HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Boise

$87+ 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
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Boise with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 September 15, 2025.

Round-trip from

$243
(Kiwi.com)

One-way from

$87
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$382
From Lambert-St Louis to Boise Air Term. Gowen Fld
Search Deals
One-way flight from Lambert-St Louis to Boise Air Term. Gowen Fld
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($29 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 15, 2025.

This Delta deal was found by Cheapflights users on 9/13. 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 11/54:45 pmSTL - BOI
1 stop8h 09mDelta
Mon 11/103:00 pmBOI - STL
1 stop7h 23mDelta
Deal found 9/13$207
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/57:45 pmSTL - BOI
1 stop17h 03mMultiple Airlines
Mon 11/106:22 pmBOI - STL
2 stops37h 45mMultiple Airlines
Deal found 9/13$243
This Southwest deal was found by Cheapflights users on 9/13. 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.
Wed 10/155:40 amSTL - BOI
1 stop7h 10mSouthwest
Tue 10/214:40 pmBOI - STL
1 stop6h 50mSouthwest
Deal found 9/13$277
This Southwest deal was found by Cheapflights users on 9/13. 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.
Wed 11/55:00 amSTL - BOI
1 stop7h 25mSouthwest
Mon 11/105:40 pmBOI - STL
1 stop4h 50mSouthwest
Deal found 9/13$287
This Hawaiian Airlines deal was found by Cheapflights users on 9/15. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/67:00 amSTL - BOI
1 stop9h 12mHawaiian Airlines
Mon 11/106:28 amBOI - STL
1 stop7h 50mHawaiian Airlines
Deal found 9/15$296
This Southwest deal was found by Cheapflights users on 9/13. 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 10/245:35 amSTL - BOI
1 stop5h 10mSouthwest
Tue 10/283:15 pmBOI - STL
1 stop7h 55mSouthwest
Deal found 9/13$312
This Kiwi.com deal was found by Cheapflights users on 9/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1610:17 amSTL - BOI
2 stops26h 26mFrontier
Sun 10/1912:28 pmBOI - STL
1 stop19h 39mFrontier
Deal found 9/14$316

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 September 15, 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

Wed 11/5

4:45 pm-11:54 pm

1 stop8h 09m

Boise Air Term. Gowen Fld

Mon 11/10

3:00 pm-11:23 pm

1 stop7h 23m

$207

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 10/15

5:40 am-11:50 am

1 stop7h 10m

Boise Air Term. Gowen Fld

Tue 10/21

4:40 pm-12:30 am

1 stop6h 50m

$277

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 11/5

5:00 am-11:25 am

1 stop7h 25m

Boise Air Term. Gowen Fld

Mon 11/10

5:40 pm-11:30 pm

1 stop4h 50m

$287

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 11/6

7:00 am-3:12 pm

1 stop9h 12m

Boise Air Term. Gowen Fld

Mon 11/10

6:28 am-3:18 pm

1 stop7h 50m

$296

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Thu 10/16

10:17 am-11:43 am

2 stops26h 26m

Boise Air Term. Gowen Fld

Sun 10/19

12:28 pm-9:07 am

1 stop19h 39m

$316

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Fri 10/24

11:10 am-7:40 pm

2 stops9h 30m

Boise Air Term. Gowen Fld

Tue 10/28

2:35 pm-12:10 am

2 stops8h 35m

$372

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 10/15

7:52 pm-11:43 am

1 stop16h 51m

$87

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 10/8

3:57 pm-11:05 pm

1 stop8h 08m

$120

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Tue 10/7

7:30 pm-11:59 pm

1 stop5h 29m

$139

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Sat 10/11

7:52 pm-11:43 am

1 stop16h 51m

$145

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

Showing 1-10 of 16 results
1
2

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 September 12, 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 September 15, 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 September 15, 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
4,242 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,954 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,929 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Overall

8.0

Food

7.0

Comfort

8.0

Boarding

8.1

Entertainment

7.5

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

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

    For as low as $277, Delta can have you in Boise from St. Louis in 7h 10m. The distance from St. Louis to Boise is about 1378 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    According to our current data, American Airlines ($186), Delta ($286), and United Airlines ($286) offers the cheapest pricing from St. Louis to Boise. American Airlines is priced at 54% 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 $87. Alaska Airlines flights start at $120 while deals on Delta start at $139 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 Boise?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Boise

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Boise flights
St. Louis to Jackson flights
St. Louis to Spokane flights
Springfield to Jackson flights
Kansas City to Spokane flights
Kansas City to Jackson flights
St. Louis to Idaho Falls flights
Springfield to Boise flights
Kansas City to Idaho Falls flights
Springfield to Spokane flights
Kansas City to Hailey flights
St. Louis to Lewiston flights
Springfield to Idaho Falls flights
Kansas City to Pocatello flights
Columbia to Spokane flights
Columbia to West Yellowstone flights
Columbia to Jackson flights
St. Louis to Pocatello flights
Kansas City to West Yellowstone flights
Joplin to Jackson flights
Joplin to Spokane flights
St. Louis to West Yellowstone flights
Springfield to West Yellowstone flights

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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$186Average$366FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$286Average$465FlexibilityNo cancel feeOn-time69%
DeltaCheapest$286Average$392FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$292Average$435FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.