When flying from Heathrow to Sarnia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Heathrow and Sarnia for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.
One of the carriers operating flights from London Heathrow to Sarnia that may be offering flexible change policies is Air Canada. Our site will let you filter for all airlines offering greater flexibility due to COVID-19.
When travelling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Heathrow is roughly greater than that of Sarnia. You can assume this to be the case over the next 21 days.
We forecast the temperature to be around the 25 °Cs in July, on average. The temperature in Sarnia is generally hotter than in Heathrow. Book flights in a timely manner in correlation to your departure date.