BOI - STL

$94 Find Cheap Flights from Boise to St. Louis

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boise to St. Louis departing on 4/2. 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 St. Louis

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

Cheapest round-trip
$277
Overall average: $336
Alaska Airlines
Tue 4/14Wed 4/15
BOI - STL • 1 stop
Cheapest one-way
$94
Typical prices: $181-$310
Frontier
Thu 4/2
BOI - STL • 1 stop
Top airlines
Cheapest • from $277 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Boise and St. Louis. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $327 (round-trip)
Shortest trip • 5h 05m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 5 weeks in advance save around 57% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 28% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to St. Louis!
Flight Deals
Booking Insights
Flight Deals

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

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Boise to St. Louis 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 Boise to St. Louis

Tue, Apr 14 - Wed, Apr 15
Alaska Airlines Logo
2:22 pm - 11:59 pm
BOI
-
STL
8h 37m
1 stop
Alaska Airlines Logo
7:00 am - 3:29 pm
STL
-
BOI
9h 29m
1 stop
$277Alaska Airlines
Thu, May 7 - Mon, May 11
Frontier Logo
1:22 pm - 7:23 pm
BOI
-
STL
29h 01m
1 stop
Frontier Logo
8:08 pm - 12:27 pm
STL
-
BOI
17h 19m
1 stop
$305Frontier
Tue, Apr 14 - Wed, Apr 15
Alaska Airlines Logo
2:22 pm - 11:59 pm
BOI
-
STL
8h 37m
1 stop
Alaska Airlines Logo
7:00 am - 3:29 pm
STL
-
BOI
9h 29m
1 stop
$317Alaska Airlines
Thu, Apr 16 - Thu, Apr 23
Multiple Airlines Logo
11:53 am - 7:21 pm
BOI
-
STL
6h 28m
1 stop
Multiple Airlines Logo
7:00 am - 1:52 pm
STL
-
BOI
7h 52m
1 stop
$319Multiple Airlines
Thu, May 7 - Mon, May 11
Frontier Logo
1:22 pm - 7:23 pm
BOI
-
STL
29h 01m
1 stop
Frontier Logo
9:18 pm - 12:27 pm
STL
-
BOI
16h 09m
2 stops
$321Frontier
Tue, Apr 21 - Tue, Apr 28
Delta Logo
6:16 pm - 12:25 am
BOI
-
STL
5h 09m
1 stop
Delta Logo
12:23 pm - 9:24 pm
STL
-
BOI
10h 01m
2 stops
$326Delta
Wed, Apr 15 - Wed, Apr 22
Southwest Logo
3:15 pm - 11:10 pm
BOI
-
STL
6h 55m
1 stop
Southwest Logo
5:30 am - 4:40 pm
STL
-
BOI
12h 10m
2 stops
$328Southwest
Tue, Apr 21 - Tue, Apr 28
Delta Logo
7:24 am - 5:26 pm
BOI
-
STL
9h 02m
2 stops
Delta Logo
12:23 pm - 9:24 pm
STL
-
BOI
10h 01m
2 stops
$335Delta
Thu, May 14 - Mon, May 18
Frontier Logo
1:22 pm - 7:23 pm
BOI
-
STL
29h 01m
1 stop
Frontier Logo
8:08 pm - 12:27 pm
STL
-
BOI
17h 19m
1 stop
$338Frontier
Wed, Apr 22 - Thu, Apr 23
Delta Logo
3:23 pm - 11:13 pm
BOI
-
STL
6h 50m
1 stop
Delta Logo
9:26 am - 2:26 pm
STL
-
BOI
6h 00m
1 stop
$342Delta
Booking Insights

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Boise to St. Louis, 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 Boise to St. Louis is September, where tickets cost $294 (return) on average. On the other hand, the most expensive months are November and March, where the average cost of round-trip tickets is $572 and $471 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Boise to St. Louis, 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 Boise to St. Louis, you should book around 5 weeks before departure, which saves you about 57% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$94
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly with an average 2% increase in price.
Flight from Boise to St. Louis

When to book flights from Boise to St. Louis

Are your dates flexible? Find out the best times to travel from Boise to St. Louis 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 Boise to St. Louis

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

    In the last 3 days, the lowest price for a flight from Boise to St. Louis was $94 for a one-way ticket and $277 for a round-trip.

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

    No

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

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

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

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

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

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

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

    The two airlines most popular with KAYAK users for flights from Boise to St. Louis are Southwest and Delta. With an average price for the route of $469 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 $362 and an overall rating of 7.9.

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

    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 Boise to St. Louis.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to St. Louis from Boise 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 Boise to St. Louis?

    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 St. Louis with an airline and back to Boise with another airline. Booking your flights between Boise and STL 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 Boise to St. Louis?

    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 St. Louis from Boise up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Boise to St. Louis

 
See real verified KAYAK customer reviews for airlines flying from Boise to St. Louis. 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 Boise to St. Louis? 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 4324 reviews
8.1Boarding
8.0Comfort
7.0Food
8.6Crew
7.5Entertainment
Airline reviews

I flew twice this week on Southwest, was delayed over 2 hours both ways. From Pittsburgh to Chicago it was due to weather but the gate agents, pilot etc were great at updating everyone. Today from Midway to Pittsburgh the plane had come from an international location, kept getting delayed, no information was given until we were delayed for the third time. It was ridiculous, whoever scheduled that plane to fly to Pittsburgh after didn’t consider a lot of things.

2.0 MediocreBeth, Mar 2026
MDW - PIT
Read more Southwest reviews

I flew twice this week on Southwest, was delayed over 2 hours both ways. From Pittsburgh to Chicago it was due to weather but the gate agents, pilot etc were great at updating everyone. Today from Midway to Pittsburgh the plane had come from an international location, kept getting delayed, no information was given until we were delayed for the third time. It was ridiculous, whoever scheduled that plane to fly to Pittsburgh after didn’t consider a lot of things.

Boarding was easy. The seats are small and fairly uncomfortable

I was supposed to be on a later flight. When I showed up at the gate, the woman working there was extremely helpful getting moved up to this earlier flight.

We had a 5 hour delay on the tarmac in Baltimore

Long layover between flights to Long Island from BWI - need better coordination between flights

I elected to pay for the upgrades and found very little difference

The new seating arrangement is so over priced for what you get.

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Snacks for our toddler could have been better, front the standpoint of variety but that’s not any different from other airlines.

Everything ran like it should. Staff was professional. Looking forward to flying with them again.

I fell asleep and missed my flight and they rescheduled me no problem. Staff was professional and the plane was clean. I was very happy with my experience.

I enjoyed the Starlink access but didn't have much time to use it. It also kept dropping me so I gave up. The food was very good though when I asked for a different "dessert" they didn't have anything. Chocolate Brownie Cookies are not suitable for everyone...maybe children. The flight staff were amazing - at least in First Class! My first time ever! The trip from Boise to San Diego was FAR better than going to Boise.

From Las Vegas to Boise all went well. However, our flight was delayed in Boise and I missed my connecting flight from Seattle to Pasco. Moreover, the last flight to Pasco was full and I was booked on the 11:30 flight Sunday and given a hotel accommodation. However, I was scheduled to deliver the Sunday morning service at my church and needed to arrive no later than 10:00. Therefore, I booked a Delta flight scheduled to arrive in Pasco at 23:09. My piece of luggage checked in Las Vegas arrived in Pasco earlier today. I waited at the airport for over an hour last night to speak with an Alaska agent to no avail. I went back after church this morning in search of my piece of luggage and it could not be located. After waiting for 40 minutes to speak to the agent authorized to take my claim, he announced that he was closing the counter to assist on the flight line but not before providing me with a telephone number that would help me with filing my claim. Before I was able to make the call (due to other factors) I received a call from Alaska agent informing me that my luggage had just arrived and I am now waiting for it to be delivered. I deliberately took the more complicated route home to ensure that I would be home in plenty of time to prepare for myself for the Sunday service and accommodate my relatives’ needs. I believe the airport is undermanned given the number of flights coming in and going out. It was fiasco last night with three flights waiting for luggage and another flight landing within minutes. Today’s problems stemmed from a lack of cross training and a serious amount of cargo/baggage going out and too few people scheduled to cover.

It was ok. First time flying with them to Boise Won’t do again

Our late returning flight was annoying. The plane was small, but it made boarding and disembarking quicker. I do wish they offered a gluten free snack.

I was standing in line to use the restroom. A First Class passenger wanted to use the restroom after me, but Jaques made me wait on Flight 3418 from BOI to SJC on December 12, 2025. I felt this was inappropriate and rude.

Both of my planes were delayed which is less than ideal but it's alright, unsurprising with very small flights.

Process of checking bag, boarding, etc. was all very quick, easy, and streamlined. Only problem I had was the seating: very cramped and uncomfortable, but I suppose that’s the perils of coach. Thankfully it wasn’t a super long flight so it didn’t ruin the experience overall.

Delta needs to step its game up get a more reliable internet service. Internet service was non-existent for this flight.

Mechanical Delay of over an hour with multiple gate changes. Entertainment system down for rejuvenation.

I had a flight cancel and had it rerouted. When the rerouted they put me at a window seat instead of an isle. It was hard sitting by the window because the couple with masks on were making out. I get motion sickness which is why I need to have the isle seat.

NEVER MADE THE FLIGHT BECAUSE DELTA SAID THEY CAN NOT

THEY FAILED ME AND I NEVER GOT ON THE FLIGHT BECAUSE IT WAS SO DELAYED! I ENDED UP HAVING TO PAY OUT OF POCKET FOR A HOTEL AND STAY IN NASHVILLE TO CATCH A FLIGHT FOR THE FOLLOWING DAY. DELTA IS POOR CUSTOMER SERVICE>

8 hours late and the plane smelled like urine, that smell in the morning when your child wet the bed in the night.

My flight was canceled on Sunday. Rebooking took three hours. Had to pay for accommodations another night. New flight was delayed for 5 hours, all that was sent was a 12 dollar food voucher, which doesn’t tell you how to use it. Then when we landed we had to sit on the plane for an hour before we could get off.

Miserable. This entire round trip was miserable. I booked evening flights to and from Detroit on consecutive days that should have had me at my destination by 10:30. Instead I arrived after 3am on my flight to Detroit and after midnight on my return. Multiple unforced errors like awaiting bags to get put on the plane for almost an hour in Detroit and a 20 minute delay to pull up to the gate in Atlanta has me rethinking my assumption that delta is the best and most reliable airline

Perhaps when you’re sitting in 1st class and the crew closes the bathroom for the pilots, there could be a notification other than holding your hands up as a blockade when you get there and you’re told the restrooms are closed please turn around … especially at night when visibility is poor and you’re met by a flight attendants with their arms up

First class is comfortable. Enjoyed a movie and was able to relax compared to coach.

Experience was great - no complaints. Took off on time, landed early. Got to the gate relatively quickly - took a little bit of extra time to deplane but nothing excessive.

Economy plus was so cramped I could not use my laptop. It was beyond bad.

OK, we were delayed and had to de plane and reboard.

United is one airline which regardless of how many separate United tickets in existence, if one flight breaks down, the airline will take care of all the flights.

Both our flights were delayed. Almost didn’t get in the second flight. Staff was rude to the bone.

Both my flight where delayed Had 25min to make it to my transfer flight

Everything was on time and service on the flight was great!

Wifi Bluetooth features for watching in flight movie was horrible. Screen kept blacking out no connection of sound although it said connected. Other than that smooth trip .

The travel company that you have on your site did me so wrong. I don’t know how it happened, but they put my son‘s name on my plane ticket flying to Vietnam. Along with his birthday. They would not have let me fly from Fort Myers to Ho Chi Minh City. I don’t think that I can ever use your service again. I typed my information into the browser along with my passport number and four days before I’m leaving I have to quickly search another ticket to fly out here.

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

Mostly good. The WiFi wasn’t working so that was not great.

I rated the experience "mediocre" because of the 2 hour delay in take off. This is the 4th flight from DFW on AA where there was a delay and in one of the instances (after 13 delays), the flight was cancelled. I understand weather but for the March 18th flight, there was no weather issue in Dallas or Detroit. I called Concierge Key and they were wonderful, booking me on a later flight in case my flight was cancelled. I have flown with American for many years and never has there been this consistent pattern of delays. Very disappointing.

They put me on an earlier and I got home sooner

Not good. One of my luggage is missing. And until now they can’t find it

Horrible experience upon landing. Probably more due to DCA utter incompetence than AA.

Jill was the flight attendant in first class she was fabulous!! Best flight attendant I have had in years.!! And I fly every other week. Other can learn from her!!

Really good. I accidentally left my duffel on the plane and the reps were so friendly in retrieving it.

My 9:50AM flight was delayed to 3:40PM "due to incoming aircraft delay". No aircraft is "delayed" that long. Found out once we did board (after several changes in times) that the aircraft had a maintenance issue and we had to wait for another aircraft. Just tell us that. The aircraft we did get was old and the seats need to be updated. I have been traveling for several weeks with AA and you should refresh your entertainment content as frequent flyers have gone through most of your new content. I have Celiac and a shellfish allergy and continue to have struggles with meals on business and first class flights. Please keep this in mind. Sorry - was a long travel day yesterday and a bit cranky this morning with my experience comments. Still an AA fan.

The business steward was absolutely amazing! Smiles and kindness! Wish all AA flights are like this one!

As a first class customer, there was no power the entire flight which limited my ability to work. I find this unacceptable. The first 11 rows on the left side of the plan were out. I was only offered the option to charge my phone which was not the issue because my laptop was out of power. I asked if there was anything that can be done for me, and the answer was, "no". I was not offered any type of compensation for this AA problem which caused me unnecessary stress due to inability to address business issues on an already challenging travel day. Flight attendants tried to reset the power once but that was the extent of their support. Very disappointing for the lack of expected services on a flight. Please contact me with customer focused response to this complaint.

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

Information on your arrival and departure airports