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$176+ 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 7/6. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BOI
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
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 junio 12, 2025.

Round-trip from

$254
(Alaska Airlines)

One-way from

$176
(Mytrip)

Popular in

November

Cheapest in

April

Average price

$439
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. 8% potential increase in price ($37 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 junio 12, 2025.

This Alaska Airlines deal was found by Cheapflights users on 6/10. 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.
mar. 9/163:35 pmSTL - BOI
1 stop8h 05mAlaska Airlines
mié. 9/246:35 amBOI - STL
1 stop7h 04mAlaska Airlines
Deal found 6/10$254
This Delta deal was found by Cheapflights users on 6/10. 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.
jue. 9/186:59 pmSTL - BOI
1 stop6h 18mDelta
jue. 9/2511:30 pmBOI - STL
1 stop7h 40mDelta
Deal found 6/10$255
This Southwest deal was found by Cheapflights users on 6/10. 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.
lun. 9/84:00 pmSTL - BOI
2 stops8h 05mSouthwest
lun. 9/154:30 pmBOI - STL
1 stop6h 25mSouthwest
Deal found 6/10$260
This American Airlines deal was found by Cheapflights users on 6/10. 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.
jue. 8/145:15 amSTL - BOI
1 stop8h 31mAmerican Airlines
dom. 8/175:15 pmBOI - STL
1 stop6h 01mAmerican Airlines
Deal found 6/10$271
This Hawaiian Airlines deal was found by Cheapflights users on 6/10. 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.
sáb. 9/133:35 pmSTL - BOI
1 stop8h 05mHawaiian Airlines
sáb. 9/206:35 amBOI - STL
1 stop7h 04mHawaiian Airlines
Deal found 6/10$286
This United Airlines deal was found by Cheapflights users on 6/9. 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.
jue. 8/215:15 amSTL - BOI
2 stops9h 15mUnited Airlines
mar. 8/265:00 amBOI - STL
2 stops8h 33mUnited Airlines
Deal found 6/9$345
This Mytrip deal was found by Cheapflights users on 6/11. 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.
jue. 8/710:47 amSTL - BOI
2 stops33h 05mSpirit Airlines
lun. 8/117:48 pmBOI - STL
2 stops19h 43mSpirit Airlines
Deal found 6/11$377
This Mytrip deal was found by Cheapflights users on 6/11. 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.
jue. 8/710:47 amSTL - BOI
2 stops33h 05mMultiple Airlines
lun. 8/117:48 pmBOI - STL
3 stops19h 57mMultiple Airlines
Deal found 6/11$407

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 junio 12, 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

lun. 9/8

6:30 pm-9:28 am

1 stop15h 58m

Boise Air Term. Gowen Fld

lun. 9/15

4:34 pm-11:59 pm

1 stop6h 25m

$254

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 8/21

6:00 am-12:19 pm

1 stop7h 19m

Boise Air Term. Gowen Fld

mar. 8/26

1:36 pm-11:14 pm

1 stop8h 38m

$255

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

lun. 9/8

4:00 pm-11:05 pm

2 stops8h 05m

Boise Air Term. Gowen Fld

lun. 9/15

4:30 pm-11:55 pm

1 stop6h 25m

$260

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 8/21

7:11 pm-11:59 pm

1 stop5h 48m

Boise Air Term. Gowen Fld

mar. 8/26

5:45 am-5:47 pm

2 stops11h 02m

$280

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 8/21

5:15 am-1:30 pm

2 stops9h 15m

Boise Air Term. Gowen Fld

mar. 8/26

5:00 am-2:33 pm

2 stops8h 33m

$345

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 8/7

10:47 am-6:52 pm

2 stops33h 05m

Boise Air Term. Gowen Fld

lun. 8/11

7:48 pm-4:31 pm

2 stops19h 43m

$377

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

jue. 8/7

10:47 am-6:52 pm

2 stops33h 05m

Boise Air Term. Gowen Fld

lun. 8/11

7:48 pm-4:45 pm

3 stops19h 57m

$407

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

dom. 7/6

6:36 am-4:50 pm

1 stop11h 14m

$176

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

mié. 7/2

1:30 pm-10:29 pm

1 stop9h 59m

$180

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

mié. 7/2

7:29 pm-11:47 am

1 stop17h 18m

$203

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 14 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 9, 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 $395). 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 junio 12, 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 junio 12, 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

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

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

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

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
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

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
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

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
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

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, Alaska Airlines ($254), American Airlines ($255), and Southwest ($260) offers the cheapest pricing from St. Louis to Boise. Alaska Airlines is priced at 39% 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 Sun Country Air, which is currently one of the cheapest options available, starting at $176. Delta flights start at $180 while deals on Frontier start at $203 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 $395). 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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$239Average$422FlexibilityNo cancel feeOn-time71%
DeltaCheapest$286Average$398FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$287Average$456FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$298Average$481FlexibilityNo cancel feeOn-time63%

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