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STL - BOI

Find cheap flights from St. Louis to Boise from $68

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 6/12. 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
0 bags
Sun 5/19
Sun 5/26

Search 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
In the last 7 days travelers have searched 44,212,662 times on KAYAK, and here is why:

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Cheap flight deals 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 and deals for you by selecting your travel dates.
Choose your dates
7:00 am - 2:05 pmSTL-BOI
8h 05m1 stop
3:00 pm - 11:59 pmBOI-STL
7h 59m1 stop
$343Alaska Airlines
Find Deal
Wed, May 8 - Sat, May 11
7:00 am - 2:05 pmSTL-BOI
8h 05m1 stop
3:00 pm - 11:59 pmBOI-STL
7h 59m1 stop
$344Alaska Airlines
Find Deal
Wed, May 8 - Sat, May 11
4:00 pm - 10:14 pmSTL-BOI
7h 14m1 stop
5:55 pm - 12:39 amBOI-STL
5h 44m1 stop
$356Delta
Find Deal
Thu, Jul 4 - Mon, Jul 8
10:20 am - 7:14 pmSTL-BOI
9h 54m2 stops
1:17 pm - 9:24 pmBOI-STL
7h 07m1 stop
$365Delta
Find Deal
Wed, May 8 - Sat, May 11
10:20 am - 7:14 pmSTL-BOI
9h 54m2 stops
1:31 pm - 11:40 pmBOI-STL
9h 09m1 stop
$371Delta
Find Deal
Wed, May 8 - Sat, May 11
7:31 am - 4:34 pmSTL-BOI
10h 03m1 stop
12:59 am - 9:29 amBOI-STL
7h 30m1 stop
$401American Airlines
Find Deal
Thu, Jul 4 - Sun, Jul 7
10:20 am - 7:14 pmSTL-BOI
9h 54m2 stops
5:52 pm - 1:32 pmBOI-STL
18h 40m2 stops
$403Delta
Find Deal
Wed, May 8 - Sat, May 11
6:19 pm - 8:25 pmSTL-BOI
27h 06m3 stops
4:20 pm - 3:14 pmBOI-STL
21h 54m1 stop
$427Spirit Airlines
Find Deal
Sun, May 19 - Sun, May 26
5:27 am - 4:34 pmSTL-BOI
12h 07m2 stops
12:59 am - 9:29 amBOI-STL
7h 30m1 stop
$593American Airlines
Find Deal
Thu, Jul 4 - Sun, Jul 7
1:37 pm - 11:04 pmSTL-BOI
10h 27m1 stop
5:00 am - 7:42 pmBOI-STL
13h 42m2 stops
$647United Airlines
Find Deal
Sun, May 19 - Sun, May 26

Flights from St. Louis to Boise - Travel Insights & Trends

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’s the cheapest day of the week to fly from St. Louis to Boise?

The average price of all flights from St. Louis to Boise clicked on KAYAK for each day over the last 12 months.
If your flying dates are flexible, you should consider flying to Boise on a Wednesday, as we generally find the cheapest rates on that day for this route. On the other hand, Monday is the most expensive day to fly from St. Louis to Boise. For your return ticket, we recommend flying on a Tuesday and avoiding Thursdays for the best deals.

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 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 February, where tickets cost $374 on average. On the other hand, the most expensive months are December and March, where the average cost of tickets is $578 and $557 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for 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 month.
To get a below average price on the flight from St. Louis to Boise, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 15 days before departure.

Which airlines provide the cheapest flights from St. Louis to Boise?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the past 3 days, the cheapest one-way tickets to Boise from St. Louis were found on Spirit Airlines ($68) and Delta ($168), and the lowest round-trip tickets were found on Alaska Airlines ($343) and Delta ($356).

Good to know

Low season

April

High season

June

Cheapest flight

$68
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly with an average 5% increase in price.
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 $68 for a one-way ticket and $343 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?

    SkyTeam, oneworld, and Star Alliance 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, Delta or Alaska Airlines?

    The two airlines most popular with KAYAK users for flights from St. Louis to Boise are Delta and Alaska Airlines. With an average price for the route of $467 and an overall rating of 8.0, Delta is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $396 and an overall rating of 8.0.

  • 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.

See more FAQs

Top 5 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
Alaska AirlinesOverall score based on 9109 reviews
8.2boarding
7.3entertainment
7.9comfort
7.3food
8.6crew
Airline reviews

This leg was better than the previous leg mostly because I upgraded my searing and the crew was nicer

8.0 ExcellentAnonymous, Apr 2024LAX - EWR
Read more about Alaska Airlines reviews

This leg was better than the previous leg mostly because I upgraded my searing and the crew was nicer

The absolute coldest flight I’ve ever been on, even with a sweater and zip up sweatshirt. Was miserable the entire flight.

The staff were great and the layover times were excellent no multiple hours. I just hate the Boxed Water. So you really have to purchase high price water in the airport.

I like that we took off on time and arrived a bit early. I like that I could gate check my bag and board early. I don't like how crowded the flight was. I had ok leg room, but could feel every move of the person next to me. And the aisles are very narrow. The gate and flight crews were terrific.

I appreciated the ability to choose between multiple flights both into and out of Portland from Burbank on the same day, so we were able to attend an event and return without spending the night. I am unable to appreciate what Alaska Air calls "streamlining" the checkin/boarding process at Burbank Airport. If you have a smartphone and the Alaska Air app, it is probably fine, but removing the option of using onsite kiosks to print boarding passes does not meet my definition of "streamlined". I also found it challenging that both Portland and Burbank airports required the plane to sit on the runway for some time due to lack of an open gate at which to disembark. It would not be so bad if we could at least remove our seat belts and move a little bit while we waited, but that is not an option. I honestly don't know whether this is because of how Alaska Air operates, or just the circumstances of the particular day and airports we were using, but I normally do not experience these kinds of delays to reach a gate using Southwest Air.

It was not a great flight. There was a software update delay which had us on the ground for almost 2 hours. I was unable to make my shuttle to my final destination.

Both flights were delayed. We sat on the tarmac on Boise for 3 hours with little updates

This flight was significantly affected by poor wifi connections. I couldn’t get my work done because the wifi kept dropping. Even texts were not going through. There is no seat power in premium class either. I fly a lot. Today was my 10th flight in 4 weeks. This was by far the only flight that was sub par.

4 out of 4 flights cancelled or delayed. 5th trip with similar experience

the departure got delayed due to SJC situation, but it was a quite good waiting thanks to Alaska airline teams.

Seat back monitors and outlets were dead and not working.

Everything was great except for the seat. The backrest would not stay in the upright position.

I usually have a positive experience with Delta. Complimentary upgrades are always nice!

Flight delayed about 2 hrs so it made it a VERY late night

It was a crowded flight. They did the best they could.

Service was good for such a short flight. Small plane but smooth flight.

Worst flight in my life. Only was scheduled for a 45 min flight to get our connection flight. It was late by 40 minutes and we missed our connection. Delta was totally useless trying to help and unable to get my family on the next flight because they overbooked it Thus had to get a hotel at my expense and lost a day at Disney as a result. Cost me about a $1000 if you add 2 hotels meals shuttles etc to get thru the day Awful customer service by Delta in Detroit totally useless people

The experience was good and the flight departed on time and landed early

The flight was delayed but we got to our final destination.

Boarding was great. The flight landed early. It took the crew over an hour and a half to bring out drinks. I paid to upgrade my seat to Comfort+ only to be near a crying/screaming baby who was seldom quiet. Noise-cancelling earbuds didn’t even help. Waste of money to upgrade.

I just wrote a text which was supposed to be for the flight from Denver to spokane not Frankfurt to Denver.

On time every leg of the journey and exceptional staff at counter, gate, and on board. I haven’t travelled in US for a long time and was genuinely surprised how pleasant this was.

The delays (5 hrs) were a comedy of errors, and the multiple safety issues encountered were very concerning.

flight delays, staff only communicating when pushed, food service lasting a grand total of 7 minutes, stuck in seat from 45mins into flight until landing

Crew was great and did their best to make us comfortable and captain came out at the beginning to announce why the flight was delayed, weather situation up ahead, and kept us updated throughout the flight.

they made me check my carryon. There was space in the overhead bins.

Nice flight, nice crew but no cookie or napkin with my seltzer.

Trip was smooth bumpy from the wind but no issues at all the crew attendant was very pleasant and had great customer service

This was a Lufthansa flight. Disappointing main meal. Very rough over Canada and arrival at FRA. IFE was almost unusable.

It got me where I needed it to; not much more. It had no competition so that was why I chose it.

Comfort of seats, ease of boarding. Food selection could be better

i suspect i caught flu on this flight as i could hear someone coughing a few rows back and ended up with flu a few days later. also tiresome to have to watch movies on my device by holding up smartphone screen, would have liked to have in seat display.

Flight was fine. It took an unusually long time to have baggage delivered to the carousel in ORD.

No problems with flight. Even though I had a short layover in DFW, I was still able to easily make my connection.

American Airlines continues to price it can provide the least comfortable passenger experience in the air. This legacy carrier rivals the budgets for both terrible seats and inadequate amenities. I am a 5’7” woman who is not wider than a coach seat (even on these narrow bodied aircraft). My 3.5 hour flight was terribly uncomfortable because the leg room is inadequate (my knees hit the seat on front of me even when it was not reclined); the seat barely reclines; and the foam padding is worn thin to the extent one can feel the metal supports of the seat. Add to this the fact that the aisle is super narrow, so that the drink cart literally scrapes the arm rest of the aisle seat. It’s basically torture.

Food options were limited which is absolutely embarrassing for a Flight of this size The staff did not come around as much and I am not accustomed to such poor service from American Airlines Drinks I believe were limited to soda and water

Plane took off without me, my stepdad and a dozen other passengers. It went from an hour delay to boarding in 15 montures without notifying anyone. Names were not called overhead. Now I’m missing a day of work and stuck in Charolette overnight paying for a hotel and Ubers out of pocket

I arrived to the airport 2 hours before my American Airlines flight was scheduled to take off. I have TSA pre-check. The airport was crazy packed when I arrived. After momentarily standing in the pre-check line, the TSA agent said that I am not pre-check. Of course I said that I am because I entered my KTN number on all my traveling sites and programs. I had to get out of line and go back to the AA counter to discover that American Airlines did not add my KTN to my boarding pass. I had to call TSA to find out my number, then have AA enter it onto my boarding pass. The emblem would not load onto my boarding pass. By this time, I decided to use my Clear in order to get through TSA but the line was ridiculous long. By the time I made through TSA, I missed my 11:08am flight and was re-booked for the 5:30pm. This is after the AA employee told me I should have gotten to the airport early. AA use to be a dependable airline not I use them only if I have too.

Average - flew with Jet Blue internal and it was far more comfortable and better food and entertainment. Notable difference

Flight from SBP to DFW 1. They rerouted us through PHX 2. Delayed flight out of SBP for 3 hrs so we missed our connection Downgrade on rerouted flight. Back of the plane, center seats, didn't sit together 4. Return flight out of DFW same exact thing. Delayed, missed connection, Downgrade + they lost our luggage! A complete mess.

They charged me 212.00 for a heavy check in bag at the gate. The pricing and process was so confusing - as if it was designed to purposefully gouge customers who need to board plane. That experience combined with the outrageous price charged will prevent me from ever flying Spirit again. And I’ll be sure to tell the story to anyone who cares to hear.

On time and fast. Overall it was a pleasant experience.

The weight limit per bag was really low - 40 lbs - so we had to pay extra. Then, they said their carry on size was 14x18x8, and we measured our bag very carefully. It was within the limit, yet they said it was too big, so we ended up paying an extra $100 for that too!! So it wasn’t the cheap flight we thought it would be. Then, they moved up our initial flight to depart 3 hours earlier which meant we had to be out on the road by 7 am and then have a 6 hour layover and we got home at 2am. It was a grueling day. I won’t be flying with them again.

Overall it was a good experience. Stewards were very kind and professional. The departure and arrival times were as promised. Plane was clean.

The seat are terrible. Don’t even think of sleeping on a Spirit flight. The kids that run the plane aka flight attendants are pretty rude and straight forward. They get the job done but without class.

No frills, limited comfort, no food, no entertainment, but fine

I had a death in my family and booked my flight on Spirit. My flight was cancelled the morning of my flight, no explanation, no help to rebook, nobody to talk to. The next available flight was 2days later !!!! Terrible airline, will NEVER fly with them again!

Flight was canceled. Knew there was weather, and were notified of 20 min delayed, and then suddenly canceled. Next reschedule was for 2 days. No help other than to refund. Thankfully full refund and appreciate that. I appreciate discounted airline but felt they could've done more for customer inconvenience.

The seat was very uncomfortable from Boston to Nashville. Otherwise the flight was excellent.

Terrible as usual!!!! Very unprofessional and rude flight attendants! You get what you pay for! HORRIBLE

Book cheap flights from St. Louis to Boise

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from St. Louis to Boise found on KAYAK in the last 72 hours.
6/12Wed
1 stopSpirit Airlines
9h 34mSTL-BOI
$68
6/10Mon
1 stopSpirit Airlines
26h 58mSTL-BOI
$103
8/1Thu
1 stopDelta
6h 54mSTL-BOI
$168
5/26Sun
1 stopAmerican Airlines
6h 15mSTL-BOI
$178
6/10Mon
2 stopsDelta
10h 20mSTL-BOI
$196
6/12Wed
2 stopsDelta
10h 20mSTL-BOI
$197
6/10Mon
3 stops
31h 54mSTL-BOI
$206
6/25Tue
2 stopsSpirit Airlines
33h 13mSTL-BOI
$210
6/25Tue
3 stopsSpirit Airlines
34h 36mSTL-BOI
$255
5/26Sun
2 stops
27h 05mSTL-BOI
$276

Search by stops

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Last minute flights from St. Louis to Boise

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from St. Louis to Boise that are departing in the next 10 days.
4/22Mon
multi-stopSpirit Airlines
27h 55mSTL-BOI
4/30Tue
multi-stopSpirit Airlines
12h 28mBOI-STL
$291
4/20Sat
multi-stop
24h 20mSTL-BOI
4/30Tue
multi-stop
12h 28mBOI-STL
$409
4/23Tue
multi-stop
35h 56mSTL-BOI
5/7Tue
multi-stop
12h 31mBOI-STL
$449
4/23Tue
multi-stopDelta
11h 07mSTL-BOI
5/7Tue
multi-stopDelta
4h 41mBOI-STL
$533
4/23Tue
multi-stopAmerican Airlines
6h 46mSTL-BOI
5/7Tue
multi-stopAmerican Airlines
5h 41mBOI-STL
$563
4/20Sat
multi-stopDelta
7h 48mSTL-BOI
5/1Wed
multi-stopDelta
7h 45mBOI-STL
$644
4/20Sat
multi-stopAmerican Airlines
8h 47mSTL-BOI
4/30Tue
multi-stopAmerican Airlines
8h 23mBOI-STL
$656
4/20Sat
multi-stopAlaska Airlines
8h 05mSTL-BOI
5/1Wed
multi-stopAlaska Airlines
15h 59mBOI-STL
$671
4/22Mon
multi-stopAlaska Airlines
10h 15mSTL-BOI
4/30Tue
multi-stopAlaska Airlines
7h 59mBOI-STL
$698
4/21Sun
multi-stopUnited Airlines
17h 31mSTL-BOI
5/1Wed
multi-stopUnited Airlines
20h 59mBOI-STL
$904

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St. Louis - Boise Flights

Departure:

St. Louis (STL)United States

Destination:

Boise (BOI)United States

Return flight deals:

Boise - St. Louis

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