How long is the flight from Idaho to St. Louis?

There are many flights that can get you from Idaho to St. Louis in 8h 52m. Fly via Frontier, Delta, or American Airlines to get the fastest option. Idaho and St. Louis are separated by a distance of 1378 mi. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines to fly from Idaho to St. Louis one-way?

To fly one-way, consider booking your trip with Hawaiian Airlines, which is currently one of the cheapest options available, starting at $141. Alaska Airlines flights start at $142 while deals on United Airlines start at $154 one-way.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What are the most popular routes from Idaho to St. Louis?

When deciding which route to take from Idaho to St. Louis consider Spokane - Lambert-St Louis, Boise Air Term. Gowen Fld - Lambert-St Louis or Idaho Falls Fanning Field - Lambert-St Louis as they are the most popular.

What are the most popular airlines that fly from Idaho to St. Louis?

When booking a flight from Idaho to St. Louis, you may want to consider flying on American Airlines, Alaska Airlines or Delta as they are the most popular for this route.

What airport do you fly into for flights to St. Louis from Idaho?

Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to St. Louis from Idaho.

Can I find deals for flights from Idaho to St. Louis that include hotel bookings?

Yes. In addition to deals on Idaho to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Idaho to St. Louis?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to St. Louis.

Can I find deals for business class flights from Idaho to St. Louis?

Yes. Cheapflights offers flight deals from Idaho to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$141+ Cheap Flights from Idaho to St. Louis

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Cheap flight deals from Idaho to St. Louis

Round-trip from	$234 (Kiwi.com)
One-way from	$141 (Trip.com)
Popular in	January
Cheapest in	April
Average price	$420

From Idaho to Lambert-St Louis

Search Deals

One-way flight from Idaho to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 16% potential increase in price ($86 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 8% potential price decrease ($36 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2025

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Find flight deals from Idaho to St. Louis

Cheapest flights from Idaho to St. Louis
Explore the most affordable flight options available from Idaho to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 17, 2025.

jue. 11/139:16 pmGEG - STL

1 stop14h 41mMultiple Airlines

sáb. 11/157:45 pmSTL - GEG

1 stop17h 23mMultiple Airlines

Deal found 9/15

$234

jue. 11/69:16 pmGEG - STL

1 stop14h 41mMultiple Airlines

sáb. 11/87:45 pmSTL - GEG

1 stop17h 23mMultiple Airlines

Deal found 9/15

$243

jue. 12/412:23 pmGEG - STL

1 stop19h 39mFrontier

sáb. 12/67:43 pmSTL - GEG

1 stop17h 45mFrontier

Deal found 9/15

$249

sáb. 11/15:51 amGEG - STL

1 stop7h 27mAlaska Airlines

lun. 11/37:00 amSTL - GEG

1 stop7h 26mAlaska Airlines

Deal found 9/17

$272

mié. 11/55:51 amGEG - STL

1 stop7h 27mAlaska Airlines

jue. 11/64:14 pmSTL - GEG

1 stop7h 00mAlaska Airlines

Deal found 9/16

$274

mar. 10/147:15 amGEG - STL

2 stops9h 25mDelta

mar. 10/212:29 pmSTL - GEG

2 stops8h 36mDelta

Deal found 9/16

$282

jue. 12/116:44 amBOI - STL

1 stop8h 52mAmerican Airlines

mar. 12/235:16 pmSTL - BOI

1 stop6h 40mAmerican Airlines

Deal found 9/15

$287

lun. 10/277:35 amGEG - STL

1 stop14h 24mAlaska Airlines

mié. 10/297:00 amSTL - GEG

1 stop7h 26mAlaska Airlines

Deal found 9/16

$290

mar. 10/144:50 pmGEG - STL

1 stop5h 34mDelta

mié. 10/296:50 amSTL - GEG

2 stops10h 07mDelta

Deal found 9/16

$300

dom. 10/512:22 pmBOI - STL

1 stop19h 44mFrontier

mié. 10/87:52 pmSTL - BOI

1 stop16h 51mFrontier

Deal found 9/15

$302

mar. 11/114:43 pmGEG - STL

1 stop6h 03mDelta

vie. 11/146:50 amSTL - GEG

2 stops10h 04mDelta

Deal found 9/16

$306

vie. 10/242:39 pmBOI - STL

1 stop5h 07mUnited Airlines

lun. 10/275:29 pmSTL - BOI

1 stop6h 59mUnited Airlines

Deal found 9/14

$322

Best flights from Idaho to St. Louis
Discover carefully curated flight deals from Idaho to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated septiembre 17, 2025.

jue. 11/139:16 pmGEG - STL

1 stop14h 41mMultiple Airlines

sáb. 11/157:45 pmSTL - GEG

1 stop17h 23mMultiple Airlines

Deal found 9/15

$234

jue. 12/412:23 pmGEG - STL

1 stop19h 39mFrontier

sáb. 12/67:43 pmSTL - GEG

1 stop17h 45mFrontier

Deal found 9/15

$249

mar. 10/149:22 amGEG - STL

2 stops13h 02mDelta

mié. 10/296:00 amSTL - GEG

2 stops10h 57mDelta

Deal found 9/16

$282

jue. 12/116:44 amBOI - STL

1 stop8h 52mAmerican Airlines

mar. 12/235:16 pmSTL - BOI

1 stop6h 40mAmerican Airlines

Deal found 9/15

$287

jue. 10/301:20 pmGEG - STL

1 stop8h 39mHawaiian Airlines

mar. 11/47:00 amSTL - GEG

1 stop7h 26mHawaiian Airlines

Deal found 9/16

$290

jue. 10/94:00 pmGEG - STL

1 stop5h 58mUnited Airlines

mié. 10/156:30 amSTL - GEG

1 stop7h 12mUnited Airlines

Deal found 9/15

$291

jue. 11/206:28 amBOI - STL

1 stop7h 50mAlaska Airlines

dom. 11/234:15 pmSTL - BOI

1 stop29h 47mAlaska Airlines

Deal found 9/16

$394

vie. 10/247:00 amBOI - STL

2 stops11h 20mSouthwest

lun. 10/274:40 pmSTL - BOI

2 stops9h 00mSouthwest

Deal found 9/16

$398

mar. 10/145:05 amGEG - STL

2 stops11h 35mDelta

mar. 10/216:50 amSTL - GEG

1 stop7h 11mDelta

Deal found 9/16

$300

dom. 10/512:22 pmBOI - STL

1 stop19h 44mFrontier

mié. 10/87:52 pmSTL - BOI

1 stop16h 51mFrontier

Deal found 9/15

$302

vie. 10/241:28 pmBOI - STL

1 stop8h 50mAmerican Airlines

lun. 10/276:23 pmSTL - BOI

1 stop6h 09mAmerican Airlines

Deal found 9/16

$322

vie. 10/242:39 pmBOI - STL

1 stop5h 07mUnited Airlines

lun. 10/275:29 pmSTL - BOI

1 stop6h 59mUnited Airlines

Deal found 9/14

$322

mié. 11/56:10 amGEG - STL

2 stops10h 35mDelta

jue. 11/66:00 amSTL - GEG

1 stop7h 41mDelta

Deal found 9/16

$300

lun. 10/137:40 pmIDA - STL

2 stops12h 27mMultiple Airlines

lun. 10/206:33 amSTL - IDA

1 stop10h 05mMultiple Airlines

Deal found 9/15

$337

mar. 11/114:43 pmGEG - STL

1 stop6h 03mDelta

vie. 11/146:50 amSTL - GEG

2 stops10h 04mDelta

Deal found 9/16

$306

sáb. 11/86:05 amIDA - STL

1 stop8h 13mHawaiian Airlines

jue. 11/134:14 pmSTL - IDA

1 stop8h 45mHawaiian Airlines

Deal found 9/16

$379

jue. 10/302:17 pmGEG - STL

1 stop6h 49mDelta

mar. 11/46:00 amSTL - GEG

2 stops10h 57mDelta

Deal found 9/16

$322

mar. 11/111:58 pmIDA - STL

1 stop8h 00mAmerican Airlines

dom. 11/165:17 amSTL - IDA

1 stop9h 10mAmerican Airlines

Deal found 9/15

$401

jue. 11/612:51 pmGEG - STL

1 stop6h 47mDelta

sáb. 11/86:00 amSTL - GEG

2 stops10h 57mDelta

Deal found 9/15

$322

mar. 9/303:57 pmIDA - STL

1 stop21h 42mAlaska Airlines

sáb. 10/46:33 amSTL - IDA

1 stop10h 05mAlaska Airlines

Deal found 9/16

$485

mar. 9/305:00 amIDA - STL

1 stop6h 44mUnited Airlines

sáb. 10/45:15 amSTL - IDA

1 stop5h 33mUnited Airlines

Deal found 9/15

$456

mar. 9/306:13 amIDA - STL

1 stop7h 26mHawaiian Airlines

sáb. 10/46:33 amSTL - IDA

1 stop10h 05mHawaiian Airlines

Deal found 9/15

$480

mar. 10/214:15 pmIDA - STL

1 stop6h 48mAlaska Airlines

dom. 10/267:00 amSTL - IDA

1 stop9h 13mAlaska Airlines

Deal found 9/17

$487

vie. 10/247:45 pmBOI - STL

2 stops12h 06mDelta

lun. 10/278:53 amSTL - BOI

1 stop6h 09mDelta

Deal found 9/14

$341

sáb. 2/287:05 amLWS - STL

2 stops14h 05mDelta

mar. 3/37:30 amSTL - LWS

2 stops15h 32mDelta

Deal found 9/15

$365

lun. 10/135:56 pmIDA - STL

1 stop25h 50mUnited Airlines

lun. 10/205:28 pmSTL - IDA

2 stops17h 20mUnited Airlines

Deal found 9/15

$540

jue. 11/201:50 pmBOI - STL

2 stops9h 56mDelta

dom. 11/236:00 amSTL - BOI

2 stops11h 05mDelta

Deal found 9/15

$380

jue. 10/162:25 pmSUN - STL

2 stops23h 02mUnited Airlines

jue. 10/239:20 amSTL - SUN

2 stops12h 58mUnited Airlines

Deal found 9/16

$600

jue. 12/117:45 pmBOI - STL

2 stops12h 25mDelta

mar. 12/236:59 pmSTL - BOI

1 stop5h 53mDelta

Deal found 9/15

$387

mar. 10/211:00 pmPIH - STL

1 stop4h 40mDelta

dom. 10/266:50 amSTL - PIH

1 stop6h 28mDelta

Deal found 9/17

$417

Last-minute flights from Idaho to St. Louis
Discover last-minute flight deals from Idaho to St. Louis. Data last updated septiembre 17, 2025 and is based on user searches.

dom. 10/512:22 pmBOI - STL

1 stop19h 44mFrontier

mié. 10/87:52 pmSTL - BOI

1 stop16h 51mFrontier

Deal found 9/15

$302

mié. 10/812:33 pmGEG - STL

1 stop8h 45mAmerican Airlines

dom. 10/125:11 amSTL - GEG

1 stop8h 32mAmerican Airlines

Deal found 9/16

$365

jue. 10/99:08 pmGEG - STL

1 stop12h 35mMultiple Airlines

mié. 10/157:52 pmSTL - GEG

2 stops26h 26mMultiple Airlines

Deal found 9/15

$343

vie. 10/104:50 pmGEG - STL

1 stop5h 34mDelta

lun. 10/136:50 amSTL - GEG

1 stop7h 11mDelta

Deal found 9/16

$383

lun. 10/137:40 pmIDA - STL

2 stops12h 27mMultiple Airlines

lun. 10/206:33 amSTL - IDA

1 stop10h 05mMultiple Airlines

Deal found 9/15

$337

mar. 10/147:15 amGEG - STL

2 stops9h 25mDelta

mar. 10/212:29 pmSTL - GEG

2 stops8h 36mDelta

Deal found 9/16

$282

jue. 10/2311:15 pmGEG - STL

1 stop6h 52mDelta

dom. 11/28:53 amSTL - GEG

1 stop6h 12mDelta

Deal found 9/16

$339

jue. 10/234:50 pmGEG - STL

1 stop5h 34mDelta

dom. 10/266:00 amSTL - GEG

2 stops10h 57mDelta

Deal found 9/15

$393

vie. 10/242:39 pmBOI - STL

1 stop5h 07mUnited Airlines

lun. 10/275:29 pmSTL - BOI

1 stop6h 59mUnited Airlines

Deal found 9/14

$322

vie. 10/247:45 pmBOI - STL

2 stops12h 06mDelta

lun. 10/278:53 amSTL - BOI

1 stop6h 09mDelta

Deal found 9/14

$341

lun. 10/277:35 amGEG - STL

1 stop14h 24mAlaska Airlines

mié. 10/297:00 amSTL - GEG

1 stop7h 26mAlaska Airlines

Deal found 9/16

$290

jue. 10/302:17 pmGEG - STL

1 stop6h 49mDelta

mar. 11/46:00 amSTL - GEG

2 stops10h 57mDelta

Deal found 9/16

$322

One-way flights from Idaho to St. Louis
Search for one-way flight options from Idaho to St. Louis. Find affordable one-way fares based on user searches. Data last updated septiembre 17, 2025.

sáb. 11/15:51 amGEG - STL

1 stop7h 27mHawaiian Airlines

Deal found 9/16

$141

mié. 11/55:51 amGEG - STL

1 stop7h 27mAlaska Airlines

Deal found 9/16

$142

sáb. 11/155:51 amGEG - STL

1 stop7h 27mHawaiian Airlines

Deal found 9/17

$145

sáb. 2/285:30 amBOI - STL

1 stop7h 22mAlaska Airlines

Deal found 9/15

$148

sáb. 2/287:07 amBOI - STL

2 stops8h 27mUnited Airlines

Deal found 9/15

$154

mié. 11/56:35 amGEG - STL

2 stops8h 45mSouthwest

Deal found 9/16

$154

sáb. 11/156:05 amGEG - STL

2 stops8h 44mDelta

Deal found 9/17

$155

vie. 2/272:45 pmBOI - STL

1 stop8h 11mAlaska Airlines

Deal found 9/15

$158

jue. 10/212:22 pmBOI - STL

1 stop19h 44mFrontier

Deal found 9/14

$170

dom. 1/46:00 amGEG - STL

1 stop7h 10mDelta

Deal found 9/15

$214

lun. 9/292:25 pmSUN - STL

1 stop5h 21mUnited Airlines

Deal found 9/16

$226

jue. 10/22:16 pmBOI - STL

2 stops17h 50mMultiple Airlines

Deal found 9/14

$227

Fly from

Fly to

Route

Depart

Return

Price

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

jue. 11/13

9:16 pm-1:57 pm

1 stop14h 41m

Lambert-St Louis

sáb. 11/15

7:45 pm-11:08 am

1 stop17h 23m

$234

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

jue. 12/4

12:23 pm-10:02 am

1 stop19h 39m

Lambert-St Louis

sáb. 12/6

7:43 pm-11:28 am

1 stop17h 45m

$249

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

mar. 10/14

9:22 am-12:24 am

2 stops13h 02m

Lambert-St Louis

mié. 10/29

6:00 am-2:57 pm

2 stops10h 57m

$282

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jue. 12/11

6:44 am-4:36 pm

1 stop8h 52m

Lambert-St Louis

mar. 12/23

5:16 pm-10:56 pm

1 stop6h 40m

$287

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

jue. 10/30

1:20 pm-11:59 pm

1 stop8h 39m

Lambert-St Louis

mar. 11/4

7:00 am-12:26 pm

1 stop7h 26m

$290

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

jue. 10/9

4:00 pm-11:58 pm

1 stop5h 58m

Lambert-St Louis

mié. 10/15

6:30 am-11:42 am

1 stop7h 12m

$291

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

mar. 10/14

5:05 am-6:40 pm

2 stops11h 35m

Lambert-St Louis

mar. 10/21

6:50 am-12:01 pm

1 stop7h 11m

$300

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

mié. 11/5

6:10 am-6:45 pm

2 stops10h 35m

Lambert-St Louis

jue. 11/6

6:00 am-11:41 am

1 stop7h 41m

$300

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

dom. 10/5

12:22 pm-9:06 am

1 stop19h 44m

Lambert-St Louis

mié. 10/8

7:52 pm-11:43 am

1 stop16h 51m

$302

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

mar. 11/11

4:43 pm-12:46 am

1 stop6h 03m

Lambert-St Louis

vie. 11/14

6:50 am-2:54 pm

2 stops10h 04m

$306

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 53 results

...

Best time to book a flight from Idaho to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Idaho with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Idaho to St. Louis

What is the cheapest month to book a flight from Idaho to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Idaho to St. Louis (average of $311). Flying from Idaho to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ID to STL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Idaho to St. Louis as you normally would.

Related info for your journey

What airport do you fly into for flights to St. Louis from Idaho?
Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to St. Louis from Idaho.
How long is the flight from Idaho to St. Louis?
There are many flights that can get you from Idaho to St. Louis in 8h 52m. Fly via Frontier, Delta, or American Airlines to get the fastest option. Idaho and St. Louis are separated by a distance of 1378 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines to fly from Idaho to St. Louis one-way?
To fly one-way, consider booking your trip with Hawaiian Airlines, which is currently one of the cheapest options available, starting at $141. Alaska Airlines flights start at $142 while deals on United Airlines start at $154 one-way.
What are the most popular routes from Idaho to St. Louis?
When deciding which route to take from Idaho to St. Louis consider Spokane - Lambert-St Louis, Boise Air Term. Gowen Fld - Lambert-St Louis or Idaho Falls Fanning Field - Lambert-St Louis as they are the most popular.
Can I find deals for flights from Idaho to St. Louis that include hotel bookings?
Yes. In addition to deals on Idaho to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Idaho to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Idaho to St. Louis.
Can I find deals for business class flights from Idaho to St. Louis?
Yes. Cheapflights offers flight deals from Idaho to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Idaho to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Idaho to St. Louis (average of $311). Flying from Idaho to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Edwardsville

O'Fallon

Fairview Heights

Maryland Heights

Collinsville

Eureka

Glencoe

St. Peters

Chesterfield

Alton

Farmington

Festus

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Top 5 airlines flying from Idaho to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
Delta	Cheapest$209	Average$435	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$226	Average$373	FlexibilityNo cancel fee	On-time71%
Alaska Airlines	Cheapest$278	Average$488	FlexibilityNo cancel fee	On-time75%
Southwest	Cheapest$286	Average$449	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$286	Average$607	FlexibilityNo cancel fee	On-time69%

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$141+ Cheap flights from Idaho to St. Louis (STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/1. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from Idaho to St. Louis

Keep the following information in mind while searching for Idaho to St. Louis flight deals. Data was last updated septiembre 17, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Idaho to St. Louis

Cheapest flights from Idaho to St. LouisExplore the most affordable flight options available from Idaho to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 17, 2025.

Explore the most affordable flight options available from Idaho to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 17, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Idaho to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Idaho with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Idaho to St. Louis

What is the cheapest month to book a flight from Idaho to St. Louis?

What is the cheapest time of day to fly from ID to STL?

Find hourly flight availability from Idaho to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 17, 2025.

Related info for your journey

Find useful and relevant information for your journey from Idaho to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to St. Louis from Idaho?

How long is the flight from Idaho to St. Louis?

What are the cheapest airlines to fly from Idaho to St. Louis one-way?

What are the most popular routes from Idaho to St. Louis?

Can I find deals for flights from Idaho to St. Louis that include hotel bookings?

How can I find direct flights from Idaho to St. Louis?

Can I find deals for business class flights from Idaho to St. Louis?

What is the cheapest month to book a flight from Idaho to St. Louis?

Traveling to a place near St. Louis?

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Alternative routes for Idaho to St. Louis

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Top 5 airlines flying from Idaho to St. Louis

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Cheapest flights from Idaho to St. Louis
Explore the most affordable flight options available from Idaho to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 17, 2025.