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Cheap Flights from Ontario International to Philadelphia International

Compare Ontario International to Philadelphia International flight deals

Find the cheapest month or even day of the year to fly to Philadelphia International

Book the best Philadelphia International fare with no extra fees

Flight deals from Ontario International to Philadelphia International

Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to Philadelphia International Airport? If you want to travel next month, return fares start from R 3,968. Find the lowest prices on one-way and return tickets right here.
Philadelphia.R 1,636 per passenger.Departing Tue, 6 Oct.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Tue, 6 Oct, arriving in Philadelphia International.Price includes taxes and charges.From R 1,636, select.
Philadelphia.R 2,037 per passenger.Departing Wed, 12 Aug.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Wed, 12 Aug, arriving in Philadelphia International.Price includes taxes and charges.From R 2,037, select.
Philadelphia.R 2,090 per passenger.Departing Fri, 4 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Fri, 4 Sep, arriving in Philadelphia International.Price includes taxes and charges.From R 2,090, select.
Philadelphia.R 2,582 per passenger.Departing Mon, 2 Nov.One-way flight with Delta.Outbound indirect flight with Delta, departs from Ontario International on Mon, 2 Nov, arriving in Philadelphia International.Price includes taxes and charges.From R 2,582, select.
Philadelphia.R 2,590 per passenger.Departing Wed, 9 Dec.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 9 Dec, arriving in Philadelphia International.Price includes taxes and charges.From R 2,590, select.
Philadelphia.R 2,591 per passenger.Departing Tue, 9 Feb.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 9 Feb, arriving in Philadelphia International.Price includes taxes and charges.From R 2,591, select.
Philadelphia.R 2,800 per passenger.Departing Wed, 27 Jan.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 27 Jan, arriving in Philadelphia International.Price includes taxes and charges.From R 2,800, select.
Philadelphia.R 2,984 per passenger.Departing Wed, 24 Mar.One-way flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 24 Mar, arriving in Philadelphia International.Price includes taxes and charges.From R 2,984, select.
Philadelphia.R 3,015 per passenger.Departing Sat, 25 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Ontario International on Sat, 25 Jul, arriving in Philadelphia International.Price includes taxes and charges.From R 3,015, select.

Find the cheapest month to fly from Ontario International to Philadelphia International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Philadelphia International flights are currently cheapest in October.
Jul
from R 3,015
Aug
from R 2,037
Sep
from R 2,090
Oct
from R 1,636
Nov
from R 2,582
Dec
from R 2,590
Jan
from R 2,800
Feb
from R 2,591
Mar
from R 2,984
Apr
Find prices
May
Find prices
Jun
Find prices

Ontario International to Philadelphia International: Alternative routes

Compare routes from Ontario International to Philadelphia below. You may find an airport to fly into that's cheaper, faster, or easier than Philadelphia International.

Philadelphia International

11km from central Philadelphia
ClosestCheapest
from R 1,636
Search flights

Philadelphia Trenton-Mercer

47km from central Philadelphia
from R 3,402
Search flights

Greater Wilmington

49km from central Philadelphia
Search flights

Atlantic City International

75km from central Philadelphia
from R 4,790
Search flights

Allentown

81km from central Philadelphia
from R 2,892
Search flights

Ontario to Philadelphia: Flight information

The things to know before you go.
Cheapest flight foundR 1,636
Cheapest month to flyOctober

Finding cheap flights from Ontario International to Philadelphia International: Frequently asked questions

The best price we found for a return flight from Ontario International to Philadelphia International is R 3,672. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Ontario International to Philadelphia International. But we found flights with one or more stops from R 3,672.
As of July 2026, there are no flights flying from Ontario International to Philadelphia International.
The cheapest month to fly from Ontario International to Philadelphia International is usually September.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Philadelphia International Airport on Tuesday, 8 September 2026.
No airlines currently offer direct flights between Ontario International Airport and Philadelphia International Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Philadelphia International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Philadelphia is around 40 days in advance, so don’t leave your flight to the last minute.

Currently, Frontier Airlines offers the cheapest flight tickets to Philadelphia International.

Flying from Ontario International Airport (ONT) to Philadelphia International Airport (PHL): what you need to know

  • Philadelphia's timezone is UTC-5, which makes Philadelphia three hours ahead of Ontario.

  • Leave plenty of time to make your ONT to PHL flight. As a general rule, turn up at least two hours before international departures and an hour ahead for domestic flights.

  • During popular months like July, you'll want to get to the airport even earlier. Arrive two hours before domestic departures and four hours ahead of international flights whenever you're flying during a high season in general.

  • Think about adding a stopover when booking your ticket from Ontario International Airport to Philadelphia International Airport. Just uncheck 'Direct flights only' to break up your trip, or maybe even explore a new city along the way. Here are some options between ONT and PHL:

    • Denver International Airport

    • Phoenix Sky Harbour Airport

    • Chicago Midway Airport

How to find the cheapest flights from Ontario International Airport (ONT) to Philadelphia International Airport (PHL)

  • Right now, R 1,636 is the lowest price we've found for a one-way Ontario International Airport to Philadelphia International Airport flight. The best price for a return plane ticket is R 3,672. Bear in mind that fares can change due to demand at the time of booking.

  • It's often best to book ahead of time if you want to find cheap tickets from ONT to PHL. That's because flight prices are based on demand, which tends to rise closer to the date of departure.

  • If you can be flexible with your trip dates, use the 'Whole month' search tool. It'll show you the cheapest price across every month when looking for your flight from Ontario International Airport to Philadelphia International Airport.

  • There's no need to check every day to see if fares have dropped when you create a Price Alert. We'll notify you as soon as there's a new deal on cheap flights from ONT to PHL.

  • Tailor your trip with filters. Select your arrival and departure times, total journey duration and airlines. You can also sort results by 'Best,' 'Cheapest' or 'Fastest' flights from Ontario International Airport to Philadelphia International Airport.

Handy information about Ontario International Airport (ONT)

  • ONT is located at 2900 E. Airport Drive.

  • Ontario International Airport has a strong on-time performance, so you're less likely to experience disruptions. Departures from ONT touch down on schedule 83% of the time.

  • To get to Ontario International Airport from central Ontario, it'll take about 15 minutes if you're travelling by car. This depends on traffic though. It's approximately 10 kilometres from the airport to the city centre.

  • The trip when using public transport takes roughly 45 minutes.

  • Looking for a convenient hotel near ONT? If you're boarding an early flight from Ontario International Airport to Philadelphia International Airport, these accommodation options will put you moments from your departure gate:

Arriving at Philadelphia International Airport (PHL)

When to fly to Philadelphia International Airport (PHL)

  • It's time to choose your dates for your flight from Ontario International Airport to Philadelphia International Airport. August is the most popular month to visit Philadelphia. If you prefer a more low-key vibe, go in March.

  • When reserving your flight from Ontario International Airport to Philadelphia International Airport, think about the type of weather you like. July is the warmest month in Philadelphia, with temperatures ranging from 18ºC (64ºF) to 32ºC (90ºF).

  • If you'd rather travel in cooler conditions, look for a cheap ticket from ONT to PHL in January. Average temperatures are between -7ºC (19ºF) and 9ºC (48ºF) then.

Explore more of the United States

  • New York is just one of the many cities in the United States waiting to be discovered once you've taken in the sights of Philadelphia. Around 129 kilometres away to the north-east, its best attractions include Central Park, Statue of Liberty and Metropolitan Museum of Art.

  • Around 434 kilometres north-east of Philadelphia, Boston is another essential stop in the United States. Experience the best of this destination with a visit to Museum of Fine Arts Boston, Freedom Trail and USS Constitution Museum.

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.