$283 Cheap Delta flights Tri-Cities (TRI) to Ontario (ONT)

View $283 flight on Tue, Nov 18, 2025Opens in a new window

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$283 Cheap Delta flights Tri-Cities (TRI) to Ontario (ONT)

Prices were available within the past 7 days and start at $283 for one-way flights and $409 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Jan 24 - Tue, Feb 10
TRI
Tri-Cities
ONT
Ontario
$409 Roundtrip, found 1 day ago
$409
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Jan 24 from Tri-Cities to Ontario, returning Tue, Feb 10, priced at $409 found 1 day ago
Delta
Sat, Nov 1 - Fri, Nov 21
TRI
Tri-Cities
ONT
Ontario
$414 Roundtrip, found 3 days ago
$414
Roundtrip
found 3 days ago
Select Delta flight, departing Sat, Nov 1 from Tri-Cities to Ontario, returning Fri, Nov 21, priced at $414 found 3 days ago
Delta
Tue, Nov 25 - Tue, Dec 2
TRI
Tri-Cities
ONT
Ontario
$419 Roundtrip, found 1 day ago
$419
Roundtrip
found 1 day ago
Select Delta flight, departing Tue, Nov 25 from Tri-Cities to Ontario, returning Tue, Dec 2, priced at $419 found 1 day ago
Delta
Mon, Nov 10 - Thu, Nov 27
TRI
Tri-Cities
ONT
Ontario
$419 Roundtrip, found 3 days ago
$419
Roundtrip
found 3 days ago
Select Delta flight, departing Mon, Nov 10 from Tri-Cities to Ontario, returning Thu, Nov 27, priced at $419 found 3 days ago
Delta
Wed, Oct 8 - Wed, Oct 29
TRI
Tri-Cities
ONT
Ontario
$428 Roundtrip, found 2 days ago
$428
Roundtrip
found 2 days ago
Select Delta flight, departing Wed, Oct 8 from Tri-Cities to Ontario, returning Wed, Oct 29, priced at $428 found 2 days ago
Delta
Wed, Nov 26 - Mon, Dec 1
TRI
Tri-Cities
ONT
Ontario
$433 Roundtrip, found 3 days ago
$433
Roundtrip
found 3 days ago
Select Delta flight, departing Wed, Nov 26 from Tri-Cities to Ontario, returning Mon, Dec 1, priced at $433 found 3 days ago
Flights from Tri-Cities (TRI) to Ontario (ONT)
Origin airport
Tri-Cities Regional
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
American Airlines, Delta
Popular airline
American Airlines
Distance
1980 mi

Frequently asked questions

How much is a Delta Air Lines flight from Tri-Cities Regional Airport (TRI) to Los Angeles - Ontario Intl. Airport (ONT)?
Grab budget-friendly return Delta Air Lines flights from $409 from TRI to ONT by organizing your results from "Price (lowest to highest)" on Expedia. Or search for bargains from $283 for a one-way trip.**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 TRI to ONT with Delta Air Lines?
Delta Air Lines flights to Ontario are usually cheaper in the low-season months of January and April. Whether you're after a round-trip or one-way ticket, you could score a better deal then.
What is the cheapest time to book flights from Tri-Cities Regional Airport (TRI) to Los Angeles - Ontario Intl. Airport (ONT) with Delta Air Lines?
Search for affordable Delta Air Lines flights from Tri-Cities Regional Airport (TRI) to Los Angeles - Ontario Intl. Airport (ONT) one to three months before your departure day. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. Regardless of fare type and journey, the best day to book a domestic flight is generally Sunday and the most expensive day tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book on a Monday.**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 Tri-Cities Regional Airport (TRI) to Los Angeles - Ontario Intl. Airport (ONT)?
Click on our "Nonstop" filter when searching for direct Delta Air Lines flights from TRI to ONT. You can also compare other airlines offering the same nonstop journey.
What is the earliest Delta Air Lines flight from TRI to ONT?
Search Delta Air Lines's earliest flights from TRI to ONT by checking the "Morning" and "Early Morning" filters. Not only will you get to where you're going sooner, early departures also have a 20% less chance of being 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?
Jump on a Delta Air Lines flight from Tri-Cities Regional Airport (TRI) to Ontario, and you'll likely touch down at Los Angeles - Ontario Intl. Airport (ONT). This is the airline's primary hub here.
Why fly with Delta Air Lines from TRI to ONT?
Delta Air Lines makes traveling from TRI to ONT enjoyable with an excellent in-flight experience and a rewarding loyalty program. You could even start earning points with Delta SkyMiles. Remember to sign up to 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 Tri-Cities Regional Airport (TRI) to Los Angeles - Ontario Intl. Airport (ONT)?
Changes are typically free within 24 hours of making a booking, but your airline may charge you after that time. For more information about altering your reservation, head to your "Trips," select your flight and click on "Manage Booking." If you want the flexibility to update your itinerary without extra charges, check the "Changes included" or "No cancel fee" filter when planning your next escape.

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