Cheap Flights from Missoula to Ontario International

Compare Missoula to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

Book the best Ontario International fare with no extra fees

Flight deals from Missoula Airport to Ontario International Airport

Looking for a cheap last-minute deal or the best return flight from Missoula Airport to Ontario International Airport? If you want to travel next month, return fares start from R 5,156. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Missoula to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Missoula to Ontario International flights are currently cheapest in June.

Missoula to Ontario: Flight information

The things to know before you go.
Cheapest flight foundR 2,727
Cheapest month to flyJune

Finding cheap flights from Missoula to Ontario International: Frequently asked questions

The best price we found for a return flight from Missoula to Ontario International is R 5,156. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Missoula to Ontario International. But we found flights with one or more stops from R 5,156.
As of March 2026, there are no flights flying from Missoula to Ontario International.
The cheapest month to fly from Missoula to Ontario International is usually April.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Missoula Airport to Ontario International Airport on Friday, 10 April 2026.
No airlines currently offer direct flights between Missoula Airport and Ontario International Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Ontario is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Allegiant Air offers the cheapest flight tickets to Ontario International.

Travelling from Missoula International Airport (MSO) to Ontario International Airport (ONT): what you need to know

  • The timezone in Ontario is UTC-7, which is one hour behind Missoula.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are golden rules for stress-free travel. Show up at the airport on time to board your MSO to ONT flight.

  • You'll likely experience longer lines during popular months like July. Arriving up to four hours in advance for an international flight and two hours for a domestic departure will give you ample time for security and boarding.

  • Think about adding a stopover when booking your ticket from Missoula International Airport to Ontario International Airport. Just deselect 'Direct flights only' to break up your trip, or perhaps explore a new destination along the way. Here's where you can stop between MSO and ONT:

    • Salt Lake City International Airport

    • Denver International Airport

    • Metropolitan Oakland International Airport

How to find the cheapest flights from Missoula International Airport (MSO) to Ontario International Airport (ONT)

  • The cheapest price we've found for a one-way Missoula International Airport to Ontario International Airport flight is R 2,727. A round-trip ticket right now is R 5,156. Depending on the availability and when you book, these fares may change.

  • To pick up cheap tickets from MSO to ONT, book ahead. Airlines typically offer their best fares when flights are first made available.

  • Getting cheap flights from Missoula International Airport to Ontario International Airport is easier if you're flexible with your travel dates. Use the 'Whole month' search tool to see the lowest prices across each month and snap up a great deal.

  • Picking up cheap flights from MSO to ONT couldn't be easier with Price Alerts. All you need to do is create one of these automatic alerts and we'll notify you as soon as a new deal comes up.

  • Choose your ideal arrival and departure times, airlines and number of stops with the filters. Or sort your results by 'Cheapest' to get the best deals on flights from Missoula International Airport to Ontario International Airport.

Handy information about Missoula International Airport (MSO)

  • You'll find MSO at 5225 Highway 10 West.

  • Missoula International Airport has an excellent on-time performance, reducing your chances of a delayed flight. Departures from MSO arrive at their destination as scheduled 82.29% of the time.

  • Central Missoula to Missoula International Airport is approximately 11 kilometres. Depending on traffic, it'll take about 10 minutes to get there if you're driving, ride-sharing or catching a cab.

  • The journey on public transport will take about 35 minutes.

  • Get your journey off to a hassle-free start by staying near MSO. Whether you're boarding an early flight from Missoula International Airport to Ontario International Airport or just don't want to be rushed, these hotels are perfect:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • You'll find ONT at 2900 E. Airport Drive.

  • Ontario International Airport is roughly 6 kilometres from the centre of Ontario. Driving there takes about 10 minutes.

  • Travelling to the centre on public transport takes about 1 hour 30 minutes.

When to fly to Ontario International Airport (ONT)

  • The quietest month for a flight from Missoula International Airport to Ontario International Airport is May, while August is the most popular. Choose the ideal time to visit Ontario based on whether you prefer a more fast-paced or easygoing experience.

  • Lock in your flight from Missoula International Airport to Ontario International Airport for August if you want to visit Ontario during its warmest month. Expect temperatures of between 15ºC (59ºF) and 35ºC (95ºF).

  • January has average temperatures of between 4ºC (39ºF) and 23ºC (73ºF). Look for cheap tickets from MSO to ONT sometime around then if you'd rather travel in cooler conditions.

Explore more of United States

  • Ontario has plenty to offer, but there are so many other corners of United States just waiting to be discovered. About 56 kilometres west of Ontario, a trip to Los Angeles will keep you on the move. Start with leading attractions like Griffith Observatory, The Broad and La Brea Tar Pits & Museum.

  • If you're eager to discover another great destination in United States, head for San Diego, about 153 kilometres south of Ontario. San Diego Zoo, USS Midway Museum and SeaWorld San Diego are key reasons to visit.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.