ONT - MSO

$131 Find Cheap Flights from Ontario to Missoula

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Missoula departing on 6/11. 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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Everything you should know

Cheapest round-trip
$217
Overall average: $489
Delta
Tue 3/3Tue 3/10
ONT - MSO • 1 stop
Cheapest one-way
$131
Typical prices: $163-$200
Alaska Airlines
Thu 6/11
ONT - MSO • 1 stop
Top airlines
Delta
Cheapest • from $217 (round-trip)
Alaska Airlines
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
April
Cheapest • 38% price drop
July
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 Missoula!
Flight Deals
Booking Insights
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

Tue, Mar 3 - Tue, Mar 10
Delta Logo
5:00 pm - 11:30 pm
ONT
-
MSO
5h 30m
1 stop
Delta Logo
6:04 pm - 11:51 pm
MSO
-
ONT
6h 47m
1 stop
$217Delta
Tue, Mar 3 - Tue, Mar 10
Delta Logo
5:00 pm - 11:30 pm
ONT
-
MSO
5h 30m
1 stop
Delta Logo
1:07 pm - 10:33 pm
MSO
-
ONT
10h 26m
2 stops
$222Delta
Thu, Feb 26 - Mon, Mar 2
Delta Logo
6:00 am - 12:26 pm
ONT
-
MSO
5h 26m
1 stop
Delta Logo
6:10 pm - 11:49 pm
MSO
-
ONT
6h 39m
1 stop
$261Delta
Thu, Feb 26 - Mon, Mar 2
Delta Logo
5:00 pm - 11:30 pm
ONT
-
MSO
5h 30m
1 stop
Delta Logo
1:16 pm - 10:37 pm
MSO
-
ONT
10h 21m
2 stops
$266Delta
Mon, Feb 23 - Fri, Feb 27
United Airlines Logo
5:00 am - 1:32 pm
ONT
-
MSO
7h 32m
1 stop
United Airlines Logo
2:34 pm - 8:50 pm
MSO
-
ONT
7h 16m
1 stop
$279United Airlines
Mon, Feb 23 - Mon, Mar 2
Delta Logo
6:00 am - 12:26 pm
ONT
-
MSO
5h 26m
1 stop
Delta Logo
6:10 pm - 11:49 pm
MSO
-
ONT
6h 39m
1 stop
$286Delta
Thu, Feb 26 - Mon, Mar 2
Delta Logo
6:00 am - 12:26 pm
ONT
-
MSO
5h 26m
1 stop
Delta Logo
1:16 pm - 10:37 pm
MSO
-
ONT
10h 21m
2 stops
$291Delta
Wed, Feb 18 - Sat, Feb 21
United Airlines Logo
1:45 pm - 9:57 pm
ONT
-
MSO
7h 12m
1 stop
United Airlines Logo
6:15 am - 12:43 pm
MSO
-
ONT
7h 28m
1 stop
$295United Airlines
Sun, May 24 - Tue, May 26
Alaska Airlines Logo
6:00 am - 12:23 pm
ONT
-
MSO
5h 23m
1 stop
Alaska Airlines Logo
7:55 pm - 11:58 pm
MSO
-
ONT
5h 03m
1 stop
$305Alaska Airlines
Mon, Feb 23 - Fri, Feb 27
United Airlines Logo
1:45 pm - 9:57 pm
ONT
-
MSO
7h 12m
1 stop
United Airlines Logo
2:34 pm - 8:50 pm
MSO
-
ONT
7h 16m
1 stop
$308United Airlines
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 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 April, where tickets cost $258 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $563 and $549 respectively.

Good to know

Low seasonMarch
Cheapest flight$131
Best time to beat the crowds but there is an average 17% increase in price.
Most popular time to fly and prices are also 12% 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 $131 for a one-way ticket and $217 for a round-trip.

  • 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 $405 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 $450 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 11829 reviews
7.1Food
7.0Entertainment
8.5Crew
8.1Boarding
7.8Comfort
Airline reviews

Due to plane delays on both legs of my flight home, I had to be rerouted from Santa Rosa to Las Vegas on Skywest and then to DCA on American. SkyWest airlines sat on runway in Las Vegas for 20 minutes waiting for gate to clear. My boarding pass for American that I was given by Alaska was incomplete and the Las Vegas airport lacked signage and departure boards. I barely made my flight bc it was so confusing. American Airlines has a much better wireless connection. I’ll never fly Alaska again. It clearly has problems.

2.0 MediocreAnonymous, Jan 2026
STS - SAN
Read more Alaska Airlines reviews

Due to plane delays on both legs of my flight home, I had to be rerouted from Santa Rosa to Las Vegas on Skywest and then to DCA on American. SkyWest airlines sat on runway in Las Vegas for 20 minutes waiting for gate to clear. My boarding pass for American that I was given by Alaska was incomplete and the Las Vegas airport lacked signage and departure boards. I barely made my flight bc it was so confusing. American Airlines has a much better wireless connection. I’ll never fly Alaska again. It clearly has problems.

I paid for wifi and it never worked... it was miserable. I couldn't access my shared files to work on the plane, it didn't work on my phone. I paid for nothing but frustration and continual refreshing, hoping it would work

The stewardess are very nice and pleasant, Someone onboard had a medical attention, and they attended that person non-stop all throughout the flight, and yet, did not forget to serve and help other passengers.

Worst first/business class I have ever flown after 75 years on planes. Barely acceptable seats, terrible food, uninterested attendants, unavailable WiFi. I’ll never fly this airline again.

The bathroom trash container under the sink fell out and was like that long before my flight. The plane smelled of canned fish and floor was Deteriorating

My TSA pre check was left Off my boarding pass which was a large inconvenience.

Again, very smooth and all of the Alaska folks were great. They continue to meet all my needs.

Overall it was fine, however one of my two checked bags did not arrive and I was told it was left in Palm Springs. I don't understand how one of the two bags made it through fine but the other got lost .

The Alaska Airlines app made it very difficult to find my boarding pass. It was very frustrating to use! The flight itself was flawless.

It wasn’t great. Your app is not user friendly unless you sign up for those points. It tries to force you and won’t show you flight/trip info until you sign up. You have to somehow get into get your boarding pass because your kiosks don’t offer boarding pass information only bag check. It was not helpful or user friendly. The app is useless unless you sign up for your rewards program. My daughters info was missing even though I checked us in we had to get out of security and go back to a ticket window the woman told us that it sometimes populates incorrectly so it didn’t have her information. It populated incorrect birth date. She said this is common. Luckily we were at Palm Springs and not JFK where leaving the giant security line would have been a much bigger problem. I will avoid your airline in the future if it’s possible. Also no food availability except dry snack boxes.

Delta One is extraordinary. I fly business when somebody hires me. I just wonder why there is such a chasm between business class and the insanely inhumane and nonsensical coach. The seats are not large enough to fit even my tiny wife. We fly 10% of what we did because we don’t want to pay 5-10 k but for $400 it’s unbearable. It seems like the accountants took over and made stupid decisions. Screw in 20 extra seats and make it so unbearable that people fly 90% less. Just put the damn price up and put some proper chairs in. But business, yay.

Delta’s staff is unmatched. From the gate agents, to the pilots, to the flight attendants… all top of the industry.

The flight was delayed for about 2 hrs. Other than it, it was good.

I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again

No lunch on a x-country flight scheduled for 10:50 am departure, arrived 5+ hrs later. That requires a black box label before you pay for the tickets. Worst, when I checked in online, it's specifically said that lunch was served on his flight for economy Plus passengers.

Our flight from SFO to MSP was right on time on 11/15/2025. No delays. As we approached MSP at about 8 pm, we circled in the air until 8:40 pm so I don't call that efficient for MSP. I think the captain should announce the delay and why. (as if we all don't know that we are just circling around the area, slowing down, speeding up, slowing down.) Thank you. Marilyn Fischer

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.

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

Information on your arrival and departure airports