STL - BOI

$119 Find Cheap Flights from St. Louis to Boise

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Boise departing on 2/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Boise

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Boise, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Boise, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$196
Overall average: $425
Frontier
Wed 3/4Sun 3/8
STL - BOI • 2 stops
Cheapest one-way
$106
Typical prices: $228-$247
Frontier
Sun 2/1
STL - BOI • 1 stop
Top airlines
Frontier
Cheapest • from $196 (round-trip)
Southwest
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
4 weeks
in advance
Our data shows that travelers who book at least 4 weeks in advance save around 45% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
November
Cheapest • 16% price drop
August
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Boise!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Boise (STL-BOI)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Boise that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Boise

Wed, Mar 4 - Sun, Mar 8
Frontier Logo
8:17 pm - 11:51 am
STL
-
BOI
16h 34m
2 stops
Frontier Logo
12:15 pm - 9:49 am
BOI
-
STL
20h 34m
1 stop
$196Frontier
Thu, Feb 26 - Thu, Mar 5
Frontier Logo
10:11 pm - 11:11 am
STL
-
BOI
14h 00m
2 stops
Frontier Logo
12:38 pm - 9:49 am
BOI
-
STL
20h 11m
1 stop
$197Frontier
Wed, Mar 4 - Sun, Mar 8
Frontier Logo
5:18 pm - 11:51 am
STL
-
BOI
19h 33m
1 stop
Frontier Logo
12:15 pm - 9:49 am
BOI
-
STL
20h 34m
1 stop
$208Frontier
Wed, Mar 18 - Sun, Mar 22
Frontier Logo
8:12 pm - 11:20 am
STL
-
BOI
16h 08m
1 stop
Frontier Logo
12:15 pm - 9:49 am
BOI
-
STL
20h 34m
1 stop
$220Frontier
Tue, Mar 31 - Sat, Apr 4
United Airlines Logo
8:30 am - 4:48 pm
STL
-
BOI
9h 18m
1 stop
United Airlines Logo
2:37 pm - 8:54 pm
BOI
-
STL
5h 17m
1 stop
$237United Airlines
Tue, Mar 31 - Sat, Apr 4
United Airlines Logo
11:15 am - 9:22 pm
STL
-
BOI
11h 07m
2 stops
United Airlines Logo
2:37 pm - 8:54 pm
BOI
-
STL
5h 17m
1 stop
$242United Airlines
Wed, Mar 4 - Sat, Mar 7
Delta Logo
7:00 am - 9:56 pm
STL
-
BOI
15h 56m
2 stops
Delta Logo
12:59 pm - 9:38 pm
BOI
-
STL
7h 39m
1 stop
$265Delta
Mon, Mar 2 - Wed, Mar 4
American Airlines Logo
4:13 pm - 10:22 pm
STL
-
BOI
7h 09m
1 stop
American Airlines Logo
1:30 pm - 9:12 pm
BOI
-
STL
6h 42m
1 stop
$282American Airlines
Sat, Mar 7 - Tue, Mar 10
Delta Logo
7:00 am - 12:09 pm
STL
-
BOI
6h 09m
1 stop
Delta Logo
1:45 pm - 12:21 am
BOI
-
STL
9h 36m
2 stops
$285Delta
Tue, Mar 31 - Mon, Apr 6
Delta Logo
6:12 pm - 11:59 pm
STL
-
BOI
6h 47m
1 stop
Delta Logo
11:30 pm - 9:05 am
BOI
-
STL
8h 35m
1 stop
$290Delta
Booking Insights

KAYAK's insights & trends for St. Louis to Boise flights

Get data-powered insights and trends into flights from St. Louis to Boise to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from St. Louis to Boise?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Boise, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Boise is November, where tickets cost $358 (return) on average. On the other hand, the most expensive months are February and December, where the average cost of round-trip tickets is $553 and $502 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from St. Louis to Boise, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from St. Louis to Boise, you should book around 4 weeks before departure, which saves you about 45% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$106
Best time to beat the crowds but there is an average 29% increase in price.
Most popular time to fly and prices are also 10% lower on average.
Flight from St. Louis to Boise

When to book flights from St. Louis to Boise

Are your dates flexible? Find out the best times to travel from St. Louis to Boise based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Boise

  • What is the cheapest flight from St. Louis to Boise?

    In the last 3 days, the lowest price for a flight from St. Louis to Boise was $106 for a one-way ticket and $196 for a round-trip.

  • Do I need a passport to fly between St. Louis and Boise?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from St. Louis to Boise?

    When flying out of St. Louis you will be using Lambert-St Louis. You will be landing at Boise, also known as Boise Air Term. Gowen Fld.

  • Which aircraft models fly most regularly from St. Louis to Boise?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Boise?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between St. Louis and Boise, with oneworld being the most commonly used for this route.

  • Which is the best airline for flights from St. Louis to Boise, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from St. Louis to Boise are Southwest and Delta. With an average price for the route of $426 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $389 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from St. Louis to Boise?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Boise.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Boise?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Boise from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Boise?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Boise with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and BOI can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Boise?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Boise from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from St. Louis to Boise

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Boise. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Boise? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4268 reviews
8.0Comfort
8.1Boarding
7.5Entertainment
8.6Crew
7.0Food
Airline reviews

All good except once again bags took an hour at Midway Airport Happens all the time. Ridiculous

10.0 ExcellentAnonymous, Jan 2026
PHX - MDW
Read more Southwest reviews

All good except once again bags took an hour at Midway Airport Happens all the time. Ridiculous

Everything went smoothly and we even arrived a little bit early.

Great vacation. Can't wait till next year for another one.

Great flight but super high price. Glad it was a business trip and not personal

On time. Friendly staff. Took to long to pre bord all the specialty groups. Cramped small plane

The seats were comfortable, and the boarding process was pretty smooth.

3 hour delay. Had to change plans and was still delayed.

The staff was very friendly, professional, and courteous. The overall flight was a great experience.

The crew canceled the complementary snack and drink in anticipation of turbulence that never materialized. I was counting on the drink (water) to take the the doses of medication - prescribed for my heart condition - that were due during the flight. Since no snack or meal was served on this flight, I cannot rate the food quality. Otherwise, this flight was excellent.

Departure was delayed more than 1/2 hour while we waited for luggage (only) transfer from another flight/plane. Once approved for takeoff, the flight was excellent.

delta last minute gave me a boarding pass for a different flight with no confirmation that they were changing it

The service from the flight attendants were of supreme quality. They greeted and treated everyone with a wide smile. This is totally absent nowadays. Kudos to them!!!!

Excellent flight and got us around tough weather. Only issue was seat TV did not work and crew tried to reboot.

Very large passenger too space from my own seat. Arm board couldn’t be lowered because of his size. It wads very uncomfortable trip, as the flight was full couldn’t move anywhere having back pain because of the position in which I was the entire flight.

was sitting in the jet bridge for 10 minutes in -20 degree weather waiting for my bag

Outdated equipment in disrepair, wifi inoperable. Broken seats, taped air vents, generally poor condition, the 717 showed its age and lack of upkeep.

My flight out of Baton Rouge to Atlanta was delayed by a half hour. This got us into Atlanta airport 30 minutes late. I ran through the airport to get to my connecting flight. As I approached the boarding gate, I saw the boarding door was still open and a passenger was being checked in. But when I got to the gate, the boarding agent told me they had already given away my seat and there were no empty seats on that flight. So I had to take a later flight. That has never happened to me before. Very frustrating.

Connection through Atlanta was difficult. Mechanical issue on plane caused a two hour delay. New gate was a mile away.

No WiFi. Comfort plus should have alcohol provided, crew only offered water or tea. Who the heck wants tea?

The flight was delayed and oversold. I volunteered to give up my seat for compensation. Thinking I could get a good night's sleep instead of arriving home at 2 am. It took over an hour to get the new reservation confirmed, three different gate attendants, and two red coats. It took even longer to confirm the overnight hotel, and when I arrived, the line was 45 minutes long, with two people checking in, and at least 15 people slowly, very slowly—no food except frozen convenience food, no coupon for food from airlines. Slept, headed back to the airport, and that flight had an equipment change and a gate change just as they were about to board. It took an additional hour to board as they cleaned the plane from storage.

HORRIBLE, my initial flight was cancelled, they made me pay $200 extra dollars and that got cancelled as well! After 6 cancellations I decided to get a refund because I needed to get home to my babies. Out of $1000+ dollars they offered me only $40 in refund! Totally unacceptable! The flight that they cancelled I was able to fly it on another airline. I had to spend $400 on one way tickets just to get home! I’m still getting the runaround.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Seated dude next to me even though lots of empty rows. But main thing was we sat on the tarmac after landing for 30 minutes because of, in the words of the dude who sat next to me, “operational incompetence”. We got changing directions about where to pick up gate checked bags. Pilot and flight attendant were awesome though.

It was a pretty standard flight... until the almost hour and a half spent on the taxi way. I get that the weather has been poor but the delay had nothing to do with the weather and more to do with a plane with several issues tying up the gate. I get that that happens from time to time but this has been EVERY flight I've been on for the past 5 years and I fly 3 to 5 times a year. This isn't just United... it's American, it's Delta. It's an issue with the entire industry. I work for UPS and packages on a cargo plane get better service than people do these days. Anymore I HATE flying.

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Unfortunately weather delayed our flight waiting for our plane to arrive and due to a little snow time was needed to deice the plane so departure was very delayed and I missed the connecting flight

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

I wish there were outlets to charge my iPhone. The crew was great; we had a female pilot who was great with explaining what was happening and delays,

The flight crew where really good. Better then the crew from BNE to SFO

Delayed, toilets did not flush, pilot parked to far away from Gate

Don't change gate multiple times make people run across the airport. Announce delays in a timely manner. Have maintenance crew ready. Don't delay and keep passengers on the plane for 3 hrs. on tarmac.

The plane was experiencing problems with the HVAC system, it was very cold in the front of the plane and very hot in the back.

The attendants were kind and helpful. A sugar-free drink would have been very welcome.

Pilot navigated severe weather/snow storm with skill. Described his intentions clearly

one crew said "he" didn't serve double alcohol drinks for travelers in exit rows. crew on prior flight did. Is this a AA rule, and the prior crew was being nice? Also, I think we deserve more than a 25% refund for losing first class seats when rescheduling a flight due to weather

It was a little concerning to hear the ground crew arguing with the flight crew over baggage space. Instead of taking them and checking them, they started checking for space in the first class cabin moving items around like the flight crew didn't know what they were doing. I was embarrassed for them.

2 hour delay due to equipment failure. No updates via the app and airport screens (which continued to show a departure time in the past). AA eventually switched planes and the new plane was not catered or cleaned correctly.

I booked an aisle seat and was given a middle. At 6'4" 230lbs, it is not ideal to fly in the middle row for myself and passengers.

Trip delayed for 2 hours because of rain. We boarded and have to get down the flight and reboard again.

The aircraft had several problems - from excess fuel to non operational ac. Two hours of delay in Chicago could have been avoided with proper planning and aircraft maintenance.

Everything you need to know for your flight from St. Louis to Boise

Information on your arrival and departure airports