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$85+ Cheap flights from Boise to St. Louis (BOI - STL)

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 10/16. Fares are subject to change and may not be available on all flights or dates of travel.
BOI — STL
oct. 11 — oct. 181
sáb. 10/11
sáb. 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Boise Air Term. Gowen Fld to Lambert-St Louis are usually found in April or December, booked 35 days in advance, depart on a Tuesday or Friday and return on a Wednesday

Cheap flight deals from Boise to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Boise (BOI) to St. Louis (STL). 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 septiembre 11, 2025.

Round-trip from

$207
(United Airlines)

One-way from

$85
(Kiwi.com)

Popular in

January

Cheapest in

April

Average price

$406
From Boise Air Term. Gowen Fld to Lambert-St Louis
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One-way flight from Boise Air Term. Gowen Fld to Lambert-St Louis
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Highest demand for flights based on searches. 16% potential increase in price ($85 potential increase over avg. RT price).
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Cheapest flight prices on average. 8% potential price decrease ($36 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Boise to St. Louis

Cheapest flights from Boise to St. Louis
Explore the most affordable flight options available from Boise to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on septiembre 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/9. 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.
mié. 10/222:39 pmBOI - STL
1 stop5h 07mUnited Airlines
lun. 10/275:29 pmSTL - BOI
1 stop6h 59mUnited Airlines
Deal found 9/9$207
This Delta deal was found by Cheapflights users on 9/10. 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.
sáb. 10/183:00 pmBOI - STL
1 stop7h 07mDelta
lun. 10/207:30 pmSTL - BOI
1 stop5h 29mDelta
Deal found 9/10$220
This Delta deal was found by Cheapflights users on 9/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/35:43 pmBOI - STL
1 stop5h 55mDelta
mar. 10/78:53 amSTL - BOI
1 stop6h 09mDelta
Deal found 9/9$234
This Delta deal was found by Cheapflights users on 9/9. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/75:42 amBOI - STL
1 stop7h 50mDelta
mar. 10/147:30 pmSTL - BOI
1 stop5h 29mDelta
Deal found 9/9$279
This Southwest deal was found by Cheapflights users on 9/10. 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.
mié. 10/223:15 pmBOI - STL
1 stop7h 55mSouthwest
dom. 10/265:35 amSTL - BOI
1 stop5h 15mSouthwest
Deal found 9/10$281
This United Airlines deal was found by Cheapflights users on 9/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/222:12 pmBOI - STL
2 stops8h 46mUnited Airlines
dom. 10/269:00 amSTL - BOI
1 stop5h 29mUnited Airlines
Deal found 9/10$291
This Southwest deal was found by Cheapflights users on 9/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/222:35 pmBOI - STL
2 stops8h 35mSouthwest
lun. 10/274:40 pmSTL - BOI
2 stops9h 00mSouthwest
Deal found 9/9$292
This Hawaiian Airlines deal was found by Cheapflights users on 9/9. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/308:00 amBOI - STL
1 stop8h 34mHawaiian Airlines
mar. 10/76:33 amSTL - BOI
1 stop9h 03mHawaiian Airlines
Deal found 9/9$296
This American Airlines deal was found by Cheapflights users on 9/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/21:57 pmBOI - STL
1 stop9h 02mAmerican Airlines
mar. 10/75:20 amSTL - BOI
1 stop8h 18mAmerican Airlines
Deal found 9/9$304

Cheapflights Fare Finder

 
Customize your flight search to find flights from Boise to St. Louis 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 septiembre 11, 2025.
Use the filters below to find and compare flights from Boise to St. Louis that are best for you.

Fly from

Boise

Fly to

St. Louis

Route

Depart

Return

Price

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mié. 10/22

2:39 pm-8:46 pm

1 stop5h 07m

Lambert-St Louis

lun. 10/27

5:29 pm-11:28 pm

1 stop6h 59m

$207

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

sáb. 10/18

3:00 pm-11:07 pm

1 stop7h 07m

Lambert-St Louis

lun. 10/20

7:30 pm-11:59 pm

1 stop5h 29m

$220

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

vie. 10/3

5:43 pm-12:38 am

1 stop5h 55m

Lambert-St Louis

mar. 10/7

8:53 am-2:02 pm

1 stop6h 09m

$234

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mar. 10/7

5:42 am-2:32 pm

1 stop7h 50m

Lambert-St Louis

mar. 10/14

7:30 pm-11:59 pm

1 stop5h 29m

$279

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mié. 10/22

3:15 pm-12:10 am

1 stop7h 55m

Lambert-St Louis

dom. 10/26

5:35 am-9:50 am

1 stop5h 15m

$281

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

mié. 10/22

2:35 pm-12:10 am

2 stops8h 35m

Lambert-St Louis

lun. 10/27

4:40 pm-12:40 am

2 stops9h 00m

$292

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jue. 10/2

1:57 pm-11:59 pm

1 stop9h 02m

Lambert-St Louis

mar. 10/7

5:20 am-12:38 pm

1 stop8h 18m

$304

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

jue. 10/16

12:28 pm-9:07 am

1 stop19h 39m

$85

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

lun. 12/1

6:15 am-12:39 pm

1 stop5h 24m

$254

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

lun. 12/1

7:45 pm-9:10 am

2 stops12h 25m

$258

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 14 results
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Best time to book a flight from Boise to St. Louis

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

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

Use this chart to determine the optimal time to book a round-trip flight from Boise to St. Louis. Price data was last updated on August 29, 2025.

To ensure you get the cheapest price possible for a flight from Boise to St. Louis, you should look to book at least 35 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from Boise to St. Louis (average of $311). Flying from Boise to St. Louis in March is currently the most expensive (average of $356). 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 BOI to STL?

Find hourly flight availability from Boise to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated septiembre 11, 2025.

When flying from Boise to St. Louis, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 18% versus a flight in the morning.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated septiembre 11, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest, and Delta from Boise to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,248 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Delta
8.0
Very good
7,960 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,937 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Crew

8.5

Boarding

8.1

Entertainment

7.0

Overall

8.0

Food

7.1

Comfort

7.8

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

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

    United Airlines and Delta can get you from Boise to St. Louis in just under 5h 07m. Your travel time can differ by up to 2h. Boise and St. Louis are separated by a distance of 1378 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Currently priced at $209, Delta will fly you from Boise to St. Louis and back. In addition to Delta, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and Alaska Airlines - these airlines can fly you to your destination from $226 and $278, respectively. You may be able to fly from Boise to St. Louis for 52% less than the average price by searching for these airlines.

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

    The cheapest airlines for a one-way flight from Boise to St. Louis are Frontier ($85), United Airlines ($254), and Delta ($258).

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Boise to St. Louis (average of $311). Flying from Boise to St. Louis in March is currently the most expensive (average of $356). 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
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from Boise to St. Louis

Discover the top 5 airlines that operate flights from Boise to St. Louis. 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 septiembre 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$209Average$359FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$226Average$362FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$278Average$488FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$286Average$448FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$286Average$424FlexibilityNo cancel feeOn-time69%

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