$121 Cheap Delta flights Billings (BIL) to Ontario (ONT)

View $121 flight on Thu, Sep 18, 2025Opens in a new window

$121 Cheap Delta flights Billings (BIL) to Ontario (ONT)

Prices were available within the past 7 days and start at $121 for one-way flights and $241 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Sep 18 - Tue, Sep 23
BIL
Billings
ONT
Ontario
$241 Roundtrip, found 1 hour ago
$241
Roundtrip
found 1 hour ago
Select Delta flight, departing Thu, Sep 18 from Billings to Ontario, returning Tue, Sep 23, priced at $241 found 1 hour ago
Delta
Thu, Sep 18 - Tue, Sep 23
BIL
Billings
ONT
Ontario
$244 Roundtrip, found 1 hour ago
$244
Roundtrip
found 1 hour ago
Select Delta flight, departing Thu, Sep 18 from Billings to Ontario, returning Tue, Sep 23, priced at $244 found 1 hour ago
Delta
Tue, Oct 7 - Mon, Oct 13
BIL
Billings
ONT
Ontario
$246 Roundtrip, found 20 hours ago
$246
Roundtrip
found 20 hours ago
Select Delta flight, departing Tue, Oct 7 from Billings to Ontario, returning Mon, Oct 13, priced at $246 found 20 hours ago
Delta
Wed, Dec 10 - Mon, Dec 15
BIL
Billings
ONT
Ontario
$262 Roundtrip, found 6 days ago
$262
Roundtrip
found 6 days ago
Select Delta flight, departing Wed, Dec 10 from Billings to Ontario, returning Mon, Dec 15, priced at $262 found 6 days ago
Delta
Thu, Oct 23 - Mon, Oct 27
BIL
Billings
ONT
Ontario
$268 Roundtrip, found 8 hours ago
$268
Roundtrip
found 8 hours ago
Select Delta flight, departing Thu, Oct 23 from Billings to Ontario, returning Mon, Oct 27, priced at $268 found 8 hours ago
Delta
Fri, Oct 3 - Tue, Oct 7
BIL
Billings
ONT
Ontario
$270 Roundtrip, found 7 hours ago
$270
Roundtrip
found 7 hours ago
Select Delta flight, departing Fri, Oct 3 from Billings to Ontario, returning Tue, Oct 7, priced at $270 found 7 hours ago
Flights from Billings (BIL) to Ontario (ONT)
Origin airport
Logan Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Popular airline
Delta
Distance
940 mi

Frequently asked questions

How much is a Delta Air Lines flight from Logan Intl. Airport (BIL) to Los Angeles - Ontario Intl. Airport (ONT)?
Make use of the "Price (lowest to highest)" filter on Expedia to find cheap Delta Air Lines return flights from $241 from BIL to ONT. Affordable one-way options from $121 are available too.**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 BIL to ONT with Delta Air Lines?
January is one of the cheapest months to jet off to Ontario with Delta Air Lines. You could also find fantastic deals on one-way and round-trip fares in April.
What is the cheapest time to book flights from Logan Intl. Airport (BIL) to Los Angeles - Ontario Intl. Airport (ONT) with Delta Air Lines?
Search for cheap Delta Air Lines flights from Logan Intl. Airport (BIL) to Los Angeles - Ontario Intl. Airport (ONT) one to three months ahead of your day of departure. 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 itinerary, the best day to book a domestic flight is generally Sunday and the most expensive day is typically Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel 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 Logan Intl. Airport (BIL) to Los Angeles - Ontario Intl. Airport (ONT)?
To figure out if there's a direct journey from BIL to ONT with Delta Air Lines or any other carriers, check the "Nonstop" filter when searching for tickets.
What is the earliest Delta Air Lines flight from BIL to ONT?
To find the earliest departures from BIL to ONT with Delta Air Lines, filter your search by "Morning" and "Early Morning." Choosing an early flight generally means you'll experience fewer cancellations.**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 gateway for Delta Air Lines flights from Logan Intl. Airport (BIL).
Why fly with Delta Air Lines from BIL to ONT?
With an excellent in-flight experience and a rewarding loyalty program, Delta Air Lines is a top choice for many passengers heading from BIL to ONT. What's more, if you're a Delta SkyMiles and One Key™ member booking with Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be used on future travel purchases.*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 Logan Intl. Airport (BIL) to Los Angeles - Ontario Intl. Airport (ONT)?
Changes are typically free within 24 hours of making your booking, but your airline may add a charge after that. 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 adjust your plans without additional charges, apply the "Changes included" or "No cancel fee" filter when organizing your next adventure.

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*Available to One Key members.