Cheap flights from London Heathrow Airport to Sylhet from £420

If you’re not able to fly to Sylhet in September, then April is your next best option. Flight prices from London Heathrow Airport to Sylhet during April average around £850.

The cheapest day to depart on your flight to Sylhet is on a Thursday when prices can be found for as low as £879. This is often the case because there is less demand to fly during this day of the week. On the other hand, Tuesday is the most expensive day to depart from London Heathrow Airport because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £957.

Our data shows that the cheapest London Heathrow Airport to Sylhet flights are usually those with departure times in the evening. Our users have found flights to Sylhet in the evening for as low as £877. Try not to purchase tickets in the afternoon because they tend to be around £929. Of course, these prices can vary depending on the time of year and what airport you fly to.

Fly from London Heathrow to Sylhet Osmani Intl for the best London Heathrow - Sylhet Osmani Intl flight prices

You are more likely to see cheaper flights to Sylhet from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Sylhet for around £967 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sylhet from London Heathrow Airport for as low as £860 on momondo.

There are 3 cabin classes available to choose from on London Heathrow Airport to Sylhet flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 13% on your flight if you consider stops on a London Heathrow Airport to Sylhet flight.

As of October 2026, prices for London Heathrow Airport to Sylhet flights are approximately 19% cheaper when compared to flights at the same time last year.

Historically, on average around 27% of flights between London and Sylhet have experienced a delay on any given week. The average delay length over the past 12 months has been 197 minutes.

Generally, flights departing in the evening tend to experience fewer delays. Flights departing in the morning have, in the past, seen delays more frequently in comparison.

Saturday is statistically the day of the week that experiences the fewest delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

According to our data, Biman Bangladesh have had the fewest delays on this route over the last 12 months, with about 27% of their flights experiencing any sort of delay.