$161 Cheap United flights from Philadelphia to Ontario (PHL to ONT)

Find The Best Day To Fly from Philadelphia to Ontario

Amazing United PHL to ONT Flight Deals

The cheapest flights to Los Angeles - Ontario Intl. found within the past 7 days were $307 round trip and $161 one way. Prices and availability subject to change. Additional terms may apply.

Sat, Dec 6 - Sat, Dec 13
PHL
Philadelphia
ONT
Ontario
$307 Roundtrip, just found
$307
Roundtrip
just found
Select United flight, departing Sat, Dec 6 from Philadelphia to Ontario, returning Sat, Dec 13, priced at $307 just found
Sat, Dec 6 - Sat, Dec 13
PHL
Philadelphia
ONT
Ontario
$312 Roundtrip, just found
$312
Roundtrip
just found
Select United flight, departing Sat, Dec 6 from Philadelphia to Ontario, returning Sat, Dec 13, priced at $312 just found
Mon, Sep 29 - Mon, Oct 6
PHL
Philadelphia
ONT
Ontario
$325 Roundtrip, found 3 days ago
$325
Roundtrip
found 3 days ago
Select United flight, departing Mon, Sep 29 from Philadelphia to Ontario, returning Mon, Oct 6, priced at $325 found 3 days ago
Wed, Oct 1 - Tue, Oct 7
PHL
Philadelphia
ONT
Ontario
$341 Roundtrip, found 6 hours ago
$341
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Oct 1 from Philadelphia to Ontario, returning Tue, Oct 7, priced at $341 found 6 hours ago
Wed, Oct 1 - Tue, Oct 7
PHL
Philadelphia
ONT
Ontario
$347 Roundtrip, found 6 hours ago
$347
Roundtrip
found 6 hours ago
Select United flight, departing Wed, Oct 1 from Philadelphia to Ontario, returning Tue, Oct 7, priced at $347 found 6 hours ago
Sat, Dec 6 - Sat, Dec 13
PHL
Philadelphia
ONT
Ontario
$353 Roundtrip, just found
$353
Roundtrip
just found
Select United flight, departing Sat, Dec 6 from Philadelphia to Ontario, returning Sat, Dec 13, priced at $353 just found

ONT From PHL Economy Coach Packages on Similar Airlines

Price found within the past 48 hours. Click for updated prices.
Ramada by Wyndham Ontario

Ramada by Wyndham Ontario

2 out of 5
per person
Aug 14 - Aug 18
found 1 day ago
Roundtrip non-stop flight included
Philadelphia (PHL) to Ontario (ONT)
Hotel Seville

Hotel Seville

2 out of 5
per person
Aug 14 - Aug 18
found 1 day ago
Roundtrip non-stop flight included
Philadelphia (PHL) to Ontario (ONT)
Baymont by Wyndham Ontario

Baymont by Wyndham Ontario

2.5 out of 5
per person
Aug 14 - Aug 18
found 1 day ago
Roundtrip non-stop flight included
Philadelphia (PHL) to Ontario (ONT)
Don't see what you're looking for?
See all available trips from Philadelphia Intl. to Los Angeles - Ontario Intl.
View all trips

Frequently asked questions

Can I catch a flight from Philadelphia Airport to Ontario Airport right now?
It's prudent to know about any quarantine requirements and travel advice reports in place in your destination city. Be sure to check out our Covid-19 Travel Advisor for up-to-date information on catching a flight to ONT.
What terminal is United Airlines at Philadelphia Intl. Airport (PHL)?
You should find out which terminal United Airlines operates from at PHL once you've seen your ticket. The same can be said for information about your arrival at Los Angeles - Ontario Intl. Airport (ONT). If those details are missing, ask your airline.
Are there United Airlines non-stop flights from PHL to ONT?
You won't find any direct flights from PHL to Ontario Airport with United Airlines. Be ready to make at least one stopover if you have to stick to this airline and route.
How long is a United Airlines flight from PHL to ONT?
As it will take roughly 6 hours and 43 minutes for your United Airlines flight to jet from PHL to ONT, think about throwing a couple of travel games in your carry-on bag. You never know --- the passenger sitting next to you might welcome the chance to play to break up the journey.
How many direct and indirect flights does United Airlines fly from PHL to ONT?
If you need to lock in a journey from PHL to ONT, you can pick from approximately 2 United Airlines flights each day.
If I am not able to travel due to COVID-19, can I change my booking to a later date?
For more info about changing your flight to ONT, please visit our Customer Service Portal.
What is the best day to buy a plane ticket?
This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that is when prices are generally at their highest.
What are the cheapest days to fly?
Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2021, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.
How far in advance can you book a flight?
Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

Travelers ❤️ these 🏨 after their flight to Ontario

Ontario Airport Hotel & Conference Center

Ontario Airport Hotel & Conference Center

3.5 out of 5
700 N Haven Ave, Ontario, CA
This hotel features an outdoor pool, a 24-hour gym, and a restaurant. Traveling on business? Take advantage of the 24-hour business center and free WiFi in public ...
8.6/10 Excellent! (2,866 reviews)
"Very good"

Reviewed on Jul 16, 2025

Ontario Airport Hotel & Conference Center
La Quinta Inn & Suites by Wyndham Ontario Airport

La Quinta Inn & Suites by Wyndham Ontario Airport

3 out of 5
3555 Inland Empire Blvd, Ontario, CA
This hotel features an outdoor pool and a gym. Traveling on business? Take advantage of the 24-hour business center, free WiFi in public areas, and free airport ...
8.2/10 Very Good! (1,902 reviews)
"The stuff was rude"

Reviewed on Jul 15, 2025

La Quinta Inn & Suites by Wyndham Ontario Airport
Ontario Airport Inn

Ontario Airport Inn

2.5 out of 5
1801 E G St, Ontario, CA
This hotel doesn't skimp on freebies - guests receive free buffet breakfast, free self parking, and a free airport shuttle. Traveling on business? Take advantage ...
8.6/10 Excellent! (1,567 reviews)
"I had a great time at this place. It was peaceful."

Reviewed on Jul 15, 2025

Ontario Airport Inn
Lowest nightly price found within the past 24 hours based on a 1 night stay for 2 adults. Prices and availability subject to change. Additional terms may apply.