If you're looking to fly from London Heathrow to Chiang Rai, you might like to know that 07 / Jan / 2026 currently has the cheapest flights. At the moment, there are two airlines flying to Chiang Rai. Go through the results to find the right flights for you – you can adjust the filters to see find even more flights to Chiang Rai.
There are 24 flights from London Heathrow to or via Chiang Rai every week. Out of the two available airlines, the most popular ones are Lufthansa & Thai Airways International. 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.
The distance between London Heathrow to Chiang Rai is 8979 km. Normally, it takes about 16 hrs 40 mins to fly, and you can definitely expect the journey to be at least 14 hrs 50 mins. You can see the various flight times in the results.
December is normally the cheapest month to fly to Chiang Rai, 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. April 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.
