ONT - MSO

$101 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 7/4. 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
$263
Typical prices: $405-$490
Multiple Airlines
Wed 7/22Sun 7/26
ONT - MSO • 1 stop
Cheapest one-way
$101
Typical prices: $179-$235
Multiple Airlines
Sat 7/4
ONT - MSO • 1 stop
Top airlines
Cheapest • from $311 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and Missoula. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $350 (round-trip)
Shortest trip • 5h 10m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 37% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
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

Wed, Jul 22 - Sun, Jul 26
Multiple Airlines Logo
3:40 pm - 9:34 am
ONT
-
MSO
16h 54m
1 stop
Multiple Airlines Logo
10:24 am - 8:03 am
MSO
-
ONT
22h 39m
1 stop
$263Multiple Airlines
Mon, Aug 10 - Wed, Aug 12
Delta Logo
5:05 pm - 12:18 am
ONT
-
MSO
6h 13m
1 stop
Delta Logo
5:30 am - 8:52 am
MSO
-
ONT
4h 22m
1 stop
$311Delta
Wed, Jul 22 - Sun, Jul 26
Multiple Airlines Logo
3:40 pm - 9:34 am
ONT
-
MSO
16h 54m
1 stop
Multiple Airlines Logo
10:24 am - 8:03 am
MSO
-
ONT
22h 39m
1 stop
$320Multiple Airlines
Wed, Jul 22 - Sun, Jul 26
Multiple Airlines Logo
8:58 am - 9:34 am
ONT
-
MSO
23h 36m
2 stops
Multiple Airlines Logo
10:24 am - 8:03 am
MSO
-
ONT
22h 39m
1 stop
$351Multiple Airlines
Tue, Sep 15 - Sun, Sep 20
Alaska Airlines Logo
7:12 am - 1:25 pm
ONT
-
MSO
5h 13m
1 stop
Alaska Airlines Logo
7:00 am - 11:16 am
MSO
-
ONT
5h 16m
1 stop
$361Alaska Airlines
Wed, Jul 22 - Sun, Jul 26
Multiple Airlines Logo
8:58 am - 9:34 am
ONT
-
MSO
23h 36m
2 stops
Multiple Airlines Logo
10:24 am - 8:03 am
MSO
-
ONT
22h 39m
1 stop
$375Multiple Airlines
Sun, Aug 9 - Wed, Aug 12
Alaska Airlines Logo
9:20 pm - 10:42 am
ONT
-
MSO
12h 22m
1 stop
Alaska Airlines Logo
5:00 pm - 11:11 pm
MSO
-
ONT
7h 11m
1 stop
$386Alaska Airlines
Wed, Sep 23 - Tue, Sep 29
Alaska Airlines Logo
3:14 pm - 11:01 pm
ONT
-
MSO
6h 47m
1 stop
Alaska Airlines Logo
7:00 am - 3:47 pm
MSO
-
ONT
9h 47m
2 stops
$392Alaska Airlines
Fri, Sep 25 - Mon, Oct 5
Alaska Airlines Logo
6:14 pm - 3:17 pm
ONT
-
MSO
20h 03m
2 stops
Alaska Airlines Logo
3:46 pm - 11:45 pm
MSO
-
ONT
8h 59m
1 stop
$402Alaska Airlines
Sat, Jul 4 - Mon, Jul 13
Delta Logo
5:21 pm - 11:12 pm
ONT
-
MSO
4h 51m
1 stop
Delta Logo
5:35 am - 8:47 am
MSO
-
ONT
4h 12m
1 stop
$411Delta
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.

How much is a round-trip flight from Ontario to Missoula?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to Missoula departing in July.

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 October, where tickets cost $260 (return) on average. On the other hand, the most expensive months are December and August, where the average cost of round-trip tickets is $572 and $540 respectively.

Good to know

Low seasonJanuary
Cheapest flight$101
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly and prices are also 13% 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 5 days, the lowest price for a flight from Ontario to Missoula was $101 for a one-way ticket and $263 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?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Ontario and Missoula, with Star Alliance 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 $408 and an overall rating of 7.9, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $364 and an overall rating of 7.8.

  • 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 3 airlines serving 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.
7.9
Alaska AirlinesOverall score based on 12560 reviews
7.8Comfort
8.1Boarding
8.5Crew
7.0Entertainment
7.0Food
Airline reviews

Subject: Formal Complaint – Incompetent Service and Denied Boarding on Flight 1409 (CLSVJM – Dear Alaska Airlines Customer Relations, I am writing to file a formal complaint regarding my experience on Flight 1409 departing from Seattle on 6/13/26. As a physician and business owner who frequently coordinates group travel, this was one of the worst airline experiences I have encountered. Upon arrival, I was informed that my check-in boarding pass was not official, despite successfully obtaining it electronically through your website/app with no warnings or indications of issues. My electronic boarding pass was rejected, leading to cancellation/denial of boarding. The gate agent (an older woman) was unhelpful, claimed my name had been announced multiple times (which it had not—she did not even know my name correctly), and mistakenly boarded my traveling companion under my name. Additionally, an older blonde staff member nearly failed to return my passport, highlighting a clear lack of training on your check-in and boarding systems. This chaos forced me onto a later flight while my group waited in Canada, unable to check into our Airbnb or pick up rental cars (as I was the primary booker). The entire incident caused significant business disruption, stress, and additional expenses. I have flown Alaska Airlines previously but will not consider it again without resolution. I request: • Full reimbursement of any additional costs incurred. • Appropriate compensation (vouchers/miles) for the inconvenience and poor service. • Confirmation of corrective actions for Please respond within 7-10 business days. Sincerely, Dr. Chunwen Teng

2.0 MediocreJane, Jun 2026
SMF - SEA
Read more Alaska Airlines reviews

Subject: Formal Complaint – Incompetent Service and Denied Boarding on Flight 1409 (CLSVJM – Dear Alaska Airlines Customer Relations, I am writing to file a formal complaint regarding my experience on Flight 1409 departing from Seattle on 6/13/26. As a physician and business owner who frequently coordinates group travel, this was one of the worst airline experiences I have encountered. Upon arrival, I was informed that my check-in boarding pass was not official, despite successfully obtaining it electronically through your website/app with no warnings or indications of issues. My electronic boarding pass was rejected, leading to cancellation/denial of boarding. The gate agent (an older woman) was unhelpful, claimed my name had been announced multiple times (which it had not—she did not even know my name correctly), and mistakenly boarded my traveling companion under my name. Additionally, an older blonde staff member nearly failed to return my passport, highlighting a clear lack of training on your check-in and boarding systems. This chaos forced me onto a later flight while my group waited in Canada, unable to check into our Airbnb or pick up rental cars (as I was the primary booker). The entire incident caused significant business disruption, stress, and additional expenses. I have flown Alaska Airlines previously but will not consider it again without resolution. I request: • Full reimbursement of any additional costs incurred. • Appropriate compensation (vouchers/miles) for the inconvenience and poor service. • Confirmation of corrective actions for Please respond within 7-10 business days. Sincerely, Dr. Chunwen Teng

Never had so many staff members be rude and disrespectful. I had a staff member sarcastically call me “girly” after making me wait 20 minutes to be seen by her. I was able to print my luggage tag and she told me I was too late to check luggage I said the system obviously disagrees. And you had me wait way too long while you asked every single passenger ahead of me about their Disney vacations. She wasted so much time to then say “girly your bag won’t make it on the plane” I’m not her girly I’m a full grown adult. She needs to learn a hell of a lot of respect

My flight was several times rescheduled and then finally canceled.

The flight itself was great. But we had to wait over an hour to deplane so I missed my train. Not the crews fault. They were wonderful!

Flying into PAE was so easy because it’s baggage claim is quick and accesible. I had a car rental and the counter is inside the baggage claim area, very convenient.

It was a very short flight so there really wasn’t any entertainment my. The little pretzels were good though and the cabin crew was awesome.

Didn’t even get on, check my flight to Seattle for details. Do better Alaska.

The first flight was fine, great crew, but the plane was delayed 45 minutes to go to Seattle because of they were missing a ramp. That would make sense if the plane was actually at the gate. Not if we’re still waiting for a plane. After we landed we waited 30-45 minutes on the tarmac just to get off the plane. Alaska made me miss my connecting flight, wasting my time, and my money. I should honestly be reimbursed, but hey, when does the airline ever actually take accountability? Never.

Over all it was great. My original flight was canceled but they quickly rebooked me. I was frustrated because I had to cancel my entire plans for the day but all considered, not bad. The crew tried to keep us calm while we sat in the plane for was felt was an hour or so but they could use a bit of a script. The seats were comfortable and I would give it another try.

Flight delayed Didn’t send second leg of trip itemerary First class was fair, but not great.

Very good flight. Crew was great. No issues and we even arrived early.

Be on time? When not on time a circling for over an hour offer more than 1 bag of chips to the passengers? It was a 7 hour flight by the time we got done.

Flight delayed four separate times. I’m now one hour hours late to landing.

Checkin was good, fllight ws good. Onlly complaint is lack of foot on 6 hour flight from Seattle to Boston. Snacks were flimsy - chips and cookies. could have offered something more substantial for such a long flight. I know you can buy food in airport but for the price you pay for a ticket, they should step up for the passengers.

Long story short, it was one of the better flight experiences I've had in some time when compared with other airlines.

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

N Everything was perfect from boarding to assistance to baggage in Tampa

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

Fast, lovely scenery, great info on the Delta flight screen about landmarks we were flying over. Great landing!

Lost one piece of luggage even though I checked in 2.5 hours before the flight

The boarding process on the departure from LA was rather slow even though I was in Group 1. For first class, I was not expecting to have to pay for Wi-fi but I did and then the wi-fi was spotty. The entree was surprisingly good and so that was a pleasant surprise. However, once I got to Houston, it was terrible. Unfortunately there was bad weather but the constant gate changes for my connecting flight was difficult to manage due to having to navigate back and forth between different terminals.

Service was professional and quick. Premium economy seat was comfortable given the class

The staff was extremely helpful and friendly at all times! They went above and beyond to get us into an earlier flight in San Diego to make our connection in SFO possible, because our original flight did actually not make it! I did so much appreciate the UA team and how they made this possible. We also didn’t have seats together on the long flight to Singapore, but they found us seats together last moment with no additional cost! Nobody sat next to us, so that we were able to sleep! Thanks to UA for improving their service and Underpricer for booking this trip! Please be careful: 1,5 hrs for transfer in San Francisco might not be enough time in the future

Over 2.5 hour maintenance delay on first morning flight with no acknowledgement, compensation or even gesture of good will. Aircraft had overnighted at airport so issue should have been addressed prior to boarding. Over 3.5 hours before first slow and deliberate beverage service.

Horrifying Almost 2 million miles. Bring your own food and drink. One coffee or drink every three hours. Have to order meals on app more than 24 hours ahead Tiny and dirty bathrooms

Flight was delayed but more than 90 minutes. This caused me to miss my available windows for pick-up by a friend. I had to pay $125 for an uber back home from the airport which was an added expense that I had not budgeted for my trip. Staff was friendly.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

My service dog and I were asked to deplane just before they closed the door - clearly very last minute they couldn’t find the documentation that I have filled out many many times before that is for flying service animals. I purposely purchase 3seats (a whole row) since he is large and not all passengers want to sit next to a dog on a cross country flight. The plane departed with my husband on it!!! They made me fill out a hard copy of the same form and had to reschedule me on a later flight where they could find 3 seats together!! I’ve done this so many times before - clearly the error was on their part in a technology glitch - but really people - do better!! Very traumatic - and my husband had to wait for us when he landed ….so bad. Poor pup was confused and tired.

Late plane. Only one crew on the ground so we b had to wait for Denver flight to come in, board, and depart. At 78 yrs of age I was not pleased trying to get my connection. What really made me angry was the notification you sent me to hurry up or I would miss my connection. Why tell me to hurry up when you got me in late. It was not a good way of treating customers.

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

Information on your arrival and departure airports