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Cheap flights from Idaho to St. Louis from $146

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Idaho to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
2:50 pm - 11:17 amBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
19h 27m1 stop Las Vegas Harry Reid Intl
Frontier Logo
12:27 pm - 1:55 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
26h 28m1 stop Las Vegas Harry Reid Intl
$307Frontier
Thu, Sep 10 - Sun, Sep 13
Frontier Logo
2:50 pm - 11:17 amBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
19h 27m1 stop Las Vegas Harry Reid Intl
Frontier Logo
12:27 pm - 1:55 pmSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
26h 28m1 stop Las Vegas Harry Reid Intl
$318Frontier
Thu, Sep 10 - Sun, Sep 13
United Airlines Logo
4:05 pm - 11:44 pmIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
6h 39m1 stop Denver Intl
United Airlines Logo
5:10 am - 9:53 amSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
5h 43m1 stop Denver Intl
$356United Airlines
Wed, Oct 7 - Sun, Oct 11
United Airlines Logo
4:05 pm - 11:44 pmIDA  Idaho Falls Fanning Field-STL Lambert-St Louis
6h 39m1 stop Denver Intl
United Airlines Logo
5:10 am - 9:53 amSTL  Lambert-St Louis-IDA Idaho Falls Fanning Field
5h 43m1 stop Denver Intl
$364United Airlines
Fri, Oct 16 - Sun, Oct 18
Southwest Logo
4:45 pm - 11:20 pmBOI  Boise Air Term. Gowen Fld-STL Lambert-St Louis
5h 35m1 stop Phoenix Sky Harbor Intl
Southwest Logo
6:20 pm - 1:00 amSTL  Lambert-St Louis-BOI Boise Air Term. Gowen Fld
7h 40m1 stop Las Vegas Harry Reid Intl
$364Southwest
Thu, Oct 1 - Mon, Oct 5
Southwest Logo
6:05 am - 5:25 pmGEG  Spokane-STL Lambert-St Louis
9h 20m1 stop Phoenix Sky Harbor Intl
Southwest Logo
8:25 am - 1:30 pmSTL  Lambert-St Louis-GEG Spokane
7h 05m1 stop Sacramento Intl
$369Southwest
Wed, Dec 9 - Wed, Dec 16
American Airlines Logo
12:39 pm - 11:43 pmGEG  Spokane-STL Lambert-St Louis
9h 04m1 stop Dallas/Fort Worth
American Airlines Logo
3:34 pm - 8:25 pmSTL  Lambert-St Louis-GEG Spokane
6h 51m1 stop Dallas/Fort Worth
$369American Airlines
Wed, Sep 16 - Mon, Sep 21
American Airlines Logo
12:49 pm - 9:59 pmGEG  Spokane-STL Lambert-St Louis
7h 10m1 stop Dallas/Fort Worth
American Airlines Logo
3:20 pm - 8:43 pmSTL  Lambert-St Louis-GEG Spokane
7h 23m1 stop Dallas/Fort Worth
$369American Airlines
Wed, Oct 7 - Sat, Oct 17
Delta Logo
5:14 pm - 12:44 amGEG  Spokane-STL Lambert-St Louis
5h 30m1 stop Salt Lake City
Delta Logo
7:45 am - 12:19 pmSTL  Lambert-St Louis-GEG Spokane
6h 34m1 stop Salt Lake City
$369Delta
Mon, Oct 5 - Mon, Oct 12
Delta Logo
5:04 pm - 12:44 amGEG  Spokane-STL Lambert-St Louis
5h 40m1 stop Salt Lake City
Delta Logo
5:00 pm - 10:11 pmSTL  Lambert-St Louis-GEG Spokane
7h 11m1 stop Salt Lake City
$369Delta
Wed, Oct 21 - Sat, Oct 24

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Frontier flights from Idaho to St. Louis

Our best Frontier deals on Idaho to St. Louis flight tickets
Frontier
Sep 10
BOI2:50 pmBoise Air Term. Gowen Fld
19h 27m
1 stop
STL11:17 amLambert-St Louis
Sep 13
STL12:27 pmLambert-St Louis
26h 28m
1 stop
BOI1:55 pmBoise Air Term. Gowen Fld
$307
Frontier
Sep 10
BOI2:50 pmBoise Air Term. Gowen Fld
19h 27m
1 stop
STL11:17 amLambert-St Louis
Sep 13
STL12:27 pmLambert-St Louis
26h 28m
1 stop
BOI1:55 pmBoise Air Term. Gowen Fld
$318
Frontier
Sep 10
BOI2:50 pmBoise Air Term. Gowen Fld
19h 27m
1 stop
STL11:17 amLambert-St Louis
Sep 13
STL12:27 pmLambert-St Louis
26h 28m
1 stop
BOI1:55 pmBoise Air Term. Gowen Fld
$368

Southwest flights from Idaho to St. Louis

Our best Southwest deals on Idaho to St. Louis flight tickets
Southwest
Oct 1
BOI4:45 pmBoise Air Term. Gowen Fld
5h 35m
1 stop
STL11:20 pmLambert-St Louis
Oct 5
STL6:20 pmLambert-St Louis
7h 40m
1 stop
BOI1:00 amBoise Air Term. Gowen Fld
$364
Southwest
Dec 9
GEG6:05 amSpokane
9h 20m
1 stop
STL5:25 pmLambert-St Louis
Dec 16
STL8:25 amLambert-St Louis
7h 05m
1 stop
GEG1:30 pmSpokane
$369
Southwest
Dec 9
GEG6:40 amSpokane
8h 45m
2 stops
STL5:25 pmLambert-St Louis
Dec 16
STL5:30 amLambert-St Louis
9h 20m
2 stops
GEG12:50 pmSpokane
$379

momondo Fare Finder

 
Use the filters below to find and compare flights from Idaho to St. Louis that are best for you.

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Route

Depart

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Price

Cheapest round-trip

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Thu 9/10

2:50 pm-11:17 am

1 stop19h 27m

Lambert-St Louis

Sun 9/13

12:27 pm-1:55 pm

1 stop26h 28m

$307

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Thu 9/10

2:50 pm-11:17 am

1 stop19h 27m

Lambert-St Louis

Sun 9/13

12:27 pm-1:55 pm

1 stop26h 28m

$318

Idaho FallsSt. Louis

IDA Idaho Falls Fanning Field - STL Lambert-St Louis

IDASTL

Idaho Falls Fanning Field

Wed 10/7

4:05 pm-11:44 pm

1 stop6h 39m

Lambert-St Louis

Sun 10/11

5:10 am-9:53 am

1 stop5h 43m

$356

Idaho FallsSt. Louis

IDA Idaho Falls Fanning Field - STL Lambert-St Louis

IDASTL

Idaho Falls Fanning Field

Fri 10/16

4:05 pm-11:44 pm

1 stop6h 39m

Lambert-St Louis

Sun 10/18

5:10 am-9:53 am

1 stop5h 43m

$364

BoiseSt. Louis

BOI Boise Air Term. Gowen Fld - STL Lambert-St Louis

BOISTL

Boise Air Term. Gowen Fld

Thu 10/1

4:45 pm-11:20 pm

1 stop5h 35m

Lambert-St Louis

Mon 10/5

6:20 pm-1:00 am

1 stop7h 40m

$364

SpokaneSt. Louis

GEG Spokane - STL Lambert-St Louis

GEGSTL

Spokane

Wed 12/9

6:05 am-5:25 pm

1 stop9h 20m

Lambert-St Louis

Wed 12/16

8:25 am-1:30 pm

1 stop7h 05m

$369

SpokaneSt. Louis

GEG Spokane - STL Lambert-St Louis

GEGSTL

Spokane

Wed 9/16

12:39 pm-11:43 pm

1 stop9h 04m

Lambert-St Louis

Mon 9/21

3:34 pm-8:25 pm

1 stop6h 51m

$369

SpokaneSt. Louis

GEG Spokane - STL Lambert-St Louis

GEGSTL

Spokane

Wed 10/7

12:49 pm-9:59 pm

1 stop7h 10m

Lambert-St Louis

Sat 10/17

3:20 pm-8:43 pm

1 stop7h 23m

$369
Quickest round-trip

SpokaneSt. Louis

GEG Spokane - STL Lambert-St Louis

GEGSTL

Spokane

Mon 10/5

5:14 pm-12:44 am

1 stop5h 30m

Lambert-St Louis

Mon 10/12

7:45 am-12:19 pm

1 stop6h 34m

$369

SpokaneSt. Louis

GEG Spokane - STL Lambert-St Louis

GEGSTL

Spokane

Wed 10/21

5:04 pm-12:44 am

1 stop5h 40m

Lambert-St Louis

Sat 10/24

5:00 pm-10:11 pm

1 stop7h 11m

$369

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

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

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

What is the cheapest month to fly to St. Louis?

In general, January is the cheapest month to fly from Idaho to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $440. The month of May is another great option to travel to St. Louis, with average flight prices from Idaho averaging around $443.

Can stopping save me money on Idaho to St. Louis flights?

You could potentially save up to 69% on your flight if you consider stops on a Idaho to St. Louis flight.

Cheap Idaho to St. Louis flight deals and tips

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

Best Price Found

$146

Fastest flight time

4h 41m

Direct flights

None
The best one-way flight to St. Louis from Idaho in the past 72 hours is $146. The best round-trip flight deal from Idaho to St. Louis found on momondo in the last 72 hours is $307.
The fastest flight from Idaho to St. Louis takes 4h 41m
There are no direct flights from Idaho to St. Louis. There are no popular flight routes from Idaho to St. Louis.
Search flight deals

Frequently asked questions about flying from Idaho to St. Louis

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

    Prices for flights from Idaho to Lambert-St Louis Airport are refreshed on a daily basis.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Idaho to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Idaho to St. Louis

Compare and see reviews for airlines that fly from Idaho to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $164Free CancellationRating
7.8
8,515 reviews
Search Delta flights
United AirlinesPriceFrom $283Free CancellationRating
7.4
10,113 reviews
Search United Airlines flights
SouthwestPriceFrom $347Free CancellationRating
8.0
4,214 reviews
Search Southwest flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Maryland Heights
St. Peters
Hermann
Alton
Florissant
Collinsville
O'Fallon
Farmington
Clayton
Fenton
Festus
Wentzville
Eureka
Edwardsville
Litchfield
Grafton
Shrewsbury

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Idaho to St. Louis for you.

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

Yes. momondo enables you to select and highlight flights to St. Louis from Idaho with this policy.

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

Once you have performed a search for Idaho to St. Louis flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Idaho and alert you when they change.

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