ONT - PHL

$100 Find Cheap Flights from Ontario to Philadelphia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Philadelphia departing on 6/7. 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.
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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Philadelphia, 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 Ontario to Philadelphia, as well as popular online travel agencies
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Cheap Flight Deals from Ontario to Philadelphia (ONT-PHL)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Philadelphia 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.

Recent round-trip flight deals from Ontario to Philadelphia

KAYAK's recommended round-trip deals from the most popular airlines that fly from Ontario to Philadelphia.
Discover the best prices for you by selecting your travel dates on KAYAK.
Frontier Logo
5:15 pm - 5:38 amONT-PHL
9h 23m1 stop
Frontier Logo
7:10 am - 11:43 amPHL-ONT
7h 33m1 stop
$200Frontier
Find Deal
Sat, May 24 - Wed, May 28
Frontier Logo
1:08 pm - 6:52 amONT-PHL
14h 44m1 stop
Frontier Logo
7:10 am - 8:49 pmPHL-ONT
16h 39m1 stop
$207Frontier
Find Deal
Wed, May 21 - Wed, May 28
American Airlines Logo
12:55 pm - 11:32 pmONT-PHL
7h 37m1 stop
American Airlines Logo
7:37 am - 12:00 pmPHL-ONT
7h 23m1 stop
$307American Airlines
Find Deal
Wed, Jul 2 - Tue, Jul 8
Delta Logo
6:00 am - 5:20 pmONT-PHL
8h 20m1 stop
Delta Logo
6:00 am - 12:14 pmPHL-ONT
9h 14m2 stops
$312Delta
Find Deal
Wed, Jul 2 - Tue, Jul 8
Delta Logo
10:59 pm - 9:29 amONT-PHL
7h 30m1 stop
Delta Logo
6:40 pm - 11:43 pmPHL-ONT
8h 03m1 stop
$325Delta
Find Deal
Tue, Aug 19 - Thu, Aug 21
United Airlines Logo
6:41 pm - 5:57 amONT-PHL
8h 16m1 stop
United Airlines Logo
2:50 pm - 10:26 pmPHL-ONT
10h 36m2 stops
$326United Airlines
Find Deal
Wed, May 28 - Sat, May 31
American Airlines Logo
12:59 am - 11:52 amONT-PHL
7h 53m1 stop
American Airlines Logo
5:21 pm - 9:38 pmPHL-ONT
7h 17m1 stop
$345American Airlines
Find Deal
Fri, Jun 6 - Sat, Jun 21
United Airlines Logo
6:00 am - 6:45 pmONT-PHL
9h 45m2 stops
United Airlines Logo
3:45 pm - 9:04 pmPHL-ONT
8h 19m1 stop
$387United Airlines
Find Deal
Tue, Jun 17 - Fri, Jun 20
Southwest Logo
6:25 am - 7:30 pmONT-PHL
10h 05m1 stop
Southwest Logo
5:10 pm - 11:10 pmPHL-ONT
9h 00m2 stops
$403Southwest
Find Deal
Mon, Jun 30 - Thu, Jul 3
Southwest Logo
12:55 pm - 12:15 amONT-PHL
8h 20m2 stops
Southwest Logo
5:10 pm - 11:10 pmPHL-ONT
9h 00m2 stops
$418Southwest
Find Deal
Mon, Jun 30 - Thu, Jul 3
Useful Info

KAYAK's insights & trends for Ontario to Philadelphia flights

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

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

The average price of all round-trip flights from Ontario to Philadelphia clicked on KAYAK for each day over the last 12 months.

For Ontario to Philadelphia, Tuesday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Philadelphia back to Ontario, the best deals are generally found on Monday, with Saturday being the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Philadelphia, 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 Ontario to Philadelphia is August, where tickets cost $322 (return) on average. On the other hand, the most expensive months are January and December, where the average cost of round-trip tickets is $526 and $463 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Philadelphia, 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 Ontario to Philadelphia, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know

Low seasonJanuary
High seasonJune
Cheapest flight$100
Best time to beat the crowds but there is an average 31% increase in price.
Most popular time to fly with an average 4% increase in price.
Flight from Ontario to Philadelphia

When to book flights from Ontario to Philadelphia

Are your dates flexible? Find out the best times to travel from Ontario to Philadelphia 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 Ontario to Philadelphia

  • Which amenities can I enjoy if I upgrade to business class on flights from Ontario to Philadelphia?

    On-board amenities on the Ontario to Philadelphia flight route can vary depending on the airline. Some exclusive amenities when flying business class include additional luggage allowance, in-flight entertainment, complimentary snacks and drinks, a lie-flat seat, a blanket, and additional legroom. So, upgrading to business class is a great decision on this long-haul flight.

  • What are the common layovers on flights from Ontario to Philadelphia?

    After booking cheap flights from Ontario to Philadelphia, expect a stop or more depending on your airline's flight route. The layover city and duration also vary among airlines. The common layovers are major cities, including Phoenix, Chicago, Charlotte, Dallas, Houston, Denver, Las Vegas, Houston, Salt Lake City, Austin, Atlanta, Oakland, Dallas, Austin, San Francisco, Portland, Orlando, and Seattle.

  • What is the carry-on and checked luggage allowance in economy class for flights from Ontario to Philadelphia?

    The carry-on and checked luggage allowances depend on the airline. If you book Frontier Airlines, your carry-on should be 24 x 16 x 10 inches at most. You’re allowed to bring an additional bag weighing at most 50 lb. If you book American Airlines, your carry-on should be a maximum of 22 x 14 x 9 inches, and another bag with a maximum weight of 50 lb is allowed.

  • What’s the most convenient way to travel from Philadelphia International Airport to downtown Philadelphia?

    The airport line train is a reliable way to travel to downtown Philadelphia from PHL airport. These trains depart hourly, and the trip takes about 24 minutes. Another option is the Line 37 bus that gets to the city in approximately 39 minutes. You can also rent a car at the airport terminal and drive to your destination.

  • What is the cheapest flight from Ontario to Philadelphia?

    In the last 3 days, the lowest price for a flight from Ontario to Philadelphia was $100 for a one-way ticket and $200 for a round-trip.

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

    No, a passport isn't needed to fly from Ontario to Philadelphia. However, local authorities might ask for an official ID.

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

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

  • Which airline alliances offer flights from Ontario to Philadelphia?

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

  • What is the most popular layover when flying to Philadelphia from Ontario?

    Phoenix is the most popular layover city among KAYAK users traveling from Ontario to Philadelphia.

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

    The two airlines most popular with KAYAK users for flights from Ontario to Philadelphia are Delta and Southwest. With an average price for the route of $440 and an overall rating of 8.0, Delta is the most popular choice. Southwest is also a great choice for the route, with an average price of $517 and an overall rating of 8.0.

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

    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 Ontario to Philadelphia.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from Ontario 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 Ontario to Philadelphia?

    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 Philadelphia with an airline and back to Ontario with another airline. Booking your flights between Ontario and PHL 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 Ontario to Philadelphia?

    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 Philadelphia from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Ontario to Philadelphia

  • Frontier Airlines offers an eco-friendly journey on cheap flights from Ontario (ONT) to Philadelphia (PHL). This airline ensures environmental sustainability by using fuel-efficient aircraft and reducing carbon emissions during operations.
  • Ontario International Airport (ONT) is a hub for West Coast Air. At the same time, Philadelphia International Airport (PHL) is a hub for American Airlines. This airport is a gateway for transatlantic and European destinations.
  • The Line 61 bus offers a convenient journey from downtown Ontario to ONT airport. These buses arrive at the airport in about 10 minutes and depart every 30 minutes. You can also take a shuttle or a taxi to arrive at the airport in approximately 5 minutes.
  • You can book Aer Lingus from Ontario to Philadelphia if you need a special meal. This airline offers a wide range of special meals, including gluten-free, vegetarian, and diabetic. You need to order up to 24 hours before departure, but for kosher meals, you must request 48 hours prior to your flight.
  • PHL airport serves several nearby cities. After arriving, you can visit Darby to the north, Woodbury to the west, Springfield to the northwest, Chester to the southwest, and Camden to the northeast. You can rent a car at the airport and drive to your destination.

Top 5 airlines serving from Ontario to Philadelphia

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Philadelphia. 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 Ontario to Philadelphia? 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
8.2Boarding
7.1Food
7.6Entertainment
8.6Crew
8.0Comfort
Airline reviews

It was a perfect flight in all aspects! Both legs!

10.0 ExcellentAnonymous, Apr 2025LGB - SMF
Read more Southwest reviews

It was a perfect flight in all aspects! Both legs!

Great flight, 47 passengers on a 180 seat plane. Stewardess was pleasant and cheerful.

I liked the crew member who gave flight instructions on "in case of a problem:. The seats are so small that only a young teenager could sit in middle seat.

Great flight staff. Ease of boarding. Overall, very uneventful and easy trip.

Employees were kind and funny, as always! Flight was late but no announcements were made for people with tight connections to help them transition quickly. No service due to turbulence.

I recently flew Southwest from San Jose to Honolulu. I was very impressed with the flight crew, especially the flight attendant in charge of the front of the plane. She came through the aisle at least five times for drinks and water, and two times for snacks. I have not seen such service since I flew first class. Also, for the first time, they gave us the correct baggage claim number, and the luggage came out quickly. I can't wait for Southwest to have assigned seating! I absolutely hate the Cattle Call boarding procedure and the mad dash to get seats and overhead bins. However, the boarding was efficient.

We had a nice flight. Boarding was easy, our seats were comfortable and the on board service was pleasant.

Service was great, boarding and exiting went smoothly, and the flight was very pleasant.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a not a great airport.

Was as expected. Crowed planes. Too many carryons delaying takeoff. But the ride only took an hour and saved me a lot of time SFO is a hell hole of an airport. It is the new LaGuardia. Everything Cobbled together. Security gates closed. Terri directional signage

Delta flight was on time, seats were comfortable, and crew was nice.

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

This was the second flight this week with flight attendant Marcus I’m not sure if his last name is Lane or Lang but this guy is awesome. He funny, attentive and his service is 5 stars. Marcus makes business travel more enjoyable !

It was terrible, if they ran flights on time it would make a big difference.

Delta seems to be improving in many areas, except they are super bad with the food available. Bring back normal food service on long flights.

I actually received a notification from kayak on email but not one by text from Delta when my departure gait changed and I almost missed my flight

New boarding doesn't make sense. Filling front first is slow.

Delta flight was great from the check in all the way to arrival. However, I had a very bad experience. I requested a wheelchair and the wheelchair employee that went to pick me up from the plane in Boston to bring me to the baggage claims told me I have to pay him. I was under the impression that it was a free service and I usually give tips but the person forced me to pay and since I said no because I was upset with his demand when my daughter walked in to pick me up he demanded payment from my daughter who paid him thinking maybe now it is a charged service.

Horrible. Grateful to be alive but spent 13 hours at airport only to return back to my familys house and flight changed to next day. They tried to fix a part on plane, had no back up plane and after 10 hours , reattempted the flight and it STILL wasn't fixed. We got a meal voucher and rescheduled flight but there should be some other compensation for the 15 hours spent in airport

The gate was too far away for the connecting flight

Compared with other carriers business class for an overnight was not worth the extra expense.

Easy to board. Flight was super crowded though so I didn't sleep well on that cross country red-eye flight. The aisles seem ot have gotten narrower and the seat smaller whn luggage and people are getting bigger so it would be AWESOME to have more space and breathing room in general ;)

Pilot Erika DeLong made us feel safe and at ease in a frankly scary time to be flying. Her warm smile and greeting and excellent command of the aircraft in foggy bumpy weather helped us all to calm our nerves and get us home safely.

Plenty of room for me and the cat in Premium Economy. Seat was comfortable. Boarding was a breeze. The lady at the special check-in desk was great, super helpful and professional.

Wish movie and music choices changed more often. Mostly same from a month or two ago when I last flew.

It was good. Just that the seats could not be reclined. The people behind were not ready to let the chairs be reclined

Plane left & arrived early- 5 Crew great. Wi fi - paid for 2, only 1 worked - so so. Waste of $. Coolie was good

There was no USB plug in my section of the plane. So I could not charge my phone. Also, there was no screen to watch movie or anything like that. Wish I had known that in advance, I would’ve brought my iPad.

Made all groups except 2 check despite ample bin space. Inflight WiFi and entertainment didn’t work most of the time.

Wonderful as usual except for other guests that were unruly and not kept in check by the Crew.

This was an overnight flight. There was no meal service in first class, just a simple snack basket was offered along with beverages. There should have been some type of continental breakfast prior to arrival in PHL. As an Executive Platinum American Airlines Advantage member, I received no name recognition from the first class flight attendant. When disembarking at PHL, the flight attendants were more interested in their cell phones than saying "thank you" to the passengers as they disembarked.

the pilot that landed this flight in Philadelphia did an amazing job, the weather was absolutely terrible and we landed safely.

The flight was just perfect! We left a few minutes early, had a smooth flight and fortunately had landed before the terrible accident that took off from North Philadelphia airport shortly thereafter.

Timely boarding process, made up for lost time even after a lengthy wait for de-icing

My seat was wonky...hard and not much padding. I sat next to the Jumpseat for the flight attendant. Thoroughly enjoyed not have a third seat in that row! Flight attendants were amazing. I couldn't answer the "food quality" question as there is no food served on my short flight. I commend the pilot as I know it was super gusty when we landed. Thanks

I think I paid for an extra legroom seat and to be honest, there was not a lot of space available for my not very long legs. The flight was totally full and the staff did everything possible to meet the needs of all passengers. My only concern was for the size and spacing of my seat.

I chatted with the captain before the flight, and similarly during the welcome announcement, he warned of a turbulent flight that may impact the in-flight service. However, once at altitude, he announced that the weather changed and he immediately turned off the seatbelt sign. But it appeared the cabin crew had already decided to take off this flight. They remained seated and then just chatted in the galley. The flight was fully catered, but only first class received service.

My flight attendant was attentive! The elderly person next to me was flatulent and the flight attendant could see that I was in distress and brought me some face masks

Overall flight was as expected. It would have been better with a couple options for snack instead of only one item and if there was a TV or music as option. But overall satisfied.

The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.

It was a short flight so no food or entertainment….

Frontier had yet another flight cancellation. Have never made a complete round trip with this airline without at least one leg getting cancelled. Miserable flights - dirty, uncomfortable planes that apparently always have issues since I've had multiple delays and cancellations with them.

Flight was delayed 3 times, would have been nice to have received text message instead of email notifications. Frontier app wasn’t even updated accordingly, no gate number disclosed. No agent at front desk of gate to inform of delay. Very confused and left if the dark

They changed the timing , first delayed by 4 hours then went back to 40 mins late, we had to run back to airport to not miss our flight. This is ridiculous

No frills for sure. No gate announcements about flight delay, not even water to drink on the flight.

I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.

It was a redeye flight, so every passenger just wanted to sleep, but through the entire flight, the flight crew made announcements over the loudspeaker at maximum volume every few minutes making sleep impossible. For example: it’s 2am, and the crew decides to give an extremely detailed announcement about snacks and beverages for sale. And 3am is the perfect time to wake up everyone with a lengthy announcement about how to get a coffee refill and how to take advantage of new offer from frontier for a credit card.

The takeoff was the smoothest I've ever experienced on any airline and this is the first time I've flown on frontier so this was an extremely pleasant surprise!

A lady asked to stop the flight after the tunnel pulled away and we began to depart a flight that was already hours late. The attendance respectfully stopped the the plane and had the tunnel return. After the tunnel returned the passenger claimed to have changed her mind . The tunnel was then put in reverse and the passenger remained on the plane .. They should have sent the sick passenger off the plane like initially replaced. They existed a couple off the plane prior to that situation.. So.. all and all.. it was a long and flight.. .

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