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$84+ Cheap flights from St. Louis to Boise (STL - BOI)

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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOI
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Lambert-St Louis to Boise Air Term. Gowen Fld are usually found in April or October, booked 75 days in advance, depart on a Wednesday or Monday and return on a Tuesday

Cheap flight deals from St. Louis to Boise

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Boise (BOI). 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 August 14, 2025.

Round-trip from

$250
(Alaska Airlines)

One-way from

$84
(FlightHub)

Popular in

December

Cheapest in

April

Average price

$385
From Lambert-St Louis to Boise Air Term. Gowen Fld
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One-way flight from Lambert-St Louis to Boise Air Term. Gowen Fld
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Highest demand for flights based on searches. 7% potential increase in price ($35 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from St. Louis to Boise

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

This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/217:54 pmSTL - BOI
1 stop16h 44mFrontier
Sun 8/2412:33 pmBOI - STL
1 stop19h 38mFrontier
Deal found 8/14$212
This Alaska Airlines deal was found by Cheapflights users on 8/13. 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.
Tue 9/306:00 amSTL - BOI
1 stop10h 00mAlaska Airlines
Tue 9/305:45 pmBOI - STL
1 stop19h 54mAlaska Airlines
Deal found 8/13$250
This Delta deal was found by Cheapflights users on 8/13. 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.
Wed 9/105:30 pmSTL - BOI
1 stop7h 28mDelta
Wed 9/175:43 pmBOI - STL
1 stop5h 55mDelta
Deal found 8/13$251
This American Airlines deal was found by Cheapflights users on 8/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/315:11 amSTL - BOI
1 stop8h 32mAmerican Airlines
Tue 11/42:06 pmBOI - STL
1 stop8h 44mAmerican Airlines
Deal found 8/13$265
This Alaska Airlines deal was found by Cheapflights users on 8/13. 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.
Fri 9/126:30 pmSTL - BOI
1 stop6h 38mAlaska Airlines
Tue 9/166:35 amBOI - STL
1 stop7h 04mAlaska Airlines
Deal found 8/13$268
This Delta deal was found by Cheapflights users on 8/13. 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.
Sun 8/318:46 amSTL - BOI
1 stop6h 15mDelta
Tue 9/910:45 amBOI - STL
1 stop6h 02mDelta
Deal found 8/13$269
This Southwest deal was found by Cheapflights users on 8/13. 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.
Fri 10/316:05 amSTL - BOI
1 stop5h 20mSouthwest
Tue 11/46:10 amBOI - STL
2 stops10h 10mSouthwest
Deal found 8/13$270
This Hawaiian Airlines deal was found by Cheapflights users on 8/14. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/133:35 pmSTL - BOI
1 stop8h 15mHawaiian Airlines
Mon 9/154:34 pmBOI - STL
1 stop6h 25mHawaiian Airlines
Deal found 8/14$278
This Delta deal was found by Cheapflights users on 8/14. 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.
Sat 9/135:05 pmSTL - BOI
1 stop7h 54mDelta
Sat 9/203:20 pmBOI - STL
1 stop6h 49mDelta
Deal found 8/14$279
This American Airlines deal was found by Cheapflights users on 8/13. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/307:53 amSTL - BOI
1 stop6h 27mAmerican Airlines
Sat 9/67:00 amBOI - STL
1 stop7h 09mAmerican Airlines
Deal found 8/13$283

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Boise 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 August 14, 2025.
Use the filters below to find and compare flights from St. Louis to Boise that are best for you.

Fly from

St. Louis

Fly to

Boise

Route

Depart

Return

Price

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 8/21

7:54 pm-11:38 am

1 stop16h 44m

Boise Air Term. Gowen Fld

Sun 8/24

12:33 pm-9:11 am

1 stop19h 38m

$212

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 9/30

6:00 am-3:00 pm

1 stop10h 00m

Boise Air Term. Gowen Fld

Tue 9/30

5:45 pm-2:39 pm

1 stop19h 54m

$250

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 9/30

3:35 pm-10:50 pm

1 stop8h 15m

Boise Air Term. Gowen Fld

Wed 10/1

8:00 am-5:34 pm

1 stop8h 34m

$250

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 9/10

5:30 pm-11:58 pm

1 stop7h 28m

Boise Air Term. Gowen Fld

Wed 9/17

5:43 pm-12:38 am

1 stop5h 55m

$251

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 10/31

5:11 am-12:43 pm

1 stop8h 32m

Boise Air Term. Gowen Fld

Tue 11/4

2:06 pm-11:50 pm

1 stop8h 44m

$265

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 9/12

6:30 pm-12:08 am

1 stop6h 38m

Boise Air Term. Gowen Fld

Tue 9/16

6:35 am-2:39 pm

1 stop7h 04m

$268

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sun 8/31

8:46 am-2:01 pm

1 stop6h 15m

Boise Air Term. Gowen Fld

Tue 9/9

10:45 am-5:47 pm

1 stop6h 02m

$269

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sun 8/31

8:46 am-2:01 pm

1 stop6h 15m

Boise Air Term. Gowen Fld

Wed 9/3

12:45 pm-9:16 pm

1 stop7h 31m

$269

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 10/31

6:05 am-10:25 am

1 stop5h 20m

Boise Air Term. Gowen Fld

Tue 11/4

6:10 am-5:20 pm

2 stops10h 10m

$270

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 9/13

3:35 pm-10:50 pm

1 stop8h 15m

Boise Air Term. Gowen Fld

Mon 9/15

4:34 pm-11:59 pm

1 stop6h 25m

$278

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Showing 1-10 of 22 results
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Best time to book a flight from St. Louis to Boise

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

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

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Boise. Price data was last updated on August 8, 2025.

The price you pay for your flight from St. Louis to Boise may vary depending on when you book. For the best chance of a lower fare, look to book 75 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, October is the cheapest month in which you can book a flight from St. Louis to Boise (average of $314). Flying from St. Louis to Boise in June is currently the most expensive (average of $399). 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 STL to BOI?

Find hourly flight availability from St. Louis to Boise. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

When flying from St. Louis to Boise, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 12% versus a flight in the afternoon.

Reviews of airlines servicing Boise

Get insights into the airlines that provide service to Boise. 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 Boise. Reviews last updated August 14, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from St. Louis to Boise. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,916 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Crew

8.6

Comfort

8.0

Overall

8.0

Entertainment

7.5

Boarding

8.1

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Boise. 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 St. Louis to Boise round-trip?

    According to our current data, American Airlines ($239), Delta ($278), and United Airlines ($287) offers the cheapest pricing from St. Louis to Boise. American Airlines is priced at 41% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Boise 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 St. Louis to Boise?

    Currently, October is the cheapest month in which you can book a flight from St. Louis to Boise (average of $314). Flying from St. Louis to Boise in June is currently the most expensive (average of $399). 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 Boise?

Book flights to Boise if you plan to visit one of these locations
Ontario
Meridian
Nampa
Caldwell
McCall

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Top 4 airlines flying from St. Louis to Boise

Discover the top 4 airlines that operate flights from St. Louis to Boise. 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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$239Average$366FlexibilityNo cancel feeOn-time71%
DeltaCheapest$278Average$399FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$465FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$292Average$440FlexibilityNo cancel feeOn-time63%

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