Cheap flights from London-Heathrow to Sarnia
Cheap return flights from London-Heathrow to Sarnia
Find the best deals
All prices shown are per person based on return flights only. Prices found in the last 48 hours.
Sarnia flight facts
What you need to know
What are the cheapest airlines?
- Air Canada
- WestJet
- British Airways
These airlines usually offer the cheapest flights from London-Heathrow to Sarnia.
What airlines fly indirectly?
- Air France
- KLM
- Lufthansa
These airlines fly from London-Heathrow to Sarnia, but you’ll have at least one layover.
How long is the flight?
12 hours
This is the shortest flight time from London-Heathrow to Sarnia.
Alternative flights from the UK to Sarnia
Check out prices for other routes
Alternative flights from London-Heathrow
You might find cheaper flights nearby
Today alone, Netflights has searched over five flights. 05 / Feb / 2026 is currently the lowest priced day of the year to fly the London-Heathrow/Sarnia route. There are around 35 flights on any given week from the UK to Sarnia and the cheapest month to fly right now is February. Not suitable? Try running another search or viewing all cheap flight deals.
How to get cheap flights from London-Heathrow to Sarnia
Tips and advice from our flight experts
You've searched for flights from London-Heathrow to Sarnia. We've found 25 flights and compared them to give you the best offer. Air Canada is, on average, the cheapest for this route. Look out for their deals! The cheapest offer we've found is a one-way ticket for £57 from London-Heathrow to Sarnia on 07/06/2026 at 01:40.
We've scanned hundreds of airfares from various airlines across the globe. In total, we've found 5 airlines that operate the 6,500 km flight from London-Heathrow to Sarnia.
To find the best offers, consider booking 2-3 months in advance or looking for last-minute deals. The best time to fly is during the shoulder seasons. Air Canada often has competitive prices, and the average flight duration is around 12 hours. After selecting an offer, fill out your information and proceed to payment. Don't forget to check our flight + hotel service to save time and money!
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