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Cheap Flights from London Heathrow to Ontario International

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 R 10,490. Find the lowest prices on one-way and return tickets right here.
Ontario.R 7,242 per passenger.Departing Wed, 3 Feb.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from London Heathrow on Wed, 3 Feb, arriving in Ontario International.Price includes taxes and charges.From R 7,242, select.
Ontario.R 7,394 per passenger.Departing Sat, 14 Nov.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from London Heathrow on Sat, 14 Nov, arriving in Ontario International.Price includes taxes and charges.From R 7,394, select.
Ontario.R 7,462 per passenger.Departing Sat, 17 Oct.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from London Heathrow on Sat, 17 Oct, arriving in Ontario International.Price includes taxes and charges.From R 7,462, select.
Ontario.R 7,783 per passenger.Departing Mon, 28 Sep.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from London Heathrow on Mon, 28 Sep, arriving in Ontario International.Price includes taxes and charges.From R 7,783, select.
Ontario.R 7,785 per passenger.Departing Tue, 9 Mar.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from London Heathrow on Tue, 9 Mar, arriving in Ontario International.Price includes taxes and charges.From R 7,785, select.
Ontario.R 7,809 per passenger.Departing Thu, 21 Jan.One-way flight with Alaska Airlines.Outbound indirect flight with Alaska Airlines, departs from London Heathrow on Thu, 21 Jan, arriving in Ontario International.Price includes taxes and charges.From R 7,809, select.
Ontario.R 7,957 per passenger.Departing Sat, 12 Dec.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Sat, 12 Dec, arriving in Ontario International.Price includes taxes and charges.From R 7,957, select.
Ontario.R 8,126 per passenger.Departing Wed, 26 Aug.One-way flight with Aer Lingus.Outbound indirect flight with Aer Lingus, departs from London Heathrow on Wed, 26 Aug, arriving in Ontario International.Price includes taxes and charges.From R 8,126, select.
Ontario.R 8,233 per passenger.Departing Wed, 7 Apr.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Wed, 7 Apr, arriving in Ontario International.Price includes taxes and charges.From R 8,233, select.
Ontario.R 8,425 per passenger.Departing Mon, 3 May.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Mon, 3 May, arriving in Ontario International.Price includes taxes and charges.From R 8,425, select.
Ontario.R 8,425 per passenger.Departing Tue, 1 Jun.One-way flight with British Airways.Outbound indirect flight with British Airways, departs from London Heathrow on Tue, 1 Jun, arriving in Ontario International.Price includes taxes and charges.From R 8,425, select.
Ontario.R 10,323 per passenger.Departing Mon, 19 Jul.One-way flight with Iberia.Outbound indirect flight with Iberia, departs from London Heathrow on Mon, 19 Jul, arriving in Ontario International.Price includes taxes and charges.From R 10,323, select.
Ontario.R 17,860 per passenger.Departing Tue, 28 Jul.One-way flight with Virgin Atlantic.Outbound indirect flight with Virgin Atlantic, departs from London Heathrow on Tue, 28 Jul, arriving in Ontario International.Price includes taxes and charges.From R 17,860, 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 February.
Jul
from R 17,860
Aug
from R 8,126
Sep
from R 7,783
Oct
from R 7,462
Nov
from R 7,394
Dec
from R 7,957
Jan
from R 7,809
Feb
from R 7,242
Mar
from R 7,785
Apr
from R 8,233
May
from R 8,425
Jun
from R 8,425

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 R 7,242
Search flights

San Bernardino Norton AFB

39km from central Ontario
from R 9,229
Search flights

Santa Ana John Wayne

48km from central Ontario
from R 7,781
Search flights

Long Beach Municipal

54km from central Ontario
from R 8,181
Search flights

Hawthorne

65km from central Ontario
from R 19,817
Search flights

Burbank

67km from central Ontario
from R 8,009
Search flights

Los Angeles International

71km from central Ontario
Cheapest
from R 5,665
Search flights

London to Ontario: Flight information

The things to know before you go.
Cheapest flight foundR 7,242
Cheapest month to flyFebruary

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 R 10,095. 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 R 10,095.
As of July 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 September.
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, 8 September 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

How to find the cheapest flights from London Heathrow Airport (LHR) to Ontario International Airport (ONT)

  • The lowest price we've seen for a one-way London Heathrow Airport to Ontario International Airport flight is R 7,242. A round-trip fare right now is R 10,095. Depending on the availability and when you book, these fares may change.

  • It's often best to book ahead of time if you want to get cheap tickets from LHR to ONT. That's because airlines adjust prices based on demand, which tends to increase closer to departure.

  • If you can be flexible with your travel plans, try using the 'Whole month' tool. It'll find the cheapest price in every month when looking for your flight from London Heathrow Airport to Ontario International Airport.

  • Cut down on the time spent looking for cheap flights from LHR to ONT by creating a Price Alert. You'll get an email or notification through the app when a special offer becomes available.

  • Tailor your trip using filters. Select your preferred arrival and departure times, airlines and total journey duration. You can also sort your results by 'Fastest,' 'Cheapest' or 'Best' flights from London Heathrow Airport to Ontario 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 (61ºF) and 36ºC (97ºF). 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 (39ºF) and 24ºC (75ºF) 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.