Search for cheap flights and last-minute deals with Netflights. We've scanned all the flights from London Heathrow to Chiang Mai, across the ten airlines that offer this route. We've found that 07 / Sep / 2025 is the cheapest date to travel at the moment, but it's best to go through the results to see which flight suits you.
There are 259 flights from London Heathrow to or via Chiang Mai every week. Out of the ten available airlines, the most popular ones are Thai Airways International, Qatar Airways & Emirates. But that doesn’t necessarily mean they’ll be the best option for your travel dates. To see as many flights as possible, try widening your search to include other departure airports.
Generally speaking, the flight from London Heathrow to Chiang Mai takes around 18 hrs 45 mins. The fastest flight takes 13 hrs 55 mins to cover the 9022 km distance. You can view all flight times yourself in the results list.
May is normally the cheapest month to fly to Chiang Mai, but it’s important to try different options when you search. Searching by month, for instance, will show you the best time of the week to fly. January is always the most expensive time to fly but, if you check regularly and book early, you have a better chance of getting a good deal.
