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$211+ 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 7/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOI
Jun 23 — Jun 301
Mon 6/23
Mon 6/30
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 June 18, 2025.

Round-trip from

$279
(American Airlines)

One-way from

$211
(FlightHub)

Popular in

November

Cheapest in

April

Average price

$456
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 ($34 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 June 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 June 18, 2025.

This American Airlines deal was found by Cheapflights users on 6/17. 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.
Tue 7/155:30 amSTL - BOI
1 stop6h 24mAmerican Airlines
Tue 7/223:35 pmBOI - STL
1 stop6h 22mAmerican Airlines
Deal found 6/17$279
This Delta deal was found by Cheapflights users on 6/17. 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 8/217:11 pmSTL - BOI
1 stop5h 48mDelta
Tue 8/2610:45 amBOI - STL
1 stop6h 02mDelta
Deal found 6/17$283
This Hawaiian Airlines deal was found by Cheapflights users on 6/16. 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 05mHawaiian Airlines
Sat 9/206:35 amBOI - STL
1 stop7h 04mHawaiian Airlines
Deal found 6/16$286
This Southwest deal was found by Cheapflights users on 6/16. 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 9/38:15 amSTL - BOI
2 stops10h 05mSouthwest
Sat 9/63:35 pmBOI - STL
1 stop6h 10mSouthwest
Deal found 6/16$288
This United Airlines deal was found by Cheapflights users on 6/15. 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.
Mon 8/255:15 amSTL - BOI
2 stops9h 15mUnited Airlines
Sat 8/302:42 pmBOI - STL
1 stop5h 14mUnited Airlines
Deal found 6/15$292
This Alaska Airlines deal was found by Cheapflights users on 6/16. 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.
Sat 9/133:35 pmSTL - BOI
2 stops16h 45mAlaska Airlines
Sat 9/206:35 amBOI - STL
1 stop7h 04mAlaska Airlines
Deal found 6/16$346
This Mytrip deal was found by Cheapflights users on 6/15. 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.
Mon 9/88:44 amSTL - BOI
3 stops13h 00mSpirit Airlines
Fri 9/129:49 pmBOI - STL
2 stops33h 00mSpirit Airlines
Deal found 6/15$364
This Booking.com deal was found by Cheapflights users on 6/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/27:29 pmSTL - BOI
1 stop17h 18mFrontier
Sun 7/612:36 pmBOI - STL
1 stop19h 35mFrontier
Deal found 6/17$410
This Mytrip deal was found by Cheapflights users on 6/17. 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 7/2410:47 amSTL - BOI
3 stops33h 05mMultiple Airlines
Mon 7/287:48 pmBOI - STL
3 stops19h 57mMultiple Airlines
Deal found 6/17$542

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 June 18, 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

Tue 7/15

5:30 am-10:54 am

1 stop6h 24m

Boise Air Term. Gowen Fld

Tue 7/22

3:35 pm-10:57 pm

1 stop6h 22m

$279

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 8/21

7:11 pm-11:59 pm

1 stop5h 48m

Boise Air Term. Gowen Fld

Tue 8/26

10:45 am-5:47 pm

1 stop6h 02m

$283

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 9/13

3:35 pm-10:40 pm

1 stop8h 05m

Boise Air Term. Gowen Fld

Sat 9/20

6:35 am-2:39 pm

1 stop7h 04m

$286

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 9/3

8:15 am-5:20 pm

2 stops10h 05m

Boise Air Term. Gowen Fld

Sat 9/6

3:35 pm-10:45 pm

1 stop6h 10m

$288

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Mon 8/25

5:15 am-1:30 pm

2 stops9h 15m

Boise Air Term. Gowen Fld

Sat 8/30

2:42 pm-8:56 pm

1 stop5h 14m

$292

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 9/13

3:35 pm-7:20 am

2 stops16h 45m

Boise Air Term. Gowen Fld

Sat 9/20

6:35 am-2:39 pm

1 stop7h 04m

$346

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Mon 9/8

8:44 am-8:44 pm

3 stops13h 00m

Boise Air Term. Gowen Fld

Fri 9/12

9:49 pm-7:49 am

2 stops33h 00m

$364

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 7/2

7:29 pm-11:47 am

1 stop17h 18m

Boise Air Term. Gowen Fld

Sun 7/6

12:36 pm-9:11 am

1 stop19h 35m

$410

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 7/24

10:47 am-6:52 pm

3 stops33h 05m

Boise Air Term. Gowen Fld

Mon 7/28

7:48 pm-4:45 pm

3 stops19h 57m

$542

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 7/2

7:29 pm-11:47 am

1 stop17h 18m

$211

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/17

Showing 1-10 of 13 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 June 13, 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 $396). 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 June 18, 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.

Rainfall in Boise by month

Plan your trip to Boise by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Boise ranges from 0.2 - 1.6 inches per month. December is typically the wettest month, when rainfall can reach 1.6 in. August is typically the driest time to visit Boise when rainfall is around 0.2 in.

Temperature in Boise by month

Plan your trip to Boise by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Boise, 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 75.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 30.2 F).

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 June 18, 2025.
See what other customers who have flown with Alaska Airlines, Southwest and Delta from St. Louis to Boise have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

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

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

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
4,280 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

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
7,964 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

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
2,507 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

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
8,810 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Crew

8.5

Entertainment

7.1

Comfort

7.8

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, American Airlines ($279), Delta ($283), and Hawaiian Airlines ($286) offers the cheapest pricing from St. Louis to Boise. American 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 Frontier, which is currently one of the cheapest options available, starting at $211. American Airlines flights start at $220 while deals on United Airlines start at $285 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 $396). 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
Nampa
Meridian
Ontario
McCall
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 June 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$239Average$422FlexibilityNo cancel feeOn-time71%
DeltaCheapest$286Average$395FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$457FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$351Average$452FlexibilityNo cancel feeOn-time63%

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