What airlines fly to Idaho?

Delta, United Airlines and Southwest are the top three most popular airlines that fly to Idaho from St. Louis according to our data. Delta is the first choice among our users, with 40% of people opting to fly with this airline when traveling to Idaho. Keep in mind that there are 4 different airlines that fly to Idaho on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Lambert-St Louis to Idaho?

Frontier, Delta, and American Airlines are the most popular carriers operating from Lambert-St Louis to Idaho

When did momondo last update prices for flights from Lambert-St Louis Airport to Idaho?

Prices for flights from Lambert-St Louis Airport to Idaho refresh daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to Idaho?

There are 5 operators available for flights from Lambert-St Louis Airport to Idaho as of December 2025.

How old do you have to be to fly from Lambert-St Louis Airport to Idaho?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Idaho.

What documentation or ID do you need to fly to Idaho?

The travel and health documents you'll need for your trip to Idaho may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Idaho. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$80 Cheap Flights from St. Louis to Idaho in 2025/26

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Find the cheapest flights from St. Louis to Idaho

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:38 pm - 10:42 pm

STL

GEG

9h 04m2 stops

11:40 am - 12:18 am

GEG

STL

10h 38m2 stops

$256Delta

Sat, Mar 7 - Fri, Mar 13

6:00 am - 1:30 pm

STL

JAC

8h 30m1 stop

12:58 pm - 9:35 pm

JAC

STL

7h 37m1 stop

$257Delta

Sat, Jan 10 - Sat, Jan 17

11:23 am - 7:06 pm

STL

JAC

8h 43m2 stops

12:58 pm - 9:35 pm

JAC

STL

7h 37m1 stop

$262Delta

Sat, Jan 10 - Sat, Jan 17

8:05 am - 3:18 pm

STL

JAC

8h 13m2 stops

7:00 am - 4:03 pm

JAC

STL

8h 03m2 stops

$267United Airlines

Sat, Jan 10 - Sat, Jan 17

2:50 pm - 9:25 pm

STL

GEG

8h 35m1 stop

1:38 pm - 1:54 pm

GEG

STL

22h 16m1 stop

$317Alaska Airlines

Thu, Jan 8 - Mon, Jan 12

2:50 pm - 11:01 pm

STL

BOI

9h 11m1 stop

11:35 am - 1:54 pm

BOI

STL

25h 19m1 stop

$335Alaska Airlines

Thu, Jan 8 - Mon, Jan 12

4:15 pm - 8:42 pm

STL

JAC

5h 27m1 stop

2:00 pm - 11:59 pm

JAC

STL

8h 59m1 stop

$337United Airlines

Sat, Jan 10 - Tue, Jan 13

5:00 am - 11:55 am

STL

GEG

8h 55m1 stop

4:25 pm - 11:30 pm

GEG

STL

5h 05m1 stop

$366Southwest

Thu, Jan 1 - Mon, Jan 5

5:40 pm - 12:25 am

STL

BOI

7h 45m2 stops

11:15 am - 7:45 pm

BOI

STL

7h 30m1 stop

$402Southwest

Wed, Apr 22 - Mon, Apr 27

6:05 am - 12:31 pm

STL

BOI

7h 26m1 stop

1:37 pm - 11:47 pm

BOI

STL

9h 10m1 stop

$427American Airlines

Fri, May 1 - Mon, May 4

Alaska Airlines flights from St. Louis to Idaho

Our best Alaska Airlines deals on St. Louis to Idaho flight tickets

Alaska Airlines

Jan 8

STL2:50 pmLambert-St Louis

8h 35m

1 stop

GEG9:25 pmSpokane

Jan 12

GEG1:38 pmSpokane

22h 16m

1 stop

STL1:54 pmLambert-St Louis

$317

Find similar

Alaska Airlines

Jan 8

STL2:50 pmLambert-St Louis

9h 11m

1 stop

BOI11:01 pmBoise Air Term. Gowen Fld

Jan 12

BOI10:00 amBoise Air Term. Gowen Fld

26h 54m

1 stop

STL1:54 pmLambert-St Louis

$335

Find similar

Alaska Airlines

Jan 8

STL2:50 pmLambert-St Louis

8h 35m

1 stop

GEG9:25 pmSpokane

Jan 12

GEG7:28 pmSpokane

16h 26m

2 stops

STL1:54 pmLambert-St Louis

$342

Find similar

American Airlines flights from St. Louis to Idaho

Our best American Airlines deals on St. Louis to Idaho flight tickets

American Airlines

May 2

STL6:05 amLambert-St Louis

7h 30m

1 stop

GEG11:35 amSpokane

May 7

GEG2:03 pmSpokane

7h 21m

1 stop

STL11:24 pmLambert-St Louis

$397

Find similar

American Airlines

May 1

STL6:05 amLambert-St Louis

7h 26m

1 stop

BOI12:31 pmBoise Air Term. Gowen Fld

May 4

BOI1:37 pmBoise Air Term. Gowen Fld

9h 10m

1 stop

STL11:47 pmLambert-St Louis

$427

Find similar

American Airlines

Mar 27

STL6:00 amLambert-St Louis

7h 45m

1 stop

GEG11:45 amSpokane

Mar 31

GEG3:10 pmSpokane

6h 49m

1 stop

STL11:59 pmLambert-St Louis

$465

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Sat 3/7

3:38 pm-10:42 pm

2 stops9h 04m

Spokane

Fri 3/13

11:40 am-12:18 am

2 stops10h 38m

$256

St. LouisJackson

STL - JAC

STLJAC

Lambert-St Louis

Sat 1/10

6:00 am-1:30 pm

1 stop8h 30m

Jackson Hole

Sat 1/17

12:58 pm-9:35 pm

1 stop7h 37m

$257

St. LouisJackson

STL - JAC

STLJAC

Lambert-St Louis

Sat 1/10

11:23 am-7:06 pm

2 stops8h 43m

Jackson Hole

Sat 1/17

12:58 pm-9:35 pm

1 stop7h 37m

$262

St. LouisJackson

STL - JAC

STLJAC

Lambert-St Louis

Sat 1/10

8:05 am-3:18 pm

2 stops8h 13m

Jackson Hole

Sat 1/17

7:00 am-4:03 pm

2 stops8h 03m

$267

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Thu 1/8

2:50 pm-9:25 pm

1 stop8h 35m

Spokane

Mon 1/12

1:38 pm-1:54 pm

1 stop22h 16m

$317

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 1/8

2:50 pm-11:01 pm

1 stop9h 11m

Boise Air Term. Gowen Fld

Mon 1/12

11:35 am-1:54 pm

1 stop25h 19m

$335

St. LouisJackson

STL - JAC

STLJAC

Lambert-St Louis

Sat 1/10

4:15 pm-8:42 pm

1 stop5h 27m

Jackson Hole

Tue 1/13

2:00 pm-11:59 pm

1 stop8h 59m

$337

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

Thu 1/1

5:00 am-11:55 am

1 stop8h 55m

Spokane

Mon 1/5

4:25 pm-11:30 pm

1 stop5h 05m

$366

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 4/22

5:40 pm-12:25 am

2 stops7h 45m

Boise Air Term. Gowen Fld

Mon 4/27

11:15 am-7:45 pm

1 stop7h 30m

$402

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 5/1

6:05 am-12:31 pm

1 stop7h 26m

Boise Air Term. Gowen Fld

Mon 5/4

1:37 pm-11:47 pm

1 stop9h 10m

$427

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Idaho

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to Idaho?

In general, November is the cheapest month to fly from St. Louis to Idaho. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $358. If you don’t want to visit Idaho in November, then you should wait until September to fly from St. Louis, when ticket prices are also cheap, with an average price of $382.

What is the cheapest day to depart on your flight to Idaho?

Our data shows that Wednesday is the least expensive day to fly to Idaho. Tickets to fly out on this day can be as low as $371. On the other hand, Sunday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $590.

What is the cheapest time of day to depart on your flight to Idaho?

According to our data, the cheapest time of day to fly to Idaho is at noon. momondo users have found flights departing from St. Louis to Idaho at noon for as low as $435. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In the afternoon is when there is more demand to fly to Idaho, so prices are often more expensive at around $489 per ticket.

How far in advance should I book a flight to Idaho?

You are more likely to see cheaper flights to Idaho from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Idaho for around $423 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Idaho from St. Louis for as low as $264 on momondo.

Cheap St. Louis to Idaho flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Idaho

Fastest flight time	5h 16m
Direct flights	None

The fastest flight from St. Louis to Idaho takes 5h 16m

There are no direct flights from St. Louis to Idaho. There are no popular flight routes from St. Louis to Idaho.

Search flight deals

When did momondo last update prices for flights from Lambert-St Louis Airport to Idaho?
Prices for flights from Lambert-St Louis Airport to Idaho refresh daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Idaho?
There are 5 operators available for flights from Lambert-St Louis Airport to Idaho as of December 2025.
How old do you have to be to fly from Lambert-St Louis Airport to Idaho?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Idaho.
What documentation or ID do you need to fly to Idaho?
The travel and health documents you'll need for your trip to Idaho may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Idaho. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from St. Louis to Idaho

Compare and see reviews for airlines that fly from St. Louis to Idaho with momondo

Airline	Rating	Free Cancellation	Price
American Airlines	PriceFrom $186	Free Cancellation	Rating 7.2 11,054 reviews	Search American Airlines flights
Delta	PriceFrom $192	Free Cancellation	Rating 7.9 8,007 reviews	Search Delta flights
Southwest	PriceFrom $292	Free Cancellation	Rating 7.9 4,251 reviews	Search Southwest flights
United Airlines	PriceFrom $300	Free Cancellation	Rating 7.4 9,094 reviews	Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Idaho?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Idaho from St. Louis.

Can I find flights from St. Louis to Idaho with flexible booking policies on momondo?

momondo does allow users to show only those flights to Idaho from St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from St. Louis to Idaho?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Idaho.

I’m not ready to book a flight from St. Louis to Idaho right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Idaho from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.