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Cheap Flights from Philadelphia (PHL) to Ontario (ONT)

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      Travellers and cabin class, 1 Adult, Economy

      Compare Philadelphia International to Ontario International flight deals

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

      Book the best Ontario International fare with no extra fees

      Flight deals from Philadelphia International to Ontario International

      Looking for a cheap last-minute deal or the best return flight from Philadelphia International Airport to Ontario International Airport? If you want to travel next month, return fares start from $336. Find the lowest prices on one-way and return tickets right here.
      Ontario.$336 per passenger.Departing Wed, 21 Oct, returning Sat, 24 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Wed, 21 Oct, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Sat, 24 Oct, arriving in Philadelphia International.Price includes taxes and charges.From $336, select.
      Ontario.$339 per passenger.Departing Wed, 2 Dec, returning Tue, 8 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Wed, 2 Dec, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 8 Dec, arriving in Philadelphia International.Price includes taxes and charges.From $339, select.
      Ontario.$406 per passenger.Departing Thu, 14 Jan, returning Fri, 22 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Thu, 14 Jan, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 22 Jan, arriving in Philadelphia International.Price includes taxes and charges.From $406, select.
      Ontario.$408 per passenger.Departing Fri, 5 Feb, returning Mon, 8 Feb.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Fri, 5 Feb, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 8 Feb, arriving in Philadelphia International.Price includes taxes and charges.From $408, select.
      Ontario.$431 per passenger.Departing Sun, 24 Jan, returning Wed, 3 Feb.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Sun, 24 Jan, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 3 Feb, arriving in Philadelphia International.Price includes taxes and charges.From $431, select.
      Ontario.$442 per passenger.Departing Tue, 15 Dec, returning Tue, 5 Jan.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Tue, 15 Dec, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 5 Jan, arriving in Philadelphia International.Price includes taxes and charges.From $442, select.
      Ontario.$472 per passenger.Departing Fri, 13 Nov, returning Tue, 17 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Philadelphia International on Fri, 13 Nov, arriving in Ontario International.Inbound indirect flight with Frontier Airlines, departs from Ontario International on Tue, 17 Nov, arriving in Philadelphia International.Price includes taxes and charges.From $472, select.
      Ontario.$475 per passenger.Departing Tue, 17 Nov, returning Wed, 2 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Tue, 17 Nov, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 2 Dec, arriving in Philadelphia International.Price includes taxes and charges.From $475, select.
      Ontario.$476 per passenger.Departing Sat, 24 Oct, returning Mon, 2 Nov.Return flight with Delta.Outbound indirect flight with Delta, departs from Philadelphia International on Sat, 24 Oct, arriving in Ontario International.Inbound indirect flight with Delta, departs from Ontario International on Mon, 2 Nov, arriving in Philadelphia International.Price includes taxes and charges.From $476, select.
      Ontario.$514 per passenger.Departing Fri, 23 Apr, returning Wed, 28 Apr.Return flight with United.Outbound indirect flight with United, departs from Philadelphia International on Fri, 23 Apr, arriving in Ontario International.Inbound indirect flight with United, departs from Ontario International on Wed, 28 Apr, arriving in Philadelphia International.Price includes taxes and charges.From $514, select.
      Ontario.$514 per passenger.Departing Mon, 15 Mar, returning Tue, 16 Mar.Return flight with United.Outbound indirect flight with United, departs from Philadelphia International on Mon, 15 Mar, arriving in Ontario International.Inbound indirect flight with United, departs from Ontario International on Tue, 16 Mar, arriving in Philadelphia International.Price includes taxes and charges.From $514, select.
      Ontario.$518 per passenger.Departing Thu, 29 Apr, returning Sun, 2 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Thu, 29 Apr, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 2 May, arriving in Philadelphia International.Price includes taxes and charges.From $518, select.
      Ontario.$518 per passenger.Departing Thu, 13 May, returning Thu, 20 May.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Thu, 13 May, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 20 May, arriving in Philadelphia International.Price includes taxes and charges.From $518, select.
      Ontario.$525 per passenger.Departing Sat, 27 Feb, returning Wed, 3 Mar.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Sat, 27 Feb, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Wed, 3 Mar, arriving in Philadelphia International.Price includes taxes and charges.From $525, select.
      Ontario.$545 per passenger.Departing Mon, 11 Jan, returning Thu, 11 Mar.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Mon, 11 Jan, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 11 Mar, arriving in Philadelphia International.Price includes taxes and charges.From $545, select.
      Ontario.$573 per passenger.Departing Sat, 31 Oct, returning Tue, 1 Dec.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Philadelphia International on Sat, 31 Oct, arriving in Ontario International.Inbound indirect flight with Southwest Airlines, departs from Ontario International on Tue, 1 Dec, arriving in Philadelphia International.Price includes taxes and charges.From $573, select.
      How did we find these deals? The deals you see here are the lowest prices for flight tickets from Philadelphia International to Ontario International found in the last 4 days, and are subject to change and availability.

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

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Philadelphia International to Ontario International flights are currently cheapest in October.
      Sep
      from $887
      Oct
      from $336
      Nov
      from $472
      Dec
      from $339
      Jan
      from $406
      Feb
      from $408
      Mar
      from $514
      Apr
      from $514
      May
      from $518
      Jun
      Find prices
      Jul
      Find prices
      Aug
      Find prices

      Philadelphia International to Ontario International: Alternative routes

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

      Ontario International

      4km from central Ontario
      ClosestCheapest
      from $336
      Search flights

      San Bernardino Norton AFB

      39km from central Ontario
      Search flights

      Santa Ana John Wayne

      48km from central Ontario
      from $469
      Search flights

      Long Beach Municipal

      54km from central Ontario
      from $616
      Search flights

      Hawthorne

      65km from central Ontario
      Search flights

      Burbank

      67km from central Ontario
      from $509
      Search flights

      Los Angeles International

      71km from central Ontario
      from $368
      Search flights

      Philadelphia to Ontario: Flight information

      The things to know before you go.
      Cheapest flight found$336
      Cheapest month to flyOctober

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

      The best price we found for a return flight from Philadelphia International to Ontario International is $336. 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 Philadelphia International to Ontario International. But we found flights with one or more stops from $336.
      As of September 2026, there are no flights flying from Philadelphia International to Ontario International.
      The cheapest month to fly from Philadelphia International to Ontario International is usually October.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Philadelphia International Airport to Ontario International Airport on Wednesday, 21 October 2026.
      No airlines currently offer direct flights between Philadelphia International Airport and Ontario 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 Ontario 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 Ontario 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 Ontario International.

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

      • Ontario's timezone is UTC-8, which makes Ontario three hours behind Philadelphia.

      • Get to the airport on time so you don't miss your PHL to ONT flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to avoid sprinting to your gate.

      • During popular months like August, it's best to get to the airport earlier. Arrive two hours before domestic departures and four hours ahead for international flights whenever you're travelling during peak periods in general.

      • If you'd like to include a stop along the way, simply uncheck 'Direct flights only' when searching for your ticket from Philadelphia International Airport to Ontario International Airport. These are the most popular stopovers between PHL and ONT:

        • Denver International Airport

        • Phoenix Sky Harbour Airport

        • Chicago Midway Airport

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

      • $143 is currently the best price for a one-way Philadelphia International Airport to Ontario International Airport flight. A return flight starts at $336. These prices can change based on availability.

      • It's often best to book early if you're hoping to get cheap tickets from PHL to ONT. That's because flight prices are based on demand, which tends to rise closer to departure.

      • Getting cheap flights from Philadelphia International Airport to Ontario International Airport is easy if you can be flexible with your dates. Use the 'Whole month' search function to see the lowest prices across every month and score a great deal.

      • You don't need to check every day to find out if fares have gone down when you set up a Price Alert. We'll notify you the moment a special offer becomes available on cheap flights from PHL to ONT.

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

      Handy information about Philadelphia International Airport (PHL)

      • You'll find PHL at 8500 Essington Ave.

      • Of all flights departing from Philadelphia International Airport, 77% arrive on time at their destination.

      • To reach Philadelphia International Airport from central Philadelphia, it'll take around 20 minutes by car. Of course, this depends on traffic. It's approximately 18 kilometres from the airport to the city centre.

      • The journey on public transport takes about 30 minutes.

      • Get your holiday off to a leisurely start by staying near PHL. Whether you have an early flight from Philadelphia International Airport to Ontario International Airport or just don't want to be rushed, these stays have you covered:

      Arriving at Ontario International Airport (ONT)

      When to fly to Ontario International Airport (ONT)

      • July is the most popular month for flights from Philadelphia International Airport to Ontario International Airport. To escape the crowds, head to Ontario in March.

      • Book your flight from Philadelphia International Airport to Ontario International Airport for August if you want to go to Ontario during its warmest month. You can expect temperatures of between 16ºC (61ºF) and 36ºC (97ºF).

      • If you like cooler conditions, look for a cheap ticket from PHL to ONT in February. Temperatures average between 4ºC (39ºF) and 24ºC (75ºF) then.

      Explore more of the United States

      • You've seen Ontario, now it's time to explore other corners of the United States. Journey about 56 kilometres west to Los Angeles to tick off its popular sights. From Hollywood Sign to Universal Studios Hollywood and Hollywood Bowl, your itinerary will be busy.

      • San Diego is another standout destination in the United States and is around 153 kilometres south of Ontario. No journey is complete without seeing San Diego Zoo, San Diego Balboa Park and USS Midway Museum.

      Plan smart, explore more

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      Plan the rest of your trip from Philadelphia to Ontario

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