PHL - ONT

$134 Find Cheap Flights from Philadelphia to Ontario - Compare and Save

1 adult
1 adult, Economy, 0 bags

Save 26% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$265
Typical prices: $341-$493
Frontier
Sat 12/8Mon 12/10
PHL - ONT • 2 stops
Cheapest one-way
$134
Typical prices: $166-$332
Frontier
Thu 1/11
PHL - ONT • 2 stops
Nonstop flights
Not available
There are currently no direct flights between Philadelphia and Ontario. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to book
18 weeks
in advance
Our data shows that travelers who book at least 18 weeks in advance save around 29% compared to booking last minute.
Insights
Insights
When to travel
January
Cheapest • 18% price drop
July
Most popular
Good to know
+1
Good to know
+1
Top layover airports
San Francisco (SFO)
Cheapest • Avg $300 (round-trip)
Phoenix Sky Harbor Intl (PHX)
Shortest trip • 7h 37m (one-way)
Insights
Insights
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Philadelphia to Ontario (PHL-ONT)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Philadelphia to Ontario

Tue, Dec 8 - Thu, Dec 10
Frontier Logo
6:31 pm - 10:45 amPHL  Philadelphia-ONT Ontario
19h 14m2 stops Atlanta Hartsfield-Jackson Denver Intl
Frontier Logo
11:30 am - 9:00 amONT  Ontario-PHL Philadelphia
18h 30m2 stops Denver Intl Orlando
$265Frontier
Sat, Dec 19 - Mon, Jan 4
Frontier Logo
7:52 pm - 9:38 pmPHL  Philadelphia-ONT Ontario
28h 46m1 stop Las Vegas Harry Reid Intl
Frontier Logo
10:23 am - 5:11 amONT  Ontario-PHL Philadelphia
15h 48m1 stop Las Vegas Harry Reid Intl
$268Frontier
Tue, Dec 8 - Thu, Dec 10
Multiple Airlines Logo
6:31 pm - 10:45 amPHL  Philadelphia-ONT Ontario
19h 14m2 stops Atlanta Hartsfield-Jackson Denver Intl
Multiple Airlines Logo
5:01 pm - 5:40 amONT  Ontario-PHL Philadelphia
9h 39m1 stop Seattle/Tacoma Intl
$331Multiple Airlines
Wed, Dec 9 - Sat, Dec 12
Multiple Airlines Logo
11:28 am - 10:17 pmPHL  Philadelphia-ONT Ontario
13h 49m2 stops Raleigh-Durham Denver Intl
Multiple Airlines Logo
6:00 am - 5:40 amONT  Ontario-PHL Philadelphia
20h 40m1 stop Seattle/Tacoma Intl
$357Multiple Airlines
Wed, Dec 9 - Sat, Dec 12
American Airlines Logo
4:06 pm - 11:48 pmPHL  Philadelphia-ONT Ontario
10h 42m1 stop Dallas/Fort Worth
American Airlines Logo
1:02 pm - 12:13 amONT  Ontario-PHL Philadelphia
8h 11m1 stop Dallas/Fort Worth
$369American Airlines
Thu, Jan 28 - Mon, Feb 1
American Airlines Logo
6:55 am - 12:39 pmPHL  Philadelphia-ONT Ontario
8h 44m1 stop Phoenix Sky Harbor Intl
American Airlines Logo
12:45 pm - 10:37 pmONT  Ontario-PHL Philadelphia
6h 52m1 stop Dallas/Fort Worth
$369American Airlines
Thu, Dec 3 - Tue, Jan 19
Delta Logo
6:59 pm - 11:57 pmPHL  Philadelphia-ONT Ontario
7h 58m1 stop Salt Lake City
Delta Logo
1:20 pm - 11:58 pmONT  Ontario-PHL Philadelphia
7h 38m1 stop Salt Lake City
$369Delta
Mon, Jan 18 - Fri, Jan 29
Delta Logo
6:58 pm - 11:57 pmPHL  Philadelphia-ONT Ontario
7h 59m1 stop Salt Lake City
Delta Logo
1:20 pm - 11:58 pmONT  Ontario-PHL Philadelphia
7h 38m1 stop Salt Lake City
$369Delta
Tue, Dec 8 - Thu, Dec 10
United Airlines Logo
3:35 pm - 9:11 pmPHL  Philadelphia-ONT Ontario
8h 36m1 stop Denver Intl
United Airlines Logo
6:00 am - 5:21 pmONT  Ontario-PHL Philadelphia
8h 21m1 stop San Francisco
$369United Airlines
Mon, Dec 14 - Tue, Dec 15
United Airlines Logo
9:20 am - 5:36 pmPHL  Philadelphia-ONT Ontario
11h 16m1 stop San Francisco
United Airlines Logo
5:00 am - 3:51 pmONT  Ontario-PHL Philadelphia
7h 51m1 stop Denver Intl
$394United Airlines
Booking Insights

Price, demand and travel trends for Philadelphia to Ontario flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

How much is a round-trip flight from Philadelphia to Ontario?

Round-trip flights from Philadelphia to Ontario typically range from $341 to $493. The lowest price found in the past 5 days was $265, on Frontier.

What's the cheapest day of the week to fly from Philadelphia to Ontario?

Based on deals KAYAK users found in the last 12 months, Saturday is the cheapest day of the week to fly from Philadelphia to Ontario. It’s 8% cheaper than the average day, while Monday is the most expensive, with prices 21% higher.

What’s the cheapest month to fly from Philadelphia to Ontario?

•January is the cheapest month to fly from Philadelphia to Ontario at $322 round-trip.
•March ($483) and June ($472) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 50% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

When are flights from Philadelphia to Ontario the cheapest?

Flights from Philadelphia to Ontario are cheapest 18 weeks before departure. Booking in this window typically costs about 29% less than the average last-minute fare (within 2 weeks of the flight), based on KAYAK data.

Find deals

Key details for Philadelphia to Ontario flights

Low season

February

Cheapest flight

$134
Beat the crowds with an average 46% drop in travelers.
The most popular month to fly with an average 110% increase in travelers.
One-way flight from Philadelphia to Ontario

When to book flights from Philadelphia to Ontario

Are your dates flexible? Find out the best times to travel from Philadelphia to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Your Philadelphia to Ontario flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Philadelphia to Ontario?

    Two cabin classes are available on flights from Philadelphia to Ontario:

    • Economy Class
    • First Class

  • How long is a flight from Philadelphia to Ontario?

    A nonstop flight from Philadelphia to Ontario takes 00m, covering 2,349 miles.

  • Do I need a passport to fly from Philadelphia to Ontario?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

  • How much should I expect to pay for a Philadelphia to Ontario flight?

    Round-trip flights from Philadelphia to Ontario range from $341 to $493, with an average of $392 over the past 12 months. Anything below $341 counts as a good deal.

  • How expensive are last-minute Philadelphia to Ontario flights?

    Last-minute fares on this route (booked within two weeks of departure) run 15% above the $392 route average. Book 18 weeks before departure for the lowest fares.

  • Have flight prices from Philadelphia to Ontario changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $268 to $2,252. That means the highest observed fare was about 8x higher than the lowest one.

  • How are flight prices from Philadelphia to Ontario looking right now?

    One-way fares from Philadelphia to Ontario are currently lower than usual. Average one-way flight prices are about $186, which is 17% below the typical average for this route.

  • What car rental options are available at Ontario Airport (ONT)?

    Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates averaging $60 for economy cars. Top options include:

    • Fox
    • Europcar
    • Thrifty
    • Alamo
    • Dollar

  • Which airports can I use when flying from Philadelphia to Ontario?

    Flights from Philadelphia to Ontario usually depart from Philadelphia (PHL) and arrive at Ontario (ONT).

  • Which airports do connecting flights from Philadelphia to Ontario pass through?

    One-stop flights from Philadelphia to Ontario most commonly connect through:

    • Phoenix Sky Harbor Intl (PHX) - 34% of one-stop connections
    • Denver Intl (DEN) - 23% of one-stop connections
    • Dallas/Fort Worth (DFW) - 22% of one-stop connections
    • Las Vegas Harry Reid Intl (LAS) - 7% of one-stop connections

  • Can I save money by using flexible dates for flights from Philadelphia to Ontario?

    Yes. Flexible dates can save you up to 24% on flights from Philadelphia to Ontario. Saturday is the cheapest departure day at $364 round-trip on average, while Monday is the most expensive at $478, a difference of $114.

    Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

  • How much time can I save by choosing a different layover airport from Philadelphia to Ontario?

    Flying via Phoenix Sky Harbor Intl (PHX) gives the shortest average 1-stop total travel time at 7h 37m, compared with 7h 42m via Chicago Midway (MDW) and 7h 53m via Atlanta Hartsfield-Jackson (ATL).

  • What is the time difference between Philadelphia and Ontario?

    Ontario is 3 hours behind Philadelphia (Pacific Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in Ontario?

    Some of the most popular sights in Ontario are Ontario Convention Center and Cucamonga-Guasti Regional Park. These are among the most viewed places in Ontario on KAYAK.

Your guide to booking Philadelphia to Ontario flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Saturday departure and avoid flying on Monday. On this route, Saturday flights average $364, about $114 less than Monday fares (24% savings) based on the last 12 months.
  • For the best chance at a low fare, aim to book around 18 weeks before you fly. On this route, that window historically saves about 29% versus last-minute pricing (KAYAK booking data, last 12 months).
  • If you can choose when to travel, plan your Philadelphia to Ontario trip for January. Fares historically average $322 round-trip in that month - typically $161 less than the most expensive month, which is March (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ontario Airport.

    • Ontario Airport Inn
    • Azure Hotel & Suites, Trademark Collection by Wyndham
    • Holiday Inn Ontario Airport By IHG

More options for your flight from Philadelphia to Ontario

Complete your trip to Ontario with a hotel stay or car rental

Car rentals in Ontario
Hotels in Ontario
Vacations in Ontario