop

$357American Airlines

Tue, Jun 2 - Wed, Jun 3

12:46 pm - 11:54 pm

GEG

STL

9h 08m

1 stop

5:33 pm - 11:06 pm

STL

GEG

7h 33m

1 stop

$375Alaska Airlines

Sat, May 23 - Tue, May 26

6:30 am - 5:34 pm

GEG

STL

9h 04m

1 stop

6:00 am - 1:14 pm

STL

GEG

9h 14m

1 stop

$378American Airlines

Fri, Sep 4 - Wed, Sep 30

12:23 pm - 9:22 pm

BOI

STL

7h 59m

1 stop

9:00 am - 1:25 pm

STL

BOI

5h 25m

1 stop

$425United Airlines

Useful Info

Low season	January
High season	May
Cheapest flight	$125

Best time to beat the crowds with an average 1% drop in price.

Most popular time to fly with an average 1% 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.

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

$125 Find Cheap Flights from Idaho to St. Louis

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

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