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

To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $150. Delta flights start at $154 while deals on United Airlines start at $238 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 Boise Air Term. Gowen Fld - Lambert-St Louis, Spokane - 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.

How far in advance should I book a flight from Idaho to St. Louis?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 37 days in advance, which can save you up to 199% on flights from Idaho to St. Louis compared to booking the week you need them. Waiting 37 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $476. For sooner than that we have options available in the next 3 days from $676.

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

August is one of the best times of the year to fly to St. Louis from Idaho. Prices for August average $462 per person but you can even find prices for as low as $200. The most expensive prices can be found in the month of January. Opting for a August flight can save you 79% on your journey compared to booking in January

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.

$150+ Flights from Idaho to St. Louis

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Cheap flight deals from Idaho to St. Louis

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$294 (Delta)
One-way from	$150 (American Airlines)
Popular in	January
Cheapest in	August
Average price	$367

Provider with most accurate pricing for Boise Air Term. Gowen Fld-Lambert-St Louis flight deals.

Search Deals

Provider most trusted by Cheapflights users for Boise Air Term. Gowen Fld-Lambert-St Louis flights.

Search Deals

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. 13% potential increase in price ($70 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 7% potential price decrease ($34 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 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 April 1, 2025.

Wed 6/117:27 pmGEG - STL

2 stops13h 07mDelta

Tue 6/177:15 amSTL - GEG

2 stops9h 30mDelta

Deal found 3/31

$294

Sun 6/112:36 pmBOI - STL

1 stop19h 36mFrontier

Mon 6/27:24 pmSTL - BOI

1 stop17h 23mFrontier

Deal found 3/31

$296

Wed 5/73:18 pmGEG - STL

1 stop6h 40mAmerican Airlines

Sat 5/178:05 amSTL - GEG

1 stop7h 32mAmerican Airlines

Deal found 3/31

$303

Sun 4/275:59 pmBOI - STL

1 stop5h 43mDelta

Fri 5/25:34 pmSTL - BOI

1 stop7h 29mDelta

Deal found 4/1

$333

Thu 5/15:55 pmJAC - STL

1 stop5h 47mDelta

Tue 5/67:40 amSTL - JAC

1 stop5h 39mDelta

Deal found 3/31

$337

Fri 7/181:17 pmBOI - STL

1 stop6h 06mAmerican Airlines

Tue 7/227:42 amSTL - BOI

1 stop6h 36mAmerican Airlines

Deal found 3/31

$372

Tue 5/62:43 pmBOI - STL

1 stop5h 18mUnited Airlines

Thu 5/88:48 amSTL - BOI

1 stop5h 49mUnited Airlines

Deal found 3/31

$385

Wed 6/43:02 pmJAC - STL

1 stop6h 44mAmerican Airlines

Mon 6/97:20 amSTL - JAC

1 stop6h 04mAmerican Airlines

Deal found 3/31

$402

Tue 4/156:00 amGEG - STL

1 stop6h 15mAlaska Airlines

Sat 4/196:44 amSTL - GEG

1 stop7h 50mAlaska Airlines

Deal found 3/31

$406

Fri 7/186:30 pmBOI - STL

1 stop6h 25mSouthwest

Wed 7/235:35 pmSTL - BOI

2 stops8h 05mSouthwest

Deal found 3/31

$408

Tue 4/151:40 pmGEG - STL

1 stop6h 10mUnited Airlines

Sat 4/1910:40 amSTL - GEG

2 stops12h 46mUnited Airlines

Deal found 3/31

$412

Wed 6/41:46 pmJAC - STL

1 stop6h 02mUnited Airlines

Mon 6/95:00 amSTL - JAC

2 stops9h 48mUnited Airlines

Deal found 3/31

$422

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 April 1, 2025.

Wed 6/117:27 pmGEG - STL

2 stops13h 07mDelta

Tue 6/177:15 amSTL - GEG

2 stops9h 30mDelta

Deal found 3/31

$294

Sun 6/112:36 pmBOI - STL

1 stop19h 36mFrontier

Mon 6/27:24 pmSTL - BOI

1 stop17h 23mFrontier

Deal found 3/31

$296

Wed 5/73:18 pmGEG - STL

1 stop6h 40mAmerican Airlines

Sat 5/178:05 amSTL - GEG

1 stop7h 32mAmerican Airlines

Deal found 3/31

$303

Tue 5/62:43 pmBOI - STL

1 stop5h 18mUnited Airlines

Thu 5/88:48 amSTL - BOI

1 stop5h 49mUnited Airlines

Deal found 3/31

$385

Tue 4/156:00 amGEG - STL

1 stop6h 15mAlaska Airlines

Sat 4/196:44 amSTL - GEG

1 stop7h 50mAlaska Airlines

Deal found 3/31

$406

Fri 7/186:30 pmBOI - STL

1 stop6h 25mSouthwest

Wed 7/235:35 pmSTL - BOI

2 stops8h 05mSouthwest

Deal found 3/31

$408

Wed 4/161:52 pmBOI - STL

3 stops29h 18mMultiple Airlines

Sun 4/206:10 pmSTL - BOI

2 stops19h 47mMultiple Airlines

Deal found 4/1

$456

Wed 4/164:11 pmIDA - STL

1 stop6h 48mHawaiian Airlines

Sun 4/206:44 amSTL - IDA

1 stop9h 50mHawaiian Airlines

Deal found 3/31

$460

Sun 4/2711:30 pmBOI - STL

1 stop9h 06mDelta

Fri 5/25:34 pmSTL - BOI

1 stop7h 29mDelta

Deal found 3/31

$333

Thu 5/15:55 pmJAC - STL

1 stop5h 47mDelta

Tue 5/67:40 amSTL - JAC

1 stop5h 39mDelta

Deal found 3/31

$337

Fri 7/181:17 pmBOI - STL

1 stop6h 06mAmerican Airlines

Tue 7/227:42 amSTL - BOI

1 stop6h 36mAmerican Airlines

Deal found 3/31

$372

Tue 4/151:40 pmGEG - STL

1 stop6h 10mUnited Airlines

Sat 4/1910:40 amSTL - GEG

2 stops12h 46mUnited Airlines

Deal found 3/31

$412

Last-minute flights from Idaho to St. Louis
Discover last-minute flight deals from Idaho to St. Louis. Data last updated April 1, 2025 and is based on user searches.

Sun 4/68:00 amSUN - STL

2 stops12h 50mUnited Airlines

Sat 4/126:30 amSTL - SUN

2 stops8h 05mUnited Airlines

Deal found 3/31

$767

Mon 4/77:30 amSUN - STL

1 stop4h 49mDelta

Thu 4/107:40 amSTL - SUN

1 stop5h 28mDelta

Deal found 3/31

$685

Mon 4/710:25 amSUN - STL

2 stops10h 47mAlaska Airlines

Tue 4/82:27 pmSTL - SUN

2 stops20h 16mAlaska Airlines

Deal found 3/31

$1,069

Thu 4/109:36 amGEG - STL

1 stop12h 23mAlaska Airlines

Sun 4/133:11 pmSTL - GEG

1 stop7h 50mAlaska Airlines

Deal found 3/31

$728

Thu 4/107:17 amLWS - STL

2 stops9h 13mDelta

Sat 4/127:40 amSTL - LWS

1 stop6h 10mDelta

Deal found 4/1

$762

Thu 4/106:35 amGEG - STL

2 stops9h 55mSouthwest

Sat 4/125:35 amSTL - GEG

1 stop5h 45mSouthwest

Deal found 3/31

$803

Tue 4/156:00 amGEG - STL

1 stop6h 15mAlaska Airlines

Sat 4/196:44 amSTL - GEG

1 stop7h 50mAlaska Airlines

Deal found 3/31

$406

Tue 4/151:40 pmGEG - STL

1 stop6h 10mUnited Airlines

Sat 4/1910:40 amSTL - GEG

2 stops12h 46mUnited Airlines

Deal found 3/31

$412

Tue 4/154:11 pmIDA - STL

1 stop6h 48mAlaska Airlines

Sat 4/193:11 pmSTL - IDA

1 stop8h 24mAlaska Airlines

Deal found 3/30

$461

Tue 4/154:15 pmIDA - STL

1 stop23h 16mUnited Airlines

Sat 4/198:00 amSTL - IDA

2 stops8h 21mUnited Airlines

Deal found 3/30

$543

Wed 4/166:37 amBOI - STL

1 stop6h 38mAlaska Airlines

Sun 4/206:44 amSTL - BOI

1 stop6h 48mAlaska Airlines

Deal found 4/1

$396

Wed 4/165:00 amBOI - STL

2 stops8h 42mUnited Airlines

Sun 4/208:48 amSTL - BOI

1 stop5h 44mUnited Airlines

Deal found 4/1

$402

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 April 1, 2025.

Wed 5/75:10 pmBOI - STL

1 stop5h 48mAmerican Airlines

Deal found 4/1

$150

Fri 6/135:00 pmGEG - STL

1 stop5h 36mDelta

Deal found 4/1

$154

Mon 6/25:40 pmBOI - STL

1 stop6h 19mDelta

Deal found 3/31

$167

Sat 6/75:00 amIDA - STL

2 stops9h 30mUnited Airlines

Deal found 4/1

$238

Sat 6/77:00 amIDA - STL

1 stop6h 28mAmerican Airlines

Deal found 3/31

$239

Sun 8/315:30 pmJAC - STL

1 stop6h 08mDelta

Deal found 4/1

$240

Mon 6/27:07 pmBOI - STL

2 stops24h 41mUnited Airlines

Deal found 3/31

$274

Sat 6/712:55 pmIDA - STL

1 stop7h 37mDelta

Deal found 4/1

$284

Sun 8/317:00 amJAC - STL

2 stops7h 44mUnited Airlines

Deal found 3/31

$326

Thu 4/106:37 amBOI - STL

1 stop6h 38mHawaiian Airlines

Deal found 3/31

$328

Wed 4/3012:30 pmLWS - STL

1 stop6h 33mDelta

Deal found 3/31

$383

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Wed 6/11

7:27 pm-10:34 am

2 stops13h 07m

Lambert-St Louis

Tue 6/17

7:15 am-2:45 pm

2 stops9h 30m

$294

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 6/1

12:36 pm-9:12 am

1 stop19h 36m

Lambert-St Louis

Mon 6/2

7:24 pm-11:47 am

1 stop17h 23m

$296

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Wed 5/7

3:18 pm-11:58 pm

1 stop6h 40m

Lambert-St Louis

Sat 5/17

8:05 am-1:37 pm

1 stop7h 32m

$303

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 4/27

11:30 pm-9:36 am

1 stop9h 06m

Lambert-St Louis

Fri 5/2

5:34 pm-12:03 am

1 stop7h 29m

$333

JacksonSt. Louis

JAC - STL

JACSTL

Jackson Hole

Thu 5/1

5:55 pm-12:42 am

1 stop5h 47m

Lambert-St Louis

Tue 5/6

7:40 am-12:19 pm

1 stop5h 39m

$337

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 7/18

1:17 pm-8:23 pm

1 stop6h 06m

Lambert-St Louis

Tue 7/22

7:42 am-1:18 pm

1 stop6h 36m

$372

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/6

2:43 pm-9:01 pm

1 stop5h 18m

Lambert-St Louis

Thu 5/8

8:48 am-1:37 pm

1 stop5h 49m

$385

JacksonSt. Louis

JAC - STL

JACSTL

Jackson Hole

Wed 6/4

3:02 pm-10:46 pm

1 stop6h 44m

Lambert-St Louis

Mon 6/9

7:20 am-12:24 pm

1 stop6h 04m

$402

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Tue 4/15

6:00 am-2:15 pm

1 stop6h 15m

Lambert-St Louis

Sat 4/19

6:44 am-12:34 pm

1 stop7h 50m

$406

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Fri 7/18

6:30 pm-1:55 am

1 stop6h 25m

Lambert-St Louis

Wed 7/23

5:35 pm-12:40 am

2 stops8h 05m

$408

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/1

Showing 1-10 of 32 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.

Rainfall in St. Louis by month

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.

Temperature in St. Louis by month

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).

Reviews of airlines servicing St. Louis

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Idaho to St. Louis to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,820 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Alaska Airlines

8.0

Very good

9,820 reviews

Alaska Airlines

8.0

Very good

9,820 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Southwest

8.0

Very good

4,277 reviews

Alaska Airlines

8.0

Very good

9,820 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Delta

8.0

Very good

7,898 reviews

Alaska Airlines

8.0

Very good

9,820 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Hawaiian Airlines

7.9

Good

2,345 reviews

Alaska Airlines

8.0

Very good

9,820 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

United Airlines

7.4

Good

8,615 reviews

Alaska Airlines

8.0

Very good

9,820 reviews

Reviews

1 / 20

10.0

Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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.
What are the cheapest airlines to fly from Idaho to St. Louis one-way?
To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $150. Delta flights start at $154 while deals on United Airlines start at $238 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 Boise Air Term. Gowen Fld - Lambert-St Louis, Spokane - 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

Fenton

Maryland Heights

Fairview Heights

Collinsville

Wentzville

Eureka

St. Peters

Festus

Glencoe

Alton

Farmington

Chesterfield

Browse thousands of different options on Cheapflights for your next trip

Top 5 airlines flying from Idaho to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$226	Average$406	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$226	Average$514	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$320	Average$675	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$346	Average$454	FlexibilityNo cancel fee	On-time63%
Alaska Airlines	Cheapest$353	Average$463	FlexibilityNo cancel fee	On-time75%

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$150+ 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Idaho to St. Louis with Cheapflights

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3. Compare prices and book

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 April 1, 2025.

Most accurate provider

Most trusted provider

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 April 1, 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 April 1, 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 April 1, 2025.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

Reviews of airlines servicing St. Louis

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Idaho to St. Louis to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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 Idaho?

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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 April 1, 2025.