$147 Cheap Delta flights Las Vegas (LAS) to Ontario (ONT)

Grab affordable round-trip Delta Air Lines flights from $325 from LAS to ONT by organizing your results from “Price (lowest to highest)” on Expedia. Or look for options from $147 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.

Browse for return or one-way flights to Ontario in January or April. You could find cheaper fares with Delta Air Lines during these quieter months.

Search for cheap Delta Air Lines flights from Harry Reid Intl. Airport (LAS) 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 ideal 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 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.

Select our “Nonstop” filter when searching for direct Delta Air Lines flights from LAS to ONT. It’s also an easy way to compare other carriers servicing the same nonstop journey.

To find the earliest departure from LAS to ONT with Delta Air Lines, filter your results by “Morning” and “Early Morning.” Booking an early flight generally means cancellations are less likely.**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.

Delta Air Lines flights from Harry Reid Intl. Airport (LAS) to Ontario come in to land at Los Angeles - Ontario Intl. Airport (ONT). This is the main entry point to this destination.

Jetting off from LAS to ONT with Delta Air Lines means enjoying a variety of perks, such as a rewarding loyalty program and an excellent in-flight experience. Plus, when you book through Expedia, One Key™ members can earn OneKeyCash™* to spend on select future travel purchases. That’s in addition to the Delta SkyMiles points you can earn with Delta Air Lines.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the ticket type you purchased, a fee is typically charged if you change or cancel your flight more than 24 hours after it’s been confirmed. To find plane tickets with more flexibility, select our “No cancel fee” or “Changes included” filter when searching for flights. For more information on modifying or canceling your reservation, head to “Trips,” select your flight and click on “Manage Booking.”