What are the cheapest airlines flying from Boise to St. Louis round-trip?

Currently priced at $250, Frontier will fly you from Boise to St. Louis and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and United Airlines - these airlines can fly you to your destination from $283 and $287, respectively. You may be able to fly from Boise to St. Louis for 43% less than the average price by searching for these airlines.

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

The cheapest airlines for a one-way flight from Boise to St. Louis are United Airlines ($144), Delta ($183), and Frontier ($190).

What is the cheapest day to fly from Boise to St. Louis?

Travelers seeking maximum savings on their Boise to St. Louis flight should consider departing on Tuesday afternoons when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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

Before booking your flight from Boise to St. Louis check out the most popular airlines for this route: American Airlines, Alaska Airlines or Delta.

What is the cheapest day to fly round-trip from Boise to St. Louis?

Departing on a Monday is a good option for securing a great price. You can expect to save up to 43% when planning your travel around this day of the week.

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

Users have found that booking a flight from Boise to St. Louis at least 37 days early can save you up to 15% on average compared to booking a flight this week. If booking 37 days before your flight isn’t an option for you, users have found flights from Boise to St. Louis for as little as $184 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $615 for flights departing within the next 3 days.

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

Flights from Boise to St. Louis lean towards being more expensive in January. Prices are generally better when you fly from Boise to St. Louis in April, with the cheapest ticket starting at $113.

Most accurate provider : When it comes to deals on Boise-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boise-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boise-St. Louis flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Boise-St. Louis flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boise-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Boise 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 Boise to St. Louis - Compare & Save Big

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1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

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Cheapflights Tip: The best prices from Boise Air Term. Gowen Fld to Lambert-St Louis are usually found in April or August, booked 36 days in advance, depart on a Tuesday or Friday and return on a Wednesday

Cheap flight deals from Boise to St. Louis

Most accurate provider	FlightHub 3 stars
Most trusted provider	Expedia 3 stars
Round-trip from	$250 (CheapOair)
One-way from	$144 (United Airlines)
Popular in	January
Cheapest in	April
Average price	$390

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 Boise Air Term. Gowen Fld to Lambert-St Louis

Search Deals

One-way flight from Boise Air Term. Gowen Fld to Lambert-St Louis

Search Deals

Highest demand for flights based on searches. 17% potential increase in price ($91 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 May 2025

Search Deals

Find flight deals from Boise to St. Louis

Cheapest flights from Boise to St. Louis
Explore the most affordable flight options available from Boise to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on mai 14, 2025.

jeu. 9/1812:53 pmBOI - STL

1 stop19h 14mFrontier

sam. 9/207:52 pmSTL - BOI

1 stop16h 51mFrontier

Deal found 5/14

$250

mer. 9/173:00 pmBOI - STL

1 stop7h 02mDelta

sam. 9/208:50 amSTL - BOI

1 stop6h 15mDelta

Deal found 5/13

$283

jeu. 6/55:43 pmBOI - STL

1 stop5h 16mUnited Airlines

lun. 6/95:20 amSTL - BOI

1 stop5h 26mUnited Airlines

Deal found 5/13

$287

mer. 9/1711:30 amBOI - STL

2 stops9h 20mSouthwest

sam. 9/205:45 amSTL - BOI

1 stop5h 05mSouthwest

Deal found 5/13

$288

jeu. 6/57:00 amBOI - STL

2 stops16h 04mAlaska Airlines

lun. 6/93:03 pmSTL - BOI

1 stop8h 39mAlaska Airlines

Deal found 5/13

$375

dim. 6/227:26 pmBOI - STL

2 stops21h 52mMultiple Airlines

jeu. 6/269:50 amSTL - BOI

3 stops23h 58mMultiple Airlines

Deal found 5/13

$447

ven. 5/164:35 pmBOI - STL

1 stop6h 29mHawaiian Airlines

lun. 5/197:00 amSTL - BOI

1 stop9h 06mHawaiian Airlines

Deal found 5/13

$812

jeu. 6/51:49 pmBOI - STL

1 stop9h 10mAmerican Airlines

sam. 6/77:20 amSTL - BOI

1 stop8h 25mAmerican Airlines

Deal found 5/13

$867

Best flights from Boise to St. Louis
Discover carefully curated flight deals from Boise to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated mai 14, 2025.

jeu. 9/1812:53 pmBOI - STL

1 stop19h 14mFrontier

sam. 9/207:52 pmSTL - BOI

1 stop16h 51mFrontier

Deal found 5/14

$250

mer. 9/173:00 pmBOI - STL

1 stop7h 02mDelta

sam. 9/208:50 amSTL - BOI

1 stop6h 15mDelta

Deal found 5/13

$283

jeu. 6/55:43 pmBOI - STL

1 stop5h 16mUnited Airlines

lun. 6/95:20 amSTL - BOI

1 stop5h 26mUnited Airlines

Deal found 5/13

$287

mer. 9/1711:30 amBOI - STL

2 stops9h 20mSouthwest

sam. 9/205:45 amSTL - BOI

1 stop5h 05mSouthwest

Deal found 5/13

$288

jeu. 6/57:00 amBOI - STL

2 stops16h 04mAlaska Airlines

lun. 6/93:03 pmSTL - BOI

1 stop8h 39mAlaska Airlines

Deal found 5/13

$375

dim. 6/227:26 pmBOI - STL

2 stops21h 52mMultiple Airlines

jeu. 6/269:50 amSTL - BOI

3 stops23h 58mMultiple Airlines

Deal found 5/13

$447

jeu. 6/51:49 pmBOI - STL

1 stop9h 10mAmerican Airlines

sam. 6/77:20 amSTL - BOI

1 stop8h 25mAmerican Airlines

Deal found 5/13

$867

Last-minute flights from Boise to St. Louis
Discover last-minute flight deals from Boise to St. Louis. Data last updated mai 14, 2025 and is based on user searches.

ven. 5/164:35 pmBOI - STL

1 stop6h 29mHawaiian Airlines

lun. 5/197:00 amSTL - BOI

1 stop9h 06mHawaiian Airlines

Deal found 5/13

$812

jeu. 5/227:18 pmBOI - STL

1 stop4h 41mDelta

mar. 5/276:05 pmSTL - BOI

1 stop7h 17mDelta

Deal found 5/13

$323

jeu. 5/225:43 pmBOI - STL

1 stop5h 16mUnited Airlines

mar. 5/275:00 amSTL - BOI

2 stops9h 32mUnited Airlines

Deal found 5/13

$428

jeu. 6/55:43 pmBOI - STL

1 stop5h 16mUnited Airlines

lun. 6/95:20 amSTL - BOI

1 stop5h 26mUnited Airlines

Deal found 5/13

$287

jeu. 6/57:00 amBOI - STL

2 stops16h 04mAlaska Airlines

lun. 6/93:03 pmSTL - BOI

1 stop8h 39mAlaska Airlines

Deal found 5/13

$375

jeu. 6/51:49 pmBOI - STL

1 stop9h 10mAmerican Airlines

sam. 6/77:20 amSTL - BOI

1 stop8h 25mAmerican Airlines

Deal found 5/13

$867

lun. 6/96:10 pmBOI - STL

1 stop5h 33mDelta

mer. 6/117:15 pmSTL - BOI

1 stop5h 59mDelta

Deal found 5/13

$312

ven. 6/205:05 pmBOI - STL

1 stop7h 15mSouthwest

dim. 6/228:25 pmSTL - BOI

1 stop5h 55mSouthwest

Deal found 5/12

$327

dim. 6/227:26 pmBOI - STL

2 stops21h 52mMultiple Airlines

jeu. 6/269:50 amSTL - BOI

3 stops23h 58mMultiple Airlines

Deal found 5/13

$447

One-way flights from Boise to St. Louis
Search for one-way flight options from Boise to St. Louis. Find affordable one-way fares based on user searches. Data last updated mai 14, 2025.

jeu. 7/177:15 pmBOI - STL

1 stop8h 39mUnited Airlines

Deal found 5/13

$144

jeu. 7/177:45 pmBOI - STL

2 stops11h 49mDelta

Deal found 5/14

$183

dim. 6/112:36 pmBOI - STL

1 stop19h 36mFrontier

Deal found 5/13

$190

sam. 8/91:17 pmBOI - STL

1 stop9h 07mAmerican Airlines

Deal found 5/13

$203

ven. 7/185:50 pmBOI - STL

3 stops39h 02mSpirit Airlines

Deal found 5/14

$251

lun. 6/24:35 pmBOI - STL

1 stop6h 29mHawaiian Airlines

Deal found 5/13

$253

dim. 6/110:55 amBOI - STL

2 stops7h 55mSouthwest

Deal found 5/13

$259

jeu. 7/176:25 pmBOI - STL

3 stops43h 14mMultiple Airlines

Deal found 5/14

$265

Cheapflights Fare Finder

Use the filters below to find and compare flights from Boise 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

jeu. 9/18

12:53 pm-9:07 am

1 stop19h 14m

Lambert-St Louis

sam. 9/20

7:52 pm-11:43 am

1 stop16h 51m

$250

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mer. 9/17

3:00 pm-11:02 pm

1 stop7h 02m

Lambert-St Louis

sam. 9/20

8:50 am-2:05 pm

1 stop6h 15m

$283

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jeu. 6/5

7:07 pm-5:03 am

1 stop8h 56m

Lambert-St Louis

dim. 6/8

5:20 am-9:46 am

1 stop5h 26m

$287

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mer. 9/17

11:30 am-9:50 pm

2 stops9h 20m

Lambert-St Louis

sam. 9/20

5:45 am-9:50 am

1 stop5h 05m

$288

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jeu. 6/5

7:00 am-12:04 am

2 stops16h 04m

Lambert-St Louis

lun. 6/9

3:03 pm-10:42 pm

1 stop8h 39m

$375

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

dim. 6/22

7:26 pm-6:18 pm

2 stops21h 52m

Lambert-St Louis

jeu. 6/26

9:50 am-8:48 am

3 stops23h 58m

$447

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jeu. 6/5

1:49 pm-11:59 pm

1 stop9h 10m

Lambert-St Louis

sam. 6/7

7:20 am-2:45 pm

1 stop8h 25m

$867

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jeu. 7/17

7:15 pm-4:54 am

1 stop8h 39m

$144

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jeu. 7/17

7:45 pm-8:34 am

2 stops11h 49m

$183

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

dim. 6/1

12:36 pm-9:12 am

1 stop19h 36m

$190

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/13

Showing 1-10 of 15 results

Compare providers for flights from Boise to St. Louis

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boise to St. Louis in May.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Boise-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Boise-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Boise-St. Louis flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Boise-St. Louis flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Boise-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Boise 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 Boise to St. Louis

How far ahead should I book a flight from Boise to St. Louis?

To ensure you get the cheapest price possible for a flight from Boise to St. Louis, you should look to book at least 36 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from Boise to St. Louis (average of $311). Flying from Boise 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 BOI to STL?

When flying from Boise to St. Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 18% versus a flight in the morning.

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

Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from Boise to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

10,000 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

10,000 reviews

Alaska Airlines

8.0

Very good

10,000 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

4,290 reviews

Alaska Airlines

8.0

Very good

10,000 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

7,946 reviews

Alaska Airlines

8.0

Very good

10,000 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

2,434 reviews

Alaska Airlines

8.0

Very good

10,000 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

8,730 reviews

Alaska Airlines

8.0

Very good

10,000 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 are the cheapest airlines flying from Boise to St. Louis round-trip?
Currently priced at $250, Frontier will fly you from Boise to St. Louis and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and United Airlines - these airlines can fly you to your destination from $283 and $287, respectively. You may be able to fly from Boise to St. Louis for 43% less than the average price by searching for these airlines.
What are the cheapest airlines to fly from Boise to St. Louis one-way?
The cheapest airlines for a one-way flight from Boise to St. Louis are United Airlines ($144), Delta ($183), and Frontier ($190).
Can I find deals for flights from Boise to St. Louis that include hotel bookings?
Yes. In addition to deals on Boise to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Boise to St. Louis?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Boise to St. Louis.
Can I find deals for business class flights from Boise to St. Louis?
Yes. Cheapflights offers flight deals from Boise 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 Boise to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Boise to St. Louis (average of $311). Flying from Boise 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

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Other flights to St. Louis

Top 5 airlines flying from Boise to St. Louis

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$226	Average$391	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$226	Average$366	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$292	Average$430	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$320	Average$463	FlexibilityNo cancel fee	On-time63%
Alaska Airlines	Cheapest$353	Average$447	FlexibilityNo cancel fee	On-time75%

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$144+ Cheap flights from Boise to St. Louis (BOI - 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 7/17. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Boise to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Boise Air Term. Gowen Fld to Lambert-St Louis are usually found in April or August, booked 36 days in advance, depart on a Tuesday or Friday and return on a Wednesday

Cheap flight deals from Boise to St. Louis

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Boise to St. Louis

Cheapest flights from Boise to St. LouisExplore the most affordable flight options available from Boise to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on mai 14, 2025.

Explore the most affordable flight options available from Boise to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on mai 14, 2025.

Cheapflights Fare Finder

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

Compare providers for flights from Boise to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Boise to St. Louis in May.

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

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

Cheapflights Insights

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

How far ahead should I book a flight from Boise to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Boise to St. Louis. Price data was last updated on May 9, 2025.

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

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

Find hourly flight availability from Boise 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 mai 14, 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

Get a feel of what it's like to fly with Alaska Airlines, Southwest and Delta from Boise to St. Louis by reading reviews from past customers. 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 Boise 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 are the cheapest airlines flying from Boise to St. Louis round-trip?

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

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

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

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

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

Traveling to a place near Boise?

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Alternative routes for Boise to St. Louis

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Top 5 airlines flying from Boise to St. Louis

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Cheapest flights from Boise to St. Louis
Explore the most affordable flight options available from Boise to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on mai 14, 2025.