$172 Cheap Delta flights Philadelphia (PHL) to Ontario (ONT)

View $172 flight on Wed, Oct 22, 2025Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • one key icon
    Earn twice
    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

$172 Cheap Delta flights Philadelphia (PHL) to Ontario (ONT)

Prices were available within the past 7 days and start at $172 for one-way flights and $308 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Wed, Aug 13 - Tue, Aug 19
PHL
Philadelphia
ONT
Ontario
$308 Roundtrip, found 10 hours ago
$308
Roundtrip
found 10 hours ago
Select Delta flight, departing Wed, Aug 13 from Philadelphia to Ontario, returning Tue, Aug 19, priced at $308 found 10 hours ago
Delta
Wed, Oct 22 - Mon, Oct 27
PHL
Philadelphia
ONT
Ontario
$343 Roundtrip, just found
$343
Roundtrip
just found
Select Delta flight, departing Wed, Oct 22 from Philadelphia to Ontario, returning Mon, Oct 27, priced at $343 just found
Flights from Philadelphia (PHL) to Ontario (ONT)
Origin airport
Philadelphia Intl.
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, JetBlue Airways, Southwest Airlines, United
Popular airline
American Airlines
Distance
2349 mi
Average flight time
7 hours 5 mins

Frequently asked questions

How much is a Delta Air Lines flight from Philadelphia Intl. Airport (PHL) to Los Angeles - Ontario Intl. Airport (ONT)?
Set the "Price (lowest to highest)" filter on Expedia to search for cheap Delta Air Lines round-trip flights from $308 from PHL to ONT. Affordable one-way fares from $172 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 PHL to ONT with Delta Air Lines?
January is one of the least expensive months to travel to Ontario with Delta Air Lines. You could also find fantastic deals on one-way and return fares in April.
What is the cheapest time to book flights from Philadelphia Intl. Airport (PHL) to Los Angeles - Ontario Intl. Airport (ONT) with Delta Air Lines?
To find cheap Delta Air Lines fares from Philadelphia Intl. Airport (PHL) to Los Angeles - Ontario Intl. Airport (ONT), start searching one to three months before your intended departure. Reserving 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 influence the overall cost. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by choosing to book 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 Philadelphia Intl. Airport (PHL) to Los Angeles - Ontario Intl. Airport (ONT)?
Fill in your dates, click search and check the "Nonstop" filter on Expedia to find any direct flights from PHL to ONT with Delta Air Lines or another carrier.
What is the earliest Delta Air Lines flight from PHL to ONT?
Filter your results by "Early Morning" and "Morning" to see the earliest departures from PHL to ONT. Leaving early means flight 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.
What airports does Delta Air Lines fly into in Ontario?
Get on a Delta Air Lines flight from Philadelphia Intl. Airport (PHL) to Ontario, and you'll most likely come in to Los Angeles - Ontario Intl. Airport (ONT). This is the airline's primary hub in this city.
Why fly with Delta Air Lines from PHL to ONT?
Delta Air Lines makes flying from PHL to ONT more enjoyable with a rewarding loyalty program and an excellent in-flight experience. You could even start earning points with Delta SkyMiles. Be sure to join Expedia's 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 Philadelphia Intl. Airport (PHL) to Los Angeles - Ontario Intl. Airport (ONT)?
Depending on the ticket type you purchased, a fee generally applies if you cancel or reschedule your flight more than 24 hours after it's confirmed. To secure plane tickets with more flexibility, select our "Changes included" and "No cancel fee" boxes when you look for flights. For additional information on modifying or canceling your reservation, go to "Trips," select your flight and tick "Manage Booking."

Explore a world of travel with Expedia

*Available to One Key members.