$131 Cheap Delta flights Missoula (MSO) to Ontario (ONT)

View $131 flight on Thu, Nov 20, 2025Opens in a new window
    notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
    deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
    trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

$131 Cheap Delta flights Missoula (MSO) to Ontario (ONT)

Prices were available within the past 7 days and start at $131 for one-way flights and $261 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Apr 7 - Tue, Apr 21
MSO
Missoula
ONT
Ontario
$261 Roundtrip, found 9 hours ago
$261
Roundtrip
found 9 hours ago
Select Delta flight, departing Tue, Apr 7 from Missoula to Ontario, returning Tue, Apr 21, priced at $261 found 9 hours ago
Delta
Thu, Nov 13 - Mon, Nov 17
MSO
Missoula
ONT
Ontario
$265 Roundtrip, found 1 day ago
$265
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Nov 13 from Missoula to Ontario, returning Mon, Nov 17, priced at $265 found 1 day ago
Delta
Thu, Dec 11 - Tue, Jan 6
MSO
Missoula
ONT
Ontario
$273 Roundtrip, found 3 days ago
$273
Roundtrip
found 3 days ago
Select Delta flight, departing Thu, Dec 11 from Missoula to Ontario, returning Tue, Jan 6, priced at $273 found 3 days ago
Delta
Thu, Dec 11 - Tue, Jan 6
MSO
Missoula
ONT
Ontario
$281 Roundtrip, found 3 days ago
$281
Roundtrip
found 3 days ago
Select Delta flight, departing Thu, Dec 11 from Missoula to Ontario, returning Tue, Jan 6, priced at $281 found 3 days ago
Delta
Thu, Dec 4 - Sun, Dec 7
MSO
Missoula
ONT
Ontario
$283 Roundtrip, found 3 days ago
$283
Roundtrip
found 3 days ago
Select Delta flight, departing Thu, Dec 4 from Missoula to Ontario, returning Sun, Dec 7, priced at $283 found 3 days ago
Delta
Tue, Apr 7 - Thu, Apr 23
MSO
Missoula
ONT
Ontario
$286 Roundtrip, found 9 hours ago
$286
Roundtrip
found 9 hours ago
Select Delta flight, departing Tue, Apr 7 from Missoula to Ontario, returning Thu, Apr 23, priced at $286 found 9 hours ago
Flights from Missoula (MSO) to Ontario (ONT)
Origin airport
Missoula Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Hawaiian Airlines, United
Popular airline
Delta
Distance
906 mi

Frequently asked questions

How much is a Delta Air Lines flight from Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT)?
You'll find cheap return Delta Air Lines flights from $261 from MSO to ONT by organizing your results from "Price (lowest to highest)" on Expedia. Or search for deals from $131 for a one-way journey.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from MSO to ONT with Delta Air Lines?
Look for one-way or return flights to Ontario in January or April. You could find lower fares with Delta Air Lines during these quieter months.
What is the cheapest time to book flights from Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT) with Delta Air Lines?
To find cheap Delta Air Lines fares from Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT), start searching one to three months before your planned departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact the overall price. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your flight on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does Delta Air Lines fly nonstop from Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT)?
To see if there's a direct route from MSO to ONT with Delta Air Lines or any other airlines, check the "Nonstop" filter when searching for tickets.
What is the earliest Delta Air Lines flight from MSO to ONT?
Find Delta Air Lines's earliest flights from MSO to ONT by selecting our "Early Morning" and "Morning" filters. Not only will you get to your destination sooner, early departures are also 20% less likely to be canceled.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does Delta Air Lines fly into in Ontario?
Los Angeles - Ontario Intl. Airport (ONT) is the primary Ontario hub for Delta Air Lines flights from Missoula Intl. Airport (MSO).
Why fly with Delta Air Lines from MSO to ONT?
Delta Air Lines makes flying from MSO to ONT more enjoyable with an excellent in-flight experience and a rewarding loyalty program. You even have the chance to collect points with Delta SkyMiles. Remember to join our free One Key™ rewards program to earn OneKeyCash™*, which can be redeemed on future travel.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Delta Air Lines flight from Missoula Intl. Airport (MSO) to Los Angeles - Ontario Intl. Airport (ONT)?
Depending on your fare type, a fee is typically charged if you change or cancel your flight more than 24 hours after it has been confirmed. To find flexible fares, select our "No cancel fee" or "Changes included" filter when you search for flights. To learn more about modifying or canceling your reservation, visit "Trips," select your flight and tick "Manage Booking."

Explore a world of travel with Expedia

*Available to One Key members.