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Cheap Flights from London Heathrow to Ontario International

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      Travellers and cabin class, 1 Adult, Economy

      Compare London Heathrow 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 London Heathrow to Ontario International

      Looking for a cheap last-minute deal or the best return flight from London Heathrow Airport to Ontario International Airport? If you want to travel next month, return fares start from Rs151,148. Find the lowest prices on one-way and return tickets right here.
      Ontario.Rs132,670 per passenger.Departing Sun, 6 Dec.One-way flight with Vueling Airlines.Outbound indirect flight with Vueling Airlines, departs from London Heathrow on Sun, 6 Dec, arriving in Ontario International.Price includes taxes and charges.From Rs132,670, select.
      Ontario.Rs136,449 per passenger.Departing Tue, 23 Feb.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from London Heathrow on Tue, 23 Feb, arriving in Ontario International.Price includes taxes and charges.From Rs136,449, select.
      Ontario.Rs137,976 per passenger.Departing Wed, 4 Nov.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from London Heathrow on Wed, 4 Nov, arriving in Ontario International.Price includes taxes and charges.From Rs137,976, select.
      Ontario.Rs138,108 per passenger.Departing Fri, 23 Oct.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from London Heathrow on Fri, 23 Oct, arriving in Ontario International.Price includes taxes and charges.From Rs138,108, select.
      Ontario.Rs142,018 per passenger.Departing Mon, 8 Mar.One-way flight with Iberia.Outbound indirect flight with Iberia, departs from London Heathrow on Mon, 8 Mar, arriving in Ontario International.Price includes taxes and charges.From Rs142,018, select.
      Ontario.Rs142,299 per passenger.Departing Mon, 11 Jan.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Mon, 11 Jan, arriving in Ontario International.Price includes taxes and charges.From Rs142,299, select.
      Ontario.Rs143,233 per passenger.Departing Sun, 4 Jul.One-way flight with Iberia.Outbound indirect flight with Iberia, departs from London Heathrow on Sun, 4 Jul, arriving in Ontario International.Price includes taxes and charges.From Rs143,233, select.
      Ontario.Rs143,233 per passenger.Departing Wed, 7 Apr.One-way flight with Iberia.Outbound indirect flight with Iberia, departs from London Heathrow on Wed, 7 Apr, arriving in Ontario International.Price includes taxes and charges.From Rs143,233, select.
      Ontario.Rs143,233 per passenger.Departing Sun, 9 May.One-way flight with Iberia.Outbound indirect flight with Iberia, departs from London Heathrow on Sun, 9 May, arriving in Ontario International.Price includes taxes and charges.From Rs143,233, select.
      Ontario.Rs143,545 per passenger.Departing Thu, 3 Jun.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Thu, 3 Jun, arriving in Ontario International.Price includes taxes and charges.From Rs143,545, select.
      Ontario.Rs169,719 per passenger.Departing Mon, 28 Sep.One-way flight with Icelandair.Outbound indirect flight with Icelandair, departs from London Heathrow on Mon, 28 Sep, arriving in Ontario International.Price includes taxes and charges.From Rs169,719, select.
      Ontario.Rs282,207 per passenger.Departing Sun, 1 Aug.One-way flight with KLM.Outbound indirect flight with KLM, departs from London Heathrow on Sun, 1 Aug, arriving in Ontario International.Price includes taxes and charges.From Rs282,207, select.

      Find the cheapest month to fly from London Heathrow to Ontario International

      We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like London Heathrow to Ontario International flights are currently cheapest in December.
      Sep
      from Rs169,719
      Oct
      from Rs138,108
      Nov
      from Rs137,976
      Dec
      from Rs132,670
      Jan
      from Rs142,299
      Feb
      from Rs136,449
      Mar
      from Rs142,018
      Apr
      from Rs143,233
      May
      from Rs143,233
      Jun
      from Rs143,545
      Jul
      from Rs143,233
      Aug
      from Rs282,207

      London Heathrow to Ontario International: Alternative routes

      Compare routes from London Heathrow 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
      Closest
      from Rs132,670
      Search flights

      San Bernardino Norton AFB

      39km from central Ontario
      from Rs186,099
      Search flights

      Santa Ana John Wayne

      48km from central Ontario
      from Rs131,546
      Search flights

      Long Beach Municipal

      54km from central Ontario
      from Rs150,288
      Search flights

      Hawthorne

      65km from central Ontario
      from Rs233,159
      Search flights

      Burbank

      67km from central Ontario
      from Rs135,879
      Search flights

      Los Angeles International

      71km from central Ontario
      Cheapest
      from Rs116,631
      Search flights

      London to Ontario: Flight information

      The things to know before you go.
      Cheapest flight foundRs132,670
      Cheapest month to flyDecember

      Finding cheap flights from London Heathrow to Ontario International: Frequently asked questions

      The best price we found for a return flight from London Heathrow to Ontario International is Rs151,148. 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 London Heathrow to Ontario International. But we found flights with one or more stops from Rs151,148.
      As of September 2026, there are no flights flying from London Heathrow to Ontario International.
      The cheapest month to fly from London Heathrow to Ontario International is usually October.
      After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from London Heathrow Airport to Ontario International Airport on Tuesday, 13 October 2026.
      No airlines currently offer direct flights between London Heathrow 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, Air France offers the cheapest flight tickets to Ontario International.

      Travelling from London Heathrow Airport (LHR) to Ontario International Airport (ONT): what you need to know

      • Ontario's timezone is UTC-8, which makes Ontario eight hours behind London.

      • Arrive at the airport on time so you don't miss your LHR to ONT flight. Be there at least two hours ahead for international flights and an hour early for domestic departures to prevent a last-minute sprint to your gate.

      • Be prepared for longer lines during popular months like July. Arriving up to four hours ahead of international flights and two hours for a domestic departure is a wise move.

      • We make it a piece of cake to book a flight with a stopover. To see your options for tickets from London Heathrow Airport to Ontario International Airport, uncheck 'Direct flights only.' Then, choose a flight that has a stop long enough to explore your chosen city. Stopovers between LHR and ONT include:

        • Denver International Airport

        • Seattle / Tacoma International Airport

        • Harry Reid International Airport

      Handy information about London Heathrow Airport (LHR)

      • 78% of flights that leave from London Heathrow Airport reach their destination on schedule.

      • Central London to London Heathrow Airport is around 24 kilometres. Depending on traffic, it'll take you about 45 minutes to get there if you're catching a taxi, ride-sharing or driving.

      • Catching public transport? Expect a trip time of around 25 minutes.

      • Get your break off to a stress-free start by staying near LHR. Whether you're catching an early flight from London Heathrow Airport to Ontario International Airport or just don't like being rushed, these stays are the answer:

      Arriving at Ontario International Airport (ONT)

      Getting from Ontario International Airport (ONT) to central Ontario

      • The address for ONT is 2900 E. Airport Drive.

      • Ontario International Airport to central Ontario has a drive time of around 15 minutes. It's approximately 10 kilometres away.

      • When travelling by public transport, expect a journey of roughly 45 minutes.

      When to fly to Ontario International Airport (ONT)

      • It's time to work out your trip dates for your flight from London Heathrow Airport to Ontario International Airport. July is the most popular month to visit Ontario. If you'd like a more relaxed vibe, go in March.

      • The warmest month in Ontario is August, with temperatures ranging between 16ºC and 36ºC. Lock in your flights from London Heathrow Airport to Ontario International Airport in this month if this is the type of weather you like.

      • Look for cheap tickets from LHR to ONT in February if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between 4ºC and 24ºC on average.

      Explore more of the United States

      • Ontario has plenty going for it, but there are so many other corners of the United States you should also see. About 56 kilometres west of Ontario, a trip to Los Angeles will keep you busy. Start with leading sights like Hollywood Sign, Universal Studios Hollywood and Hollywood Bowl.

      • Around 153 kilometres south of Ontario, San Diego is another favourite stop in the United States. No visit is complete without checking out San Diego Zoo, San Diego Balboa Park and USS Midway Museum.

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