PHL - ONT

$127 Find Cheap Flights from Philadelphia to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Philadelphia to Ontario departing on 5/28. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Philadelphia to Ontario, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$268
Typical prices: $421-$290
United Airlines
Mon 8/31Mon 8/31
PHL - ONT • 1 stop
Cheapest one-way
$127
Typical prices: $137-$244
United Airlines
Thu 5/28
PHL - ONT • 1 stop
Top airlines
Cheapest • from $268 (round-trip)
Best reviews • 8.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Philadelphia and Ontario. You'll need at least 1 connection.
Insights
Insights
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Insights
Top layover airports
Cheapest • Avg $308 (round-trip)
Shortest trip • 7h 38m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 33% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 17% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Philadelphia to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Philadelphia to Ontario

Mon, Aug 31 - Mon, Aug 31
United Airlines Logo
6:00 am - 12:12 pm
PHL
-
ONT
9h 12m
1 stop
United Airlines Logo
7:13 pm - 9:58 am
ONT
-
PHL
11h 45m
2 stops
$268United Airlines
Tue, Jul 28 - Sat, Aug 8
American Airlines Logo
11:05 am - 6:19 pm
PHL
-
ONT
10h 14m
1 stop
American Airlines Logo
10:10 pm - 11:17 am
ONT
-
PHL
10h 07m
1 stop
$277American Airlines
Thu, Jun 11 - Thu, Jun 18
American Airlines Logo
3:52 pm - 10:36 pm
PHL
-
ONT
9h 44m
1 stop
American Airlines Logo
1:11 pm - 11:57 pm
ONT
-
PHL
7h 46m
1 stop
$295American Airlines
Tue, Aug 4 - Tue, Aug 25
American Airlines Logo
7:05 am - 12:03 pm
PHL
-
ONT
7h 58m
1 stop
American Airlines Logo
11:59 pm - 1:03 pm
ONT
-
PHL
10h 04m
1 stop
$299American Airlines
Tue, Jun 9 - Sat, Jun 13
American Airlines Logo
5:00 am - 9:31 am
PHL
-
ONT
7h 31m
1 stop
American Airlines Logo
1:11 pm - 11:57 pm
ONT
-
PHL
7h 46m
1 stop
$305American Airlines
Fri, Jul 10 - Tue, Jul 28
Delta Logo
7:30 am - 12:10 pm
PHL
-
ONT
7h 40m
1 stop
Delta Logo
10:00 pm - 9:31 am
ONT
-
PHL
8h 31m
1 stop
$306Delta
Wed, Jul 1 - Tue, Jul 7
Delta Logo
5:15 am - 10:40 am
PHL
-
ONT
8h 25m
1 stop
Delta Logo
6:01 pm - 5:29 am
ONT
-
PHL
8h 28m
1 stop
$307Delta
Wed, Jul 1 - Tue, Jul 28
Frontier Logo
11:06 am - 7:51 pm
PHL
-
ONT
11h 45m
1 stop
Frontier Logo
3:40 pm - 6:22 am
ONT
-
PHL
11h 42m
1 stop
$310Frontier
Thu, Jul 9 - Mon, Jul 27
Delta Logo
5:15 am - 10:38 am
PHL
-
ONT
8h 23m
1 stop
Delta Logo
10:00 pm - 10:57 am
ONT
-
PHL
9h 57m
1 stop
$311Delta
Sat, Jun 13 - Sat, Jun 20
American Airlines Logo
5:09 pm - 10:36 pm
PHL
-
ONT
8h 27m
1 stop
American Airlines Logo
2:18 pm - 12:36 am
ONT
-
PHL
7h 18m
1 stop
$317American Airlines
Booking Insights

KAYAK's insights & trends for Philadelphia to Ontario flights

Get data-powered insights and trends into flights from Philadelphia to Ontario to help you find the cheapest flights, the best time to fly and much more.

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

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Philadelphia to Ontario departing in August.

What is the cheapest month to fly from Philadelphia to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Philadelphia to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Philadelphia to Ontario is September, where tickets cost $346 (return) on average. On the other hand, the most expensive months are March and December, where the average cost of round-trip tickets is $492 and $486 respectively.

How far in advance should I book a flight from Philadelphia to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Philadelphia to Ontario, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Philadelphia to Ontario, you should book around 3 weeks before departure, which saves you about 33% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 24 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$127
Best time to beat the crowds with an average 3% drop in price.
Most popular time to fly with an average 16% increase in price.
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
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Philadelphia to Ontario

  • What is the cheapest flight from Philadelphia to Ontario?

    In the last 3 days, the lowest price for a flight from Philadelphia to Ontario was $127 for a one-way ticket and $268 for a round-trip.

  • Do I need a passport to fly between Philadelphia and Ontario?

    A passport is not required to fly from Philadelphia to Ontario.

  • Which aircraft models fly most regularly from Philadelphia to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Philadelphia to Ontario?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Philadelphia and Ontario, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Philadelphia to Ontario, Southwest or Delta?

    The two airlines most popular with KAYAK users for flights from Philadelphia to Ontario are Southwest and Delta. With an average price for the route of $500 and an overall rating of 8.0, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $372 and an overall rating of 7.9.

  • How does KAYAK find such low prices on flights from Philadelphia to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Philadelphia to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Philadelphia to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Philadelphia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Philadelphia to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Philadelphia with another airline. Booking your flights between Philadelphia and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Philadelphia to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Philadelphia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Philadelphia to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Philadelphia to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Philadelphia to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4292 reviews
8.1Boarding
8.6Crew
7.0Food
7.5Entertainment
8.0Comfort
Airline reviews

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

10.0 ExcellentRobert, May 2026
LAS - SFO
Read more Southwest reviews

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

Not having a five hour delay with little notice! The crew was very kind, though, and just as tired as we passengers were. The flight didn't depart until nearly 1 am...and no reason was ever given.

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Boarding was easy. The seats are small and fairly uncomfortable

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

No food or entertainment, just a quick 40 minute flight. A little bumpy due to Santa Ana winds but pilot has no control over that. Good flight and landing!

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

Mediocre. Boarding is now unpleasant. The employees, once friendly and nice, are now regularly speaking sternly to passengers, badgering them to do things right so they can take off on time and gate check bags because they don't have enough overhead bin space. The pretzel snack was crushed flat and broken into even smaller pieces, which happens frequently lately. Drink service was suspended before they reached my row.

The charges were ridiculous for an hour flight and the turbulence was very scary.

Everything went smoothly, although the usual gripes about airline travel were still present: the boarding process is inefficient, the snack selection is limited, and so on. Since there was extra space on the flight, the gate agent rearranged many people's seats to put people on the aisles and windows, leaving the middle seats empty, as much as possible, which was pretty great.

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

One of the flight attendants was a little cranky. I appreciated the free wifi and plug to charge my laptop

WiFi didn’t work most of the time. The usb chargers would work only occasionally for 5 mins and wouldn’t charge after that. Had to keep trying repeatedly at each of the seats in the row.

The crew bent over backwards to thank us for flying and make us comfortable. The food service was quick and efficient. The Captain communicated and said goodbye and thank you as we departed. They really stood out!

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

my mom urmila patel needed a wheelchair which was not available on the curbside. she needed to walk almost 50 meters inside (at the risk of falling) and then had to wait in line to get a wheelchair (this is not ok). Once obtained she had to seat in it for 30-45 minutes for someone to take her in thru the checkin process (which was fairly smooth and easy). the lady who helped her with her checkin process was very courteous and helpful

Staff at the check-in counter were friendly, happy and helpful. They tagged our bags and sent us to “bag drop off” but were not very clear about where that was. The airport was busy we headed off in what we thought was the right direction until a gentleman waved us down and actually came after us. He was the baggage handler for Delta and recognized our “deer in the headlights “ look-he brought us to the right area (which was marked as the Southwest Airlines Drop Off) and sent us on our way. Wonderful guy, low key and working with a big smile on his face. Loved it. Loved him.

Arlene was a great flight attendant. I also liked how one of the other flight attendants gave us a heads up about snacks and asked everyone to remove their headphones when it was their turn to order. Good idea.

I haven’t flown economy in over 20 years but it was not bad. Room by my feet for my bag and seat was roomy enough. Surprised in a good way.

Late plane. Only one crew on the ground so we b had to wait for Denver flight to come in, board, and depart. At 78 yrs of age I was not pleased trying to get my connection. What really made me angry was the notification you sent me to hurry up or I would miss my connection. Why tell me to hurry up when you got me in late. It was not a good way of treating customers.

No complaints other than luggage carousel was incorrectly guiding passengers to the wrong carousel on the screen.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

The flight was delayed from take off because only one runway was operational in San Francisco.

Several missed and almost missed connections. It felt like everything was being patched together last minute without enough resources and it ended up being an extremely stressful experience that basically ruined our weekend on the west coast. What a waste.

newer aircraft, ability to connect my headset via blue tooth for entertainment.

Packed in plane small uncomfortable seats elbow to elbow nobody wants to be in that situation for the money they paid

Checking in united could not figure out my star alliance gold. Baggage did not get marked priority and didn't receive boarding passes. When got to SFO lounge personal fixed everything Immediately

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

Fine. Nothing to write home about. The plane left on time, and arrived on time.

Flight left early and arrived 30 MINUTES early at the destination. Smooth trip.

Flight was 3 hours delayed. They gave our plan to two other routes. Need to knock that off.

The flight was on time and the landing was very smooth. The crew and flight attendants were all very friendly and professional.

Plane was super cold. No entertainment unless you were with mileage program Getting off the plane was super slow

I appreciate that I finally got the seat I paid extra for this time. Thank you

Half of the TSA checkpoints at PHL are closed. Also, there is no standby for first class passengers. You can only standby for coach. Very dated policy and inconsistent with peers.

It would have been nice if American tried to care.

Delayed initially because they couldn’t print the flight details. Poor instruction on delay. When I got on the plane the flight attendant argued with me about whether my carry on would fit (it did, although she didn’t acknowledge that). No greeting (other than arguing with me) getting on or off the plane.

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

Our flight was canceled. I will never use Kayak nor Frontier for travel again. The entire experience was a headache.

First of all we hade waited 3 hours in the airplane waiting to leave. Second the return schedule was changed and it messed up my entire vaction. I won't buy never again another flight and recommend to nobody traveling with them.

I am writing to express my disappointment with my recent Frontier Airlines flight. I was charged $99 at the gate because my bag was said to be too large, yet once onboard there was no available overhead bin space, and I was required to place the bag under the seat in front of me anyway. This made the charge feel unnecessary and unfair. Additionally, before the flight even took off, I was asked to move from the seat I paid for into a middle seat so another passenger and her cat could have my seat to themselves. I was not offered compensation or an explanation for being moved from a paid seat. Between the unexpected bag fee and being forced to give up my seat, this experience fell well below acceptable customer service standards. I would appreciate a review of this situation and appropriate compensation.

Terrible. Flight cancelled with no reasoning and no flights to rebook. Employees were useless and did nothing to help. Did not even know where to retrieve luggage from the cancelled flight. Flyers beware.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

i was unable to check in the flight. refund requested

I think Frontier was very good at communication. Their app worked very well. Loading was great and the flight was nice and easy.

Great for the price. No wifi or entertainment, but gate agents and crew were fantastic and we boarded quickly and left on time.

sluggish boarding and arrival procedures, fake nice flight attendants, and lots of delays.

Decent clean onboard experience. Okay discount airline experience. Unfortunately, any customer service interactions are difficult and unhelpful. There is no service. Also, a premium seat only gets you premium boarding if you line up first. Once they start general boarding you must go to the back of the line. Not very premium

Everything you need to know for your flight from Philadelphia to Ontario

Information on your arrival and departure airports