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 45% 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, Hawaiian Airlines, 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 August 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.

$113 Cheap Flights from St. Louis to Idaho in 2025

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Find the cheapest flights from St. Louis to Idaho

Round-trip

One-way

Last minute

Cheap round-trip flights

6:00 am - 3:00 pmSTL-BOI

10h 00m1 stop

6:35 am - 2:39 pmBOI-STL

7h 04m1 stop

$250Alaska Airlines

Find Deal

mar., sep. 2 - mié., sep. 3

5:30 pm - 11:00 pmSTL-BOI

6h 30m1 stop

10:45 am - 5:47 pmBOI-STL

6h 02m1 stop

$251Delta

Find Deal

mar., sep. 2 - mar., sep. 9

6:10 am - 12:44 pmSTL-GEG

8h 34m1 stop

6:00 am - 3:09 pmGEG-STL

7h 09m1 stop

$267American Airlines

Find Deal

mar., sep. 9 - mar., sep. 16

7:55 pm - 10:58 amSTL-GEG

17h 03m1 stop

11:53 am - 9:06 amGEG-STL

19h 13m1 stop

$276Frontier

Find Deal

sáb., sep. 13 - dom., sep. 21

5:55 am - 10:55 amSTL-BOI

6h 00m1 stop

1:15 pm - 7:45 pmBOI-STL

5h 30m1 stop

$279Southwest

Find Deal

lun., sep. 1 - mié., sep. 3

7:23 am - 12:44 pmSTL-GEG

7h 21m1 stop

3:25 pm - 11:59 pmGEG-STL

6h 34m1 stop

$279American Airlines

Find Deal

lun., sep. 8 - lun., sep. 15

4:35 pm - 10:30 pmSTL-GEG

7h 55m2 stops

12:45 pm - 9:50 pmGEG-STL

7h 05m1 stop

$284Southwest

Find Deal

mar., sep. 9 - mar., sep. 16

12:25 pm - 9:24 pmSTL-BOI

9h 59m2 stops

6:20 am - 4:27 pmBOI-STL

9h 07m1 stop

$286United Airlines

Find Deal

mié., oct. 22 - lun., oct. 27

5:15 am - 9:42 amSTL-BOI

5h 27m1 stop

5:00 am - 12:43 pmBOI-STL

6h 43m1 stop

$345United Airlines

Find Deal

lun., sep. 1 - mié., sep. 3

10:49 am - 10:58 amSTL-GEG

26h 09m2 stops

11:53 am - 9:06 amGEG-STL

19h 13m1 stop

$353Frontier

Find Deal

jue., sep. 18 - dom., sep. 21

Alaska Airlines flights from St. Louis to Idaho

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

Alaska Airlines

Sep 2

STL6:00 amLambert-St Louis

10h 00m

1 stop

BOI3:00 pmBoise Air Term. Gowen Fld

Sep 3

BOI6:35 amBoise Air Term. Gowen Fld

7h 04m

1 stop

STL2:39 pmLambert-St Louis

$250

Find similar

Alaska Airlines

Sep 2

STL6:00 amLambert-St Louis

10h 00m

1 stop

BOI3:00 pmBoise Air Term. Gowen Fld

Sep 5

BOI6:35 amBoise Air Term. Gowen Fld

7h 04m

1 stop

STL2:39 pmLambert-St Louis

$264

Find similar

Alaska Airlines

Sep 2

STL6:00 amLambert-St Louis

10h 00m

1 stop

BOI3:00 pmBoise Air Term. Gowen Fld

Sep 8

BOI2:28 pmBoise Air Term. Gowen Fld

8h 31m

1 stop

STL11:59 pmLambert-St Louis

$268

Find similar

Delta flights from St. Louis to Idaho

Our best Delta deals on St. Louis to Idaho flight tickets

Delta

Sep 2

STL5:30 pmLambert-St Louis

6h 30m

1 stop

BOI11:00 pmBoise Air Term. Gowen Fld

Sep 9

BOI10:45 amBoise Air Term. Gowen Fld

6h 02m

1 stop

STL5:47 pmLambert-St Louis

$251

Find similar

Delta

Sep 2

STL5:30 pmLambert-St Louis

6h 30m

1 stop

BOI11:00 pmBoise Air Term. Gowen Fld

Sep 9

BOI4:19 pmBoise Air Term. Gowen Fld

15h 17m

2 stops

STL8:36 amLambert-St Louis

$262

Find similar

Delta

Sep 2

STL5:30 pmLambert-St Louis

7h 26m

1 stop

BOI11:56 pmBoise Air Term. Gowen Fld

Sep 6

BOI3:06 pmBoise Air Term. Gowen Fld

7h 17m

1 stop

STL11:23 pmLambert-St Louis

$265

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

mar. 9/2

6:00 am-3:00 pm

1 stop10h 00m

Boise Air Term. Gowen Fld

mié. 9/3

6:35 am-2:39 pm

1 stop7h 04m

$250

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

mar. 9/2

5:30 pm-11:00 pm

1 stop6h 30m

Boise Air Term. Gowen Fld

mar. 9/9

10:45 am-5:47 pm

1 stop6h 02m

$251

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

mar. 9/9

6:10 am-12:44 pm

1 stop8h 34m

Spokane

mar. 9/16

6:00 am-3:09 pm

1 stop7h 09m

$267

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

sáb. 9/13

7:55 pm-10:58 am

1 stop17h 03m

Spokane

dom. 9/21

11:53 am-9:06 am

1 stop19h 13m

$276

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

lun. 9/1

5:55 am-10:55 am

1 stop6h 00m

Boise Air Term. Gowen Fld

mié. 9/3

1:15 pm-7:45 pm

1 stop5h 30m

$279

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

lun. 9/8

7:23 am-12:44 pm

1 stop7h 21m

Spokane

lun. 9/15

3:25 pm-11:59 pm

1 stop6h 34m

$279

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

mar. 9/9

4:35 pm-10:30 pm

2 stops7h 55m

Spokane

mar. 9/16

12:45 pm-9:50 pm

1 stop7h 05m

$284

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

mié. 10/22

12:25 pm-9:24 pm

2 stops9h 59m

Boise Air Term. Gowen Fld

lun. 10/27

6:20 am-4:27 pm

1 stop9h 07m

$286

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

lun. 9/1

5:15 am-9:42 am

1 stop5h 27m

Boise Air Term. Gowen Fld

mié. 9/3

5:00 am-12:43 pm

1 stop6h 43m

$345

St. LouisSpokane

STL - GEG

STLGEG

Lambert-St Louis

jue. 9/18

10:49 am-10:58 am

2 stops26h 09m

Spokane

dom. 9/21

11:53 am-9:06 am

1 stop19h 13m

$353

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, April 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 $316. If you don’t want to visit Idaho in April, then you should wait until October to fly from St. Louis, when ticket prices are also cheap, with an average price of $377.

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 $411 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 $262 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

Best Price Found	$113
Fastest flight time	4h 42m
Direct flights	None
Airports in Idaho	6 airports

The best one-way flight to Idaho from St. Louis in the past 72 hours is $113. The best round-trip flight deal from St. Louis to Idaho found on momondo in the last 72 hours is $250.

The fastest flight from St. Louis to Idaho takes 4h 42m

There are no direct flights from St. Louis to Idaho. Popular non-direct routes for this connection are Lambert-St Louis Airport - Boise Air Term. Gowen Fld Airport, Lambert-St Louis Airport - Idaho Falls Fanning Field Airport and Lambert-St Louis Airport - Spokane Airport.

There are 6 airports near Idaho: West Yellowstone (WYS), Idaho Falls Fanning Field (IDA), Spokane (GEG), Boise Air Term. Gowen Fld (BOI), Jackson Hole (JAC), Pocatello (PIH)

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 August 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 $239	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Delta	PriceFrom $273	Free Cancellation	Rating 8.0 7,979 reviews	Search Delta flights
United Airlines	PriceFrom $287	Free Cancellation	Rating 7.4 8,920 reviews	Search United Airlines flights
Southwest	PriceFrom $292	Free Cancellation	Rating 8.0 4,246 reviews	Search Southwest 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.