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$75+ 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 11/13. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — STL
Nov 27 — Dec 41
Thu 11/27
Thu 12/4
1 adult, Economy
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1. Tell us where you want to go

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

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 October 28, 2025.

This Frontier deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/412:44 pmBOI - STL
1 stop20h 30mFrontier
Wed 12/107:43 pmSTL - BOI
1 stop17h 06mFrontier
Deal found 10/27$131
This Delta deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/47:30 amBOI - STL
2 stops10h 40mDelta
Wed 12/1012:49 pmSTL - BOI
2 stops8h 31mDelta
Deal found 10/27$284
This Mytrip deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3012:33 pmBOI - STL
1 stop19h 34mFrontier
Sat 11/18:40 pmSTL - BOI
1 stop17h 08mFrontier
Deal found 10/27$291
This Delta deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2511:39 pmBOI - STL
1 stop7h 49mDelta
Tue 12/28:05 pmSTL - BOI
1 stop5h 37mDelta
Deal found 10/26$332
This Delta deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/89:00 amBOI - STL
2 stops9h 10mDelta
Fri 12/122:20 pmSTL - BOI
2 stops10h 44mDelta
Deal found 10/26$334
This Southwest deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/255:00 amBOI - STL
1 stop6h 20mSouthwest
Tue 12/210:25 amSTL - BOI
2 stops7h 45mSouthwest
Deal found 10/26$373
This Delta deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/303:23 pmBOI - STL
1 stop5h 53mDelta
Sun 1/47:20 amSTL - BOI
1 stop5h 42mDelta
Deal found 10/25$384
This Alaska Airlines deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/206:28 amBOI - STL
1 stop16h 31mAlaska Airlines
Sun 11/237:00 amSTL - BOI
1 stop16h 24mAlaska Airlines
Deal found 10/27$394

Cheap flight deals from Boise to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Boise (BOI) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$131
(Frontier)

One-way from

$75
(Gotogate)

Popular in

January

Cheapest in

September

Average price

$401
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. 19% potential increase in price ($105 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 9% potential price decrease ($37 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boise to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 28, 2025.
Use the filters below to find and compare flights from Boise to St. Louis that are best for you.

Fly from

Boise

Fly to

St. Louis

Route

Depart

Return

Price

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 12/4

7:30 am-7:10 pm

2 stops10h 40m

Lambert-St Louis

Wed 12/10

12:49 pm-8:20 pm

2 stops8h 31m

$284

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 11/25

11:39 pm-8:28 am

1 stop7h 49m

Lambert-St Louis

Tue 12/2

8:05 pm-12:42 am

1 stop5h 37m

$332

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 12/8

9:00 am-7:10 pm

2 stops9h 10m

Lambert-St Louis

Fri 12/12

2:20 pm-12:04 am

2 stops10h 44m

$334

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 4/7

6:30 am-2:11 pm

1 stop6h 41m

Lambert-St Louis

Wed 4/8

7:00 am-1:47 pm

1 stop7h 47m

$367

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 11/25

5:00 am-12:20 pm

1 stop6h 20m

Lambert-St Louis

Tue 12/2

10:25 am-5:10 pm

2 stops7h 45m

$373

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 12/30

3:23 pm-10:16 pm

1 stop5h 53m

Lambert-St Louis

Sun 1/4

7:20 am-12:02 pm

1 stop5h 42m

$384

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 11/20

11:43 am-11:59 pm

1 stop11h 16m

Lambert-St Louis

Sun 11/23

7:00 am-11:39 pm

1 stop17h 39m

$394

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Thu 11/13

12:33 pm-9:07 am

1 stop19h 34m

$75

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Sun 11/16

12:28 pm-9:07 am

1 stop19h 39m

$109

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Mon 11/24

5:58 pm-12:46 am

1 stop5h 48m

$147

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/25

Showing 1-10 of 16 results
1
2

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 October.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Boise-St. Louis flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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?

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 October 24, 2025.

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, April is the cheapest month in which you can book a flight from Boise to St. Louis (average of $113). Flying from Boise to St. Louis in January is currently the most expensive (average of $555). 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?

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 October 28, 2025.

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 17% versus a flight in the morning.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated October 28, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta from Boise to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
11,197 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Alaska Airlines
8.0
Very good
11,197 reviews
Alaska Airlines
8.0
Very good
11,197 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Southwest
8.0
Very good
4,236 reviews
Alaska Airlines
8.0
Very good
11,197 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
Delta
7.9
Good
7,996 reviews
Alaska Airlines
8.0
Very good
11,197 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
United Airlines
7.4
Good
8,997 reviews
Alaska Airlines
8.0
Very good
11,197 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.
American Airlines
7.2
Good
11,033 reviews
Alaska Airlines
8.0
Very good
11,197 reviews

Comfort

7.8

Crew

8.5

Food

7.1

Entertainment

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Sep 2025

BOS - HNL

The flight was awesome but a little long. I would prefer a flight with a layover. The amount of space available was minimal and a little uncomfortable for that long of a flight.

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.

  • How long is the flight from Boise to St. Louis?

    Delta can get you from Boise to St. Louis in just under 10h 40m. Your travel time can differ by up to . Boise and St. Louis are separated by a distance of 1378 mi.

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

    Currently priced at $184, Delta will fly you from Boise to St. Louis and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and Alaska Airlines - these airlines can fly you to your destination from $226 and $278, respectively. You may be able to fly from Boise to St. Louis for 57% less than the average price by searching for these airlines.

  • 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, April is the cheapest month in which you can book a flight from Boise to St. Louis (average of $113). Flying from Boise to St. Louis in January is currently the most expensive (average of $555). 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from Boise to St. Louis

Discover the top 5 airlines that operate flights from Boise to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$209Average$344FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$226Average$362FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$278Average$488FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$286Average$453FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$286Average$424FlexibilityNo cancel feeOn-time69%

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