$149 Cheap Delta flights Ontario (ONT) to Boston (BOS)

Use the “Price (lowest to highest)” filter on Expedia to look for cheap Delta Air Lines round-trip flights from $297 from ONT to BOS. Affordable one-way options from $149 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.

January is one of the least expensive months to travel to Boston with Delta Air Lines. You could also find excellent prices on one-way and round-trip tickets in February.

To find cheap Delta Air Lines fares from Los Angeles - Ontario Intl. Airport (ONT) to Logan Intl. Airport (BOS), 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 typically the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your trip 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.

To figure out if there’s a direct trip from ONT to BOS with Delta Air Lines or another carrier, use our “Nonstop” filter when browsing for flights.

Find Delta Air Lines’s earliest flights from ONT to BOS by checking 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.

Logan Intl. Airport (BOS) is the primary Boston gateway for Delta Air Lines flights from Los Angeles - Ontario Intl. Airport (ONT).

Offering an excellent in-flight experience and a rewarding loyalty program, Delta Air Lines is a top choice for many travelers flying from ONT to BOS. Plus, 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 put toward future travel purchases.*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 typically applies if you change or cancel your flight more than 24 hours after it has been confirmed. To find flexible plane tickets, select our “No cancel fee” or “Changes included” filter while searching for flights. For additional information on canceling or changing your reservation, go to “Trips,” select your flight and tick “Manage Booking.”