ONT - MSO

$260 Find Cheap Flights from Ontario to Missoula

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Missoula departing on 2/26. 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 Missoula

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Missoula, 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 Ontario to Missoula, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Ontario to Missoula (ONT-MSO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Missoula 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 Ontario to Missoula

Thu, Feb 26 - Mon, Mar 2
Alaska Airlines Logo
6:00 am - 1:52 pmONT-MSO
6h 52m1 stop
Alaska Airlines Logo
6:30 pm - 10:37 pmMSO-ONT
5h 07m1 stop
$260Alaska Airlines
Find Deal
Mon, Jan 12 - Fri, Jan 16
Delta Logo
6:00 am - 11:59 amONT-MSO
4h 59m1 stop
Delta Logo
6:05 pm - 10:38 pmMSO-ONT
5h 33m1 stop
$261Delta
Find Deal
Thu, Jan 15 - Tue, Feb 3
Alaska Airlines Logo
7:00 am - 1:23 pmONT-MSO
5h 23m1 stop
Alaska Airlines Logo
6:23 am - 1:06 pmMSO-ONT
7h 43m2 stops
$297Alaska Airlines
Find Deal
Wed, Apr 29 - Sat, May 2
Alaska Airlines Logo
3:33 pm - 11:55 pmONT-MSO
7h 22m1 stop
Alaska Airlines Logo
6:30 pm - 10:38 pmMSO-ONT
5h 08m1 stop
$304Alaska Airlines
Find Deal
Mon, Jan 19 - Fri, Jan 23
Delta Logo
6:00 am - 11:59 amONT-MSO
4h 59m1 stop
Delta Logo
6:05 pm - 11:58 pmMSO-ONT
6h 53m1 stop
$320Delta
Find Deal
Tue, Feb 17 - Wed, Feb 25
United Airlines Logo
1:45 pm - 9:57 pmONT-MSO
7h 12m1 stop
United Airlines Logo
6:15 am - 12:43 pmMSO-ONT
7h 28m1 stop
$331United Airlines
Find Deal
Thu, Nov 20 - Fri, Nov 28
Frontier Logo
12:58 am - 6:06 pmONT-MSO
16h 08m1 stop
Frontier Logo
7:01 pm - 11:57 pmMSO-ONT
5h 56m1 stop
$455Frontier
Find Deal
Sat, Nov 29 - Sat, Dec 6
United Airlines Logo
5:05 am - 1:33 pmONT-MSO
7h 28m1 stop
United Airlines Logo
6:15 am - 12:32 pmMSO-ONT
7h 17m1 stop
$738United Airlines
Find Deal
Tue, Dec 23 - Wed, Dec 31
American Airlines Logo
9:53 am - 9:24 pmONT-MSO
10h 31m2 stops
American Airlines Logo
7:00 am - 4:07 pmMSO-ONT
10h 07m2 stops
$869American Airlines
Find Deal
Thu, Jan 1 - Sat, Jan 3
American Airlines Logo
9:53 am - 9:24 pmONT-MSO
10h 31m2 stops
American Airlines Logo
7:00 am - 4:07 pmMSO-ONT
10h 07m2 stops
$1,167American Airlines
Find Deal

Everything you should know

Top airlines
Alaska Airlines
Cheapest • from $260 (round-trip)
Alaska Airlines
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
January
Cheapest • 39% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$260
Typical prices: $354-$642
Alaska Airlines
Thu 2/26Mon 3/2
ONT - MSO • 1 stop
Cheapest one-way
Multiple Airlines
Mon 11/3
ONT - MSO • multi-stop
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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 Missoula!
Booking Insights

KAYAK's insights & trends for Ontario to Missoula flights

Get data-powered insights and trends into flights from Ontario to Missoula 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 Ontario to Missoula?

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

When flying from Ontario to Missoula, you should consider leaving on a Wednesday and avoid Sundays if you are looking for the best rates. For your return to Ontario, you’ll find the best rates on Thursdays and the most expensive ones on Tuesdays.

What is the cheapest month to fly from Ontario to Missoula?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Missoula, 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 Ontario to Missoula is January, where tickets cost $250 (return) on average. On the other hand, the most expensive months are February and June, where the average cost of round-trip tickets is $574 and $554 respectively.

Good to know

Low seasonJanuary
Cheapest flight$260
Best time to beat the crowds with an average 39% drop in price.
Most popular time to fly and prices are also 10% lower on average.
Flight from Ontario to Missoula

When to book flights from Ontario to Missoula

Are your dates flexible? Find out the best times to travel from Ontario to Missoula 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 Ontario to Missoula

  • What is the cheapest flight from Ontario to Missoula?

    In the last 3 days, the lowest price for a flight from Ontario to Missoula was $260 for a round-trip ticket.

  • Do I need a passport to fly between Ontario and Missoula?

    A passport is not required to fly from Ontario to Missoula.

  • Which aircraft models fly most regularly from Ontario to Missoula?

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

  • Which airline alliances offer flights from Ontario to Missoula?

    SkyTeam, and oneworld are the airline alliances operating flights between Ontario and Missoula, with SkyTeam being the most commonly used for this route.

  • Which is the best airline for flights from Ontario to Missoula, Alaska Airlines or Delta?

    The two airlines most popular with KAYAK users for flights from Ontario to Missoula are Alaska Airlines and Delta. With an average price for the route of $429 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $349 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Ontario to Missoula?

    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 Ontario to Missoula.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Missoula?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Missoula from Ontario 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 Ontario to Missoula?

    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 Missoula with an airline and back to Ontario with another airline. Booking your flights between Ontario and MSO 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 Ontario to Missoula?

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

Reviews of the top airlines flying from Ontario to Missoula

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Missoula. 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 Ontario to Missoula? 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 11235 reviews
8.1Boarding
8.5Crew
7.0Entertainment
7.1Food
7.8Comfort
Airline reviews

I recently traveled with my service animal, and before boarding, a gate agent kindly arranged for me to have an empty seat next to me to give my dog more space. However, once on board, a male crew member spoke to me in a rude and loud tone, insisting my dog stay on the floor or my lap—even after I explained what the gate agent had approved. His tone and behavior were unprofessional and made me feel uncomfortable in front of other passengers. I understand and respect airline policies, but I would appreciate if this could be reviewed to ensure better awareness and sensitivity toward passengers traveling with service animals. Thank you for your understanding.

6.0 GoodSofia, Oct 2025SAN - DCA
Read more Alaska Airlines reviews

I recently traveled with my service animal, and before boarding, a gate agent kindly arranged for me to have an empty seat next to me to give my dog more space. However, once on board, a male crew member spoke to me in a rude and loud tone, insisting my dog stay on the floor or my lap—even after I explained what the gate agent had approved. His tone and behavior were unprofessional and made me feel uncomfortable in front of other passengers. I understand and respect airline policies, but I would appreciate if this could be reviewed to ensure better awareness and sensitivity toward passengers traveling with service animals. Thank you for your understanding.

Check in went pretty well and you didn't lose my bag. After I got a drink from the drink cart they charged me for it, and at the crazy overpriced airport rates. Never had that happen before, is that an american thing? what madness.

Kayak I had marked one carry on, one checked bag. Yet when it completed the purchase marked it as no carry on. Fail on kayaks side! Then extended flight delayed due to computer issues. Crew of the plane did awesome but fail on both kayak and alaskan

In both halves of the trip (going and returning) there were problems. Not exactly Alaska's fault, but still really difficult. Outgoing flight was canceled and rebooked twice due to a total ground stop of all Alaska's flights. This required me to change airports with minimal notice and I almost missed my flight transferring to the other airport (which was roughly an hour and a half away). On the return, the first leg was delayed by an hour, and the second leg was delayed by nearly 3 hours. This was a rough set of flights and the communication about all of these changes was minimal. Crew did their best however, so no fault there. Other thing to remember is there is no food on Alaska flights unless you pre-order. Take that into account when you choose airlines.

Check in online didn't accept my confirmation number so i could only check in with assistance at the airport and ended up with s creepy middle seat.

I was delayed several times. Missed a very important event. The airline only provided a $12 voucher after being delayed 3 times.

It was the most expensive Alaska Airlines ticket I’ve ever purchased. I had a middle seat with no legroom or space compared to any other middle seat I’ve hadThere was a silver box under the seat that took up 70% of my legroom on the most narrow 737 max the crew flat out would not help they would not help with bags they would not help with garbage there was no coffee,It was definitely not one of my better experiences on Alaska.

Sitting on the ground for 2 hours waiting for a gate wasn't fun.

It was a great experience, friendly staff and good snacks

Online check in didn't work. Somehow ended up with 2 Alaska rewards numbers and 1 for Hawaiian. No one at check in could figure out what to do. No one at check in could help me confirm an upcoming flight on Hawaiian Airlines.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

Delayed flight (1hour) plus a long layover after an overnight flight with no backup plane available.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

Crew was excellent. Comfort seats not as nice as other kinds of planes.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

There are 4 flights in consecutive gates with about the same departure time. Two flights were boarding at the same time. One was delayed or boarding would be happening at the same time. I am not sure what Delta and LAX need to do to have a better layout at the end of Terminal 2

There was a security issue at the airport and we were unable to land. We circled endlessly and then landed at another airfield for fuel. We then circled the airport again, almost landed but didn’t fully touch down before circling again. I am thankful to the crew for keeping us safe- the issue was the airline and staff at the airport getting us seats on our connecting flights. That part was hours of searching for someone and getting in double my steps.

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.

Everything you need to know for your flight from Ontario to Missoula

Information on your arrival and departure airports

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