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$139+ 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
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
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 July 3, 2025.

Round-trip from

$278
(Hawaiian Airlines)

One-way from

$139
(Hawaiian Airlines)

Popular in

November

Cheapest in

April

Average price

$426
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. 1% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 3, 2025.

This Hawaiian Airlines deal was found by Cheapflights users on 7/3. 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 stop9h 33mHawaiian Airlines
Sat 9/206:35 amBOI - STL
1 stop7h 06mHawaiian Airlines
Deal found 7/3$278
This Southwest deal was found by Cheapflights users on 7/2. 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.
Wed 7/306:25 pmSTL - BOI
1 stop7h 00mSouthwest
Wed 8/66:00 amBOI - STL
1 stop8h 00mSouthwest
Deal found 7/2$279
This American Airlines deal was found by Cheapflights users on 7/1. 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 8/97:53 amSTL - BOI
1 stop6h 27mAmerican Airlines
Sat 8/165:15 pmBOI - STL
1 stop6h 01mAmerican Airlines
Deal found 7/1$283
This United Airlines deal was found by Cheapflights users on 7/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/125:15 amSTL - BOI
1 stop5h 31mUnited Airlines
Tue 8/192:13 pmBOI - STL
2 stops8h 40mUnited Airlines
Deal found 7/2$284
This Delta deal was found by Cheapflights users on 7/3. 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 9/137:40 amSTL - BOI
2 stops11h 36mDelta
Sat 9/203:20 pmBOI - STL
1 stop6h 49mDelta
Deal found 7/3$342
This Alaska Airlines deal was found by Cheapflights users on 7/2. 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.
Sun 9/146:00 amSTL - BOI
1 stop10h 00mAlaska Airlines
Wed 9/174:00 pmBOI - STL
2 stops30h 59mAlaska Airlines
Deal found 7/2$356
This Justfly.com deal was found by Cheapflights users on 7/2. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/167:29 pmSTL - BOI
1 stop17h 17mFrontier
Sun 7/2012:36 pmBOI - STL
1 stop19h 35mFrontier
Deal found 7/2$358
This Mytrip deal was found by Cheapflights users on 7/2. 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.
Wed 7/1611:24 amSTL - BOI
3 stops30h 08mMultiple Airlines
Mon 7/217:48 pmBOI - STL
3 stops15h 22mMultiple Airlines
Deal found 7/2$469

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 July 3, 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

Sat 9/13

3:35 pm-12:08 am

1 stop9h 33m

Boise Air Term. Gowen Fld

Sat 9/20

6:35 am-2:41 pm

1 stop7h 06m

$278

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 7/30

6:25 pm-12:25 am

1 stop7h 00m

Boise Air Term. Gowen Fld

Wed 8/6

6:00 am-3:00 pm

1 stop8h 00m

$279

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 8/9

7:53 am-1:20 pm

1 stop6h 27m

Boise Air Term. Gowen Fld

Sat 8/16

5:15 pm-12:16 am

1 stop6h 01m

$283

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 8/12

5:15 am-9:46 am

1 stop5h 31m

Boise Air Term. Gowen Fld

Tue 8/19

2:13 pm-11:53 pm

2 stops8h 40m

$284

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 9/13

7:40 am-6:16 pm

2 stops11h 36m

Boise Air Term. Gowen Fld

Sat 9/20

3:20 pm-11:09 pm

1 stop6h 49m

$342

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sun 9/14

6:00 am-3:00 pm

1 stop10h 00m

Boise Air Term. Gowen Fld

Wed 9/17

4:00 pm-11:59 pm

2 stops30h 59m

$356

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 7/16

7:29 pm-11:46 am

1 stop17h 17m

Boise Air Term. Gowen Fld

Sun 7/20

12:36 pm-9:11 am

1 stop19h 35m

$358

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 7/16

11:24 am-4:32 pm

3 stops30h 08m

Boise Air Term. Gowen Fld

Mon 7/21

7:48 pm-12:10 pm

3 stops15h 22m

$469

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 10/15

6:33 am-1:10 pm

1 stop7h 37m

$139

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 8/6

7:15 pm-12:09 am

1 stop5h 54m

$140

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Showing 1-10 of 15 results
1
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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 June 27, 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 $398). 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 July 3, 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 July 3, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Delta 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

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

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

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
4,266 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

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
7,982 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.8
Good
2,545 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

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
8,861 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Comfort

7.8

Crew

8.5

Boarding

8.1

Overall

8.0

Entertainment

7.1

Food

7.1

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

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, Hawaiian Airlines ($278), Southwest ($279), and American Airlines ($283) offers the cheapest pricing from St. Louis to Boise. Hawaiian Airlines is priced at 33% lower than the current average price of a flight leaving 3 months from now.

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

    To fly one-way, consider booking your trip with Hawaiian Airlines, which is currently one of the cheapest options available, starting at $139. Delta flights start at $140 while deals on Southwest start at $149 one-way.

  • 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 $398). 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
Meridian
Nampa
McCall
Ontario
Caldwell

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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 July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$239Average$366FlexibilityNo cancel feeOn-time71%
DeltaCheapest$286Average$395FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$296Average$457FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$351Average$497FlexibilityNo cancel feeOn-time63%

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