BOI - STL

$279 Find Cheap Flights from Boise to St. Louis

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Boise to St. Louis departing on 11/5. 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

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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Flights 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

Wed, Nov 5 - Tue, Nov 11
United Airlines Logo
5:00 am - 12:39 pmBOI-STL
6h 39m1 stop
United Airlines Logo
9:00 am - 1:25 pmSTL-BOI
5h 25m1 stop
$279United Airlines
Find Deal
Wed, Aug 6 - Sun, Aug 10
American Airlines Logo
5:15 pm - 12:16 amBOI-STL
6h 01m1 stop
American Airlines Logo
6:14 pm - 11:31 pmSTL-BOI
6h 17m1 stop
$283American Airlines
Find Deal
Wed, Nov 5 - Tue, Nov 11
United Airlines Logo
6:20 am - 4:28 pmBOI-STL
9h 08m2 stops
United Airlines Logo
4:43 pm - 9:21 pmSTL-BOI
5h 38m1 stop
$284United Airlines
Find Deal
Fri, Sep 19 - Sat, Sep 27
Hawaiian Airlines Logo
6:35 am - 2:39 pmBOI-STL
7h 04m1 stop
Hawaiian Airlines Logo
3:35 pm - 10:40 pmSTL-BOI
8h 05m1 stop
$286Hawaiian Airlines
Find Deal
Wed, Nov 5 - Tue, Nov 11
Southwest Logo
12:05 pm - 9:35 pmBOI-STL
8h 30m2 stops
Southwest Logo
10:25 am - 5:10 pmSTL-BOI
7h 45m2 stops
$289Southwest
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Wed, Nov 5 - Tue, Nov 11
Delta Logo
7:30 am - 5:57 pmBOI-STL
9h 27m2 stops
Delta Logo
7:30 am - 8:16 pmSTL-BOI
13h 46m2 stops
$306Delta
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Fri, Sep 26 - Sun, Sep 28
Delta Logo
5:40 am - 5:57 pmBOI-STL
11h 17m2 stops
Delta Logo
6:59 pm - 12:17 amSTL-BOI
6h 18m1 stop
$326Delta
Find Deal
Sat, Aug 30 - Sun, Aug 31
Alaska Airlines Logo
8:46 pm - 2:39 pmBOI-STL
16h 53m1 stop
Alaska Airlines Logo
6:30 pm - 7:20 amSTL-BOI
13h 50m2 stops
$340Alaska Airlines
Find Deal
Fri, Sep 19 - Sat, Sep 27
Alaska Airlines Logo
6:35 am - 2:39 pmBOI-STL
7h 04m1 stop
Alaska Airlines Logo
6:00 am - 4:50 pmSTL-BOI
11h 50m2 stops
$346Alaska Airlines
Find Deal
Wed, Jul 9 - Fri, Jul 11
Southwest Logo
5:30 pm - 12:20 amBOI-STL
5h 50m1 stop
Southwest Logo
6:35 pm - 1:05 amSTL-BOI
7h 30m1 stop
$363Southwest
Find Deal
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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’s the cheapest day of the week to fly from Boise to St. Louis?

The average price of all round-trip flights from Boise to St. Louis clicked on KAYAK for each day over the last 12 months.

When flying from Boise to St. Louis, you should consider leaving on a Tuesday and avoid Mondays if you are looking for the best rates. For your return to Boise, you’ll find the best rates on Wednesdays and the most expensive ones on Sundays.

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 April, where tickets cost $334 (return) on average. On the other hand, the most expensive months are January and March, where the average cost of round-trip tickets is $831 and $486 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 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 14 weeks before departure.

Good to know

Low seasonJanuary
High seasonJune
Cheapest flight$279
Best time to beat the crowds but there is an average 90% increase in price.
Most popular time to fly and prices are also 11% lower on average.
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 $294 for a one-way ticket and $279 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?

    Star Alliance, oneworld, 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, Delta or Southwest?

    The two airlines most popular with KAYAK users for flights from Boise to St. Louis are Delta and Southwest. With an average price for the route of $364 and an overall rating of 8.0, Delta is the most popular choice. Southwest is also a great choice for the route, with an average price of $458 and an overall rating of 8.0.

  • 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.

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
Alaska AirlinesOverall score based on 10000 reviews
8.1Boarding
7.8Comfort
7.1Entertainment
8.5Crew
7.1Food
Airline reviews

Both flights were delayed going to our destination and leaving, and communication about the delays was not great by the airlines, now the crews were phenomenal and great to be around!!

6.0 GoodAnna, Jun 2025SEA - BUR
Read more Alaska Airlines reviews

Both flights were delayed going to our destination and leaving, and communication about the delays was not great by the airlines, now the crews were phenomenal and great to be around!!

Both flights were delayed due to an incident at SEA. The problem really rests with inadequate customer & plane facilities for Skywest at SEA. You feel like you are in a cattle enclosure. And planes were sitting on taxiways waiting for parking so every plane was late. SEA appears to be over capacity. It is not a fun passenger experience waiting. But crews and flights were all fine. Alaska needs to step up.

Really good except my daughter's tv broke during the flight so she could watch tv

Staff are helpful and patient. I don’t appreciate the almost 5 hours delay and also the delay of our luggage and being switched from one carousel to another to pick them up.

Delayed. It's not our first flight with them either, it's actually our 3rd and all 3 were delayed by hours each time. It was a myriad of delays. On one flight we boarded after being delayed for a little over an hr, only to be told we were going to sit in the plane for another hour before departing. Once landed, we waited another 40ish min to get to our gate. On another flight, flight was delayed just under 3 hrs but atleast we got to wait it out at the airport terminal. Its just a bad experience overall flying with Alaska Airlines.

Flight was delayed for weather, then delayed for mechanical, then just cancelled. Once mechanical problems started I wish you had just started offering rebooking options (at the same airport). I felt my trip was not a priority for you. I called you, I asked for a better option (than changing airports), then I had to literally run around the airport making it happen. Do better.

Staff were great but we were delayed on the tarmac for over an hour.

Great crew, smooth flight and landing. Wish they would offer Dr. Pepper and a choice of flavors of pretzels.

I would've liked to have the seat tablets like before to view movies, with long travels not everyone carries tablets to view movies. And phones are not worth it because screens to small.

It was horrible. Last minute gate change, delays, more delays and then we had to wait for a stweardess to onboard. No explanation for the wait. No apologies. We got to RDM way past schedule @ 1:30 am!!!! Stressful and exhausting. We'd avoid flying Alaska ever again.

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

Southwest is typically delayed, and it gets wearisome. It is no longer a discount airline and you get way less than you pay for when it comes to comfort and Ce.

We sat on the plane on the tarmac for 4 hours.

I'm not a fan of Southwest's model. I don't like the herding style of boarding.

Flight crew and cabin crew were great. I had to rearrange flights because my original flight was 3hrs delayed for weather, the rub is the flight I moved to boarded on time then we sat at the gate for 2 hours because scheduling stole our first officer for another flight, TWICE. Then our actual FO was an hour delayed. To make it worse my original flight went from a 3 hour delay to departing 15min EARLY. Just poor scheduling operations all around.

Bring back peanuts Take our drink orders when were all seated, especially after you switch to assigned seating.

Staff was far less than helpful at all times. Departure and arrival times mean nothing to Southwest. Extremely disappointed, will never fly with them again, and I’ll be sure to share my experience with all.

It is southwest seat was ok. Not the most comfortable seat

I’ve always loved Southwest. No issues at all. I was flying standby and the gate agent was extremely friendly and helpful. Boarding was smooth and I was able to get a window seat in the emergency exit row. Crew was fantastic! They were very professional and accommodating. We had to divert from our destination due to weather but the flight crew kept everyone at ease and informed us of all pertinent information. Excellent flight

The price of the tickets isn't matching the flight experience. No matter how long the flight is, you're only getting pretzels. The flight attendants looked unkept and over it.

The flight was scheduled for 2:30 PM. Early in the morning we got a text message saying the flight was delayed and rescheduled for 3:00 PM. We got to the airport with that in mind. Then we got a message during check-in at the flight was rescheduled again for 2:30 PM. We almost missed our flight. In fact, our bags Were told that they would not make it. At the end, everything worked out. But it is very stressful.

Most aspects were good however if they assign boarding zones they ought to enforce them or why bother? My luggage from SAN-JFK-MAD was lost in NY so I without my main bag for two days upon arrival in Spain. They were helpful in tracking it and eventually delivered it to my hotel. The flub was because of a delay upon arrival in NYC. I had booked 2 1/2 hours between flights but we had to hold on the taxiway for an hour after landing while waiting for a clear gate which likely caused the baggage error.

Excellent check-in. Crew was good. Excellent communication from flight deck.

Great overall. There was a bit of turbulence so they could only serve water because too much turbulence for the carts. Was glad they prioritized safety though

Excellent flight, the planes were newer, they did a nice job with boarding, great service overall.

Great service. Flight was delayed while we sat on the runway for a couple of hours. Weather related. Staff made is very bearable. The steward servicing the first class cabin was exceptional. Thank you! 💗

5 hours of delay that could've been much shorter if Delta had taken the 1 hour delay they imposed on the flight before boarding to run any of the plane checks required for flight to find the hydraulic issue that required nearly 3 hours to fix. $24 of meal credit buys a sandwich and a soft drink. Poor communication within the terminal about what gate we'd be re-boarding from and when we'd be re-boarding.

Amazing flight! I have never noticed the uniforms of the attendants before in twenty years of flying except today when one female had the most amazing dress on. It was beautifully designed and showed she was in charge. I never dreamed I would google who designed Delta uniforms . The ultimate compliment is when another woman admires your outfit. . I hope your designer puts it on the market

It would be nice if was given wires ear buds. Overall was a good experience was able to sleep on the plane

My flight was 6 pm 6/6. Every hour they delayed it again - air condition issues then no pilot then the crew had worked too many hours and cancelled the flight at 11 pm. Sent customers to NJ a 45 minutes uber ride to a hotel. Had to be back by 5 am for a 7 am flight and again no pilot etc with another three hours of delays.

United airlines, mediocre at best. No issues , nothing great . Worked for me

it was so bad. I tried to board my flight from vancouver to saskatoon. And to my surprise they did not board me cause the flight was changed and no email was send to me. and on my boarding pass which i got from seattle says different flight. I did not knew anyone from Vancouver, air canada crew was rude, i asked for today flight but they were rude and i had early morning dental appointment in saskatoon. I was so much in pain and my whole day is wasted today. and i suffered alot. They did provide me hotel but they did not provide me any food. I am really really disappointed first time had so bad experience with air canada. I may think twice to book it again. If i can get any reply or any composition that would be great. Thanks

It was fine, definitely older planes with no charging or anything. There’s no entertainment set up on board, but it is nice that they allow you to access the in flight entertainment from your phone without having to pay for the Wi-Fi and they do offer free texting.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Impressed with the service despite turbulence because of the weather. Both flights arrived before their scheduled times.

Very comfortable (upgraded to business class). The audio on my screen didn’t work, but I managed to play the audio through my phone while watching the screen.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

I was supposed to be on business class at first class from Denver back to Miami due to weather changes. I missed my connection and it’s put on a flight to Fort Lauderdale. Instead of honoring my business class/1st class ticket, they put me in coach, but there were two first class seats open. I think it’s absolutely disgusting that I paid for first class $1300 ticket and they put me in economy and they had to open seats available and I have still not been refunded the difference. I ended up having to eat a snack box instead of the meal I was supposed to get and did not get home till 2 AM so I think that’s a little pathetic that I had to live off crackers for dinner And my poor dog ate some cheese and salami. Oh yes, apparently when they switched me to the new flight they forgot to mention I had a service dog

Excellent service despite turbulence during the flight. Flight attendants were remarkable!

I liked that the flight was nonstop from ORD to CIU for $200 round trip.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

I’m impressed that we were on time in Sacramento after having a late departure in Newark and our made it. The staff was friendly and warm.

Cramped seats. FAA should make airlines have more legroom, for even short people complain

5.5 hour delay with no explanation on why, along with no proactive effort to reaccomodate me.

It was one of my worst flight ever. First they were changing the gate for at least 4 times, changing from gate D7 to D12 to D44. Considering the size of the Miami Airport, we are talking about long distance and the train at the airport was not working. Then the flight was delayed around one hour. Then finally we boarded into the plane and when everybody was seated, there was an announcement that there is an issue with one of the tire of the plane, so we all had to get out of the plane with our belongings, to replace the tire. So we had around 2.5-hour delay

Most miserable flight ever. We waited almost 2 hours on the runway because the flight was oversold. American offered $1200 credit. Then there was some nonsense about weight distribution. Ridiculous. No food for 8 plus hours on the flight. I will be writing a letter.

Honestly, I haven’t flown American in years, probably due to the pandemic and my being unable to travel for certain periods in the last two years, but it was a good experience to dig out or obtain a new American Airlines account after many years of traveling for business with American in the past.

The plane was probably full boarding was easy. We were able to check our carry-on luggage for free. It was a return flight through Philly to LA. Never saw a stewardess do a demonstration of emergency Procedures. I think my flight was pretty full

Plane, flight, crew, captain were all great. The first flight had a Chipotle box lunch...delicious.

Plane, flight, crew, captain were all great. The first flight had a Chipotle box lunch...delicious. this return flight not as tasty, but filling.

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

Information on your arrival and departure airports

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