Cheap flights from London to Ontario (USA)

from as little as £372

7 nights in Ontario (USA), departing London Heathrow on 27 / Jan / 2026 with British Airways (price found 20 hours ago)

Subject to availability, prices correct of the last 24 hours
Ontario (USA)

The London / Ontario (USA) route

All 8752 km of it

Cheap flight deals for this route

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Ontario (USA) flight facts

What you need to know

Alternative flights from the UK to Ontario (USA)

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Ontario (USA)

Today alone, Netflights has searched over 148 flights. 27 / Jan / 2026 is currently the lowest priced day of the year to fly the London/Ontario (USA) route. There are around 29 flights on any given week from the UK to Ontario (USA) and the cheapest month to fly right now is January.

Not suitable? Try running another search or viewing all cheap flight deals.

Min / Max Temperature (°C)
LOWEST

6 °C

AVG

19 °C

HIGHEST

34 °C

Rainfall (mm)
LOWEST

2.5 mm

AVG

31.5 mm

HIGHEST

86.4 mm

Key facts about Ontario (USA)

How to get cheap flights from London to Ontario (USA)

Tips and advice from our flight experts

Find a good deal on your flight from London to Ontario (USA) with Netflights. 29 flights go via this route every week, and we've collected them all to help you find the best flight deal. If you want to keep your options open, take a look at flights from another airport in London.

The most popular airlines for this route are Virgin Atlantic, Virgin Atlantic & British Airways, while London Heathrow (LHR) is the most popular departure airport in the city. But when you fly is just as important as where you fly from. Search by month to find out when flights are at the priciest and their cheapest.

Last-minute deals can be cheaper, but it's risky. It's best to book flights to Ontario (USA) in advance to avoid disappointment. British Airways usually have the lowest prices, so keep an eye out for their flights. Flights from London to Ontario (USA) generally take about 18 hrs 5 mins.

Today, we’ve scanned 148 flights, to help you see all the options for your trip to Ontario (USA). Once you’ve chosen your flight, why not check out our deals on accommodation and car hire? You’ll find lots of hotels in the USA, including some close to the airport – perfect if you're arriving late or leaving early.

Other popular destinations near Ontario (USA)

Where other people are flying to

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