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

To fly one-way, consider booking your trip with Delta, which is currently one of the cheapest options available, starting at $144. Hawaiian Airlines flights start at $153 while deals on United Airlines start at $159 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?

April is one of the best times of the year to fly to St. Louis from Idaho. Prices for April average $452 per person but you can even find prices for as low as $113. The most expensive prices can be found in the month of January. Opting for a April flight can save you 83% 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.

$144+ 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	eDreams 3 stars
Round-trip from	$227 (CheapOair)
One-way from	$144 (Delta)
Popular in	January
Cheapest in	April
Average price	$342

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. 15% potential increase in price ($80 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 8% potential price decrease ($35 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 30, 2025.

Sun 6/112:36 pmBOI - STL

1 stop19h 36mFrontier

Wed 6/48:11 pmSTL - BOI

1 stop16h 36mFrontier

Deal found 4/28

$227

Wed 6/2511:40 pmBOI - STL

1 stop9h 03mDelta

Mon 6/307:15 pmSTL - BOI

1 stop4h 56mDelta

Deal found 4/29

$287

Thu 6/52:35 pmBOI - STL

1 stop5h 13mUnited Airlines

Sat 6/75:00 amSTL - BOI

2 stops9h 32mUnited Airlines

Deal found 4/28

$292

Tue 7/12:22 pmGEG - STL

1 stop7h 05mDelta

Tue 7/297:15 amSTL - GEG

1 stop6h 41mDelta

Deal found 4/29

$299

Thu 8/76:00 amGEG - STL

1 stop8h 51mAmerican Airlines

Tue 8/125:52 pmSTL - GEG

1 stop7h 03mAmerican Airlines

Deal found 4/29

$303

Wed 5/144:10 pmGEG - STL

1 stop5h 48mUnited Airlines

Fri 5/164:45 pmSTL - GEG

1 stop6h 05mUnited Airlines

Deal found 4/29

$307

Sun 6/16:50 pmIDA - STL

1 stop5h 09mDelta

Wed 6/117:15 pmSTL - IDA

1 stop4h 40mDelta

Deal found 4/29

$337

Tue 5/135:10 pmBOI - STL

1 stop5h 48mAmerican Airlines

Tue 5/205:19 amSTL - BOI

1 stop8h 26mAmerican Airlines

Deal found 4/29

$344

Tue 5/131:25 pmGEG - STL

1 stop8h 34mAlaska Airlines

Thu 5/156:22 pmSTL - GEG

1 stop7h 32mAlaska Airlines

Deal found 4/28

$374

Thu 6/55:05 pmBOI - STL

1 stop7h 15mSouthwest

Thu 6/125:25 amSTL - BOI

2 stops8h 10mSouthwest

Deal found 4/29

$432

Thu 7/106:05 pmGEG - STL

2 stops14h 45mSouthwest

Sun 7/135:35 amSTL - GEG

1 stop6h 35mSouthwest

Deal found 4/29

$438

Mon 6/238:25 pmBOI - STL

2 stops11h 53mAlaska Airlines

Sat 6/285:37 amSTL - BOI

1 stop6h 19mAlaska Airlines

Deal found 4/29

$452

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 30, 2025.

Sun 6/112:36 pmBOI - STL

1 stop19h 36mFrontier

Wed 6/48:11 pmSTL - BOI

1 stop16h 36mFrontier

Deal found 4/28

$227

Wed 6/256:10 pmBOI - STL

1 stop5h 33mDelta

Mon 6/307:15 pmSTL - BOI

1 stop4h 56mDelta

Deal found 4/28

$287

Thu 6/52:35 pmBOI - STL

1 stop5h 13mUnited Airlines

Sat 6/75:00 amSTL - BOI

2 stops9h 32mUnited Airlines

Deal found 4/28

$292

Thu 8/76:00 amGEG - STL

1 stop8h 51mAmerican Airlines

Tue 8/125:52 pmSTL - GEG

1 stop7h 03mAmerican Airlines

Deal found 4/29

$303

Tue 5/131:25 pmGEG - STL

1 stop8h 34mAlaska Airlines

Thu 5/156:22 pmSTL - GEG

1 stop7h 32mAlaska Airlines

Deal found 4/28

$374

Thu 6/55:05 pmBOI - STL

1 stop7h 15mSouthwest

Thu 6/125:25 amSTL - BOI

2 stops8h 10mSouthwest

Deal found 4/29

$432

Tue 7/12:22 pmGEG - STL

1 stop7h 05mDelta

Tue 7/297:15 amSTL - GEG

1 stop6h 41mDelta

Deal found 4/29

$299

Mon 6/239:36 amBOI - STL

3 stops46h 14mMultiple Airlines

Sat 6/289:50 amSTL - BOI

3 stops32h 24mMultiple Airlines

Deal found 4/29

$599

Wed 5/144:10 pmGEG - STL

1 stop5h 48mUnited Airlines

Fri 5/164:45 pmSTL - GEG

1 stop6h 05mUnited Airlines

Deal found 4/29

$307

Tue 5/135:10 pmBOI - STL

1 stop5h 48mAmerican Airlines

Tue 5/205:19 amSTL - BOI

1 stop8h 26mAmerican Airlines

Deal found 4/29

$344

Sun 6/16:50 pmIDA - STL

1 stop5h 09mDelta

Wed 6/117:15 pmSTL - IDA

1 stop4h 40mDelta

Deal found 4/29

$337

Thu 7/106:05 pmGEG - STL

2 stops14h 45mSouthwest

Sun 7/135:35 amSTL - GEG

1 stop6h 35mSouthwest

Deal found 4/29

$438

Last-minute flights from Idaho to St. Louis
Discover last-minute flight deals from Idaho to St. Louis. Data last updated April 30, 2025 and is based on user searches.

Tue 4/294:20 pmBOI - STL

1 stop6h 39mHawaiian Airlines

Tue 5/66:30 amSTL - BOI

1 stop8h 17mHawaiian Airlines

Deal found 4/29

$531

Mon 5/56:00 amGEG - STL

1 stop6h 08mHawaiian Airlines

Thu 5/83:08 pmSTL - GEG

1 stop7h 53mHawaiian Airlines

Deal found 4/29

$586

Mon 5/55:29 amGEG - STL

2 stops8h 18mMultiple Airlines

Thu 5/83:08 pmSTL - GEG

1 stop7h 53mMultiple Airlines

Deal found 4/29

$642

Tue 5/65:34 amGEG - STL

1 stop7h 53mAmerican Airlines

Fri 5/93:58 pmSTL - GEG

1 stop6h 55mAmerican Airlines

Deal found 4/29

$401

Tue 5/65:50 amGEG - STL

2 stops9h 55mSouthwest

Fri 5/96:40 pmSTL - GEG

1 stop7h 05mSouthwest

Deal found 4/29

$474

Tue 5/65:29 amGEG - STL

2 stops8h 18mUnited Airlines

Fri 5/96:30 amSTL - GEG

2 stops10h 11mUnited Airlines

Deal found 4/29

$493

Tue 5/612:30 pmLWS - STL

1 stop6h 33mDelta

Fri 5/92:29 pmSTL - LWS

2 stops8h 34mDelta

Deal found 4/29

$1,021

Fri 5/92:00 pmBOI - STL

1 stop7h 45mUnited Airlines

Sat 5/106:30 amSTL - BOI

1 stop6h 44mUnited Airlines

Deal found 4/28

$354

Fri 5/95:10 pmBOI - STL

1 stop5h 48mAmerican Airlines

Mon 5/125:19 amSTL - BOI

1 stop8h 26mAmerican Airlines

Deal found 4/29

$401

Mon 5/125:00 pmLWS - STL

1 stop5h 59mDelta

Thu 8/212:15 pmSTL - LWS

2 stops8h 46mDelta

Deal found 4/28

$526

Tue 5/135:10 pmBOI - STL

1 stop5h 48mAmerican Airlines

Tue 5/205:19 amSTL - BOI

1 stop8h 26mAmerican Airlines

Deal found 4/29

$344

Tue 5/131:25 pmGEG - STL

1 stop8h 34mAlaska Airlines

Thu 5/156:22 pmSTL - GEG

1 stop7h 32mAlaska Airlines

Deal found 4/28

$374

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 30, 2025.

Mon 6/25:40 pmBOI - STL

1 stop6h 19mDelta

Deal found 4/28

$144

Wed 5/143:06 pmGEG - STL

1 stop6h 53mHawaiian Airlines

Deal found 4/29

$153

Sun 6/2911:10 pmGEG - STL

1 stop8h 05mDelta

Deal found 4/28

$154

Wed 5/146:00 amGEG - STL

2 stops13h 01mUnited Airlines

Deal found 4/29

$159

Sat 6/71:51 pmIDA - STL

1 stop8h 28mAmerican Airlines

Deal found 4/29

$164

Sat 6/76:50 pmIDA - STL

2 stops13h 47mDelta

Deal found 4/29

$169

Mon 5/124:20 pmBOI - STL

1 stop6h 39mAlaska Airlines

Deal found 4/29

$179

Fri 5/92:00 pmBOI - STL

1 stop7h 45mUnited Airlines

Deal found 4/28

$180

Fri 6/203:29 pmJAC - STL

1 stop7h 25mAmerican Airlines

Deal found 4/29

$198

Thu 5/81:50 pmBOI - STL

1 stop9h 08mAmerican Airlines

Deal found 4/28

$201

Sun 5/115:34 amGEG - STL

1 stop8h 48mAmerican Airlines

Deal found 4/29

$201

Sun 8/315:30 pmJAC - STL

1 stop6h 08mDelta

Deal found 4/29

$230

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

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

Wed 6/4

8:11 pm-11:47 am

1 stop16h 36m

$227

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 6/25

6:10 pm-12:43 am

1 stop5h 33m

Lambert-St Louis

Mon 6/30

7:15 pm-11:11 pm

1 stop4h 56m

$287

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 6/5

2:35 pm-8:48 pm

1 stop5h 13m

Lambert-St Louis

Sat 6/7

5:00 am-1:32 pm

2 stops9h 32m

$292

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Tue 7/1

2:22 pm-11:27 pm

1 stop7h 05m

Lambert-St Louis

Tue 7/29

7:15 am-11:56 am

1 stop6h 41m

$299

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Thu 8/7

6:00 am-4:51 pm

1 stop8h 51m

Lambert-St Louis

Tue 8/12

5:52 pm-10:55 pm

1 stop7h 03m

$303

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Wed 5/14

4:10 pm-11:58 pm

1 stop5h 48m

Lambert-St Louis

Fri 5/16

4:45 pm-8:50 pm

1 stop6h 05m

$307

Idaho FallsSt. Louis

IDA - STL

IDASTL

Idaho Falls Fanning Field

Sun 6/1

6:50 pm-12:59 am

1 stop5h 09m

Lambert-St Louis

Wed 6/11

7:15 pm-10:55 pm

1 stop4h 40m

$337

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/13

5:10 pm-11:58 pm

1 stop5h 48m

Lambert-St Louis

Tue 5/20

5:19 am-12:45 pm

1 stop8h 26m

$344

SpokaneSt. Louis

GEG - STL

GEGSTL

Spokane

Tue 5/13

1:25 pm-11:59 pm

1 stop8h 34m

Lambert-St Louis

Thu 5/15

6:22 pm-11:54 pm

1 stop7h 32m

$374

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 6/5

5:05 pm-1:20 am

1 stop7h 15m

Lambert-St Louis

Thu 6/12

5:25 am-12:35 pm

2 stops8h 10m

$432

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 35 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

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Alaska Airlines

8.0

Very good

9,961 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Southwest

8.0

Very good

4,295 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Delta

8.0

Very good

7,936 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Hawaiian Airlines

7.9

Good

2,402 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

United Airlines

7.4

Good

8,696 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 Delta, which is currently one of the cheapest options available, starting at $144. Hawaiian Airlines flights start at $153 while deals on United Airlines start at $159 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

O'Fallon

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$391	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$226	Average$532	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$308	Average$659	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$320	Average$458	FlexibilityNo cancel fee	On-time63%
Alaska Airlines	Cheapest$353	Average$447	FlexibilityNo cancel fee	On-time75%

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$144+ 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 6/2. 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 30, 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 30, 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 30, 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 30, 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 30, 2025.