AirHint found the following cheapest return flights from London (LHR) to Bangkok (BKK) in April 2026 (see full year).

Return flights

10 Apr - 26 Apr	Air China
11 Apr - 25 Apr	Air China
17 Apr - 15 May	Air China
12 Apr - 15 May	Air China
06 Apr - 30 Apr	Air China
14 Apr - 28 Apr	Air China
20 Apr - 27 Apr	Air China
09 Apr - 30 Apr	Air China
06 Apr - 27 Apr	Air China
10 Apr - 30 Apr	Air China
17 Apr - 27 Apr	Air China
22 Apr - 02 May	Air China
12 Apr - 10 May	Air China
12 Apr - 20 May	Air China
22 Apr - 26 May	Air China
15 Apr - 01 May	Air China
07 Apr - 02 May	Air China
07 Apr - 15 May	Air China
20 Apr - 15 May	Air China
10 Apr - 25 Apr	Air China

Also check the deals for one-way flights from London to Bangkok in April.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from London to Bangkok in April from $682

Return flights