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

Return flights

22 Apr - 21 May	Air China
07 Apr - 20 May	Air China
20 Apr - 22 May	Air China
07 Apr - 10 May	Air China
20 Apr - 11 May	Air China
21 Apr - 20 May	Air China
18 Apr - 10 May	Air China
07 Apr - 12 May	Air China
21 Apr - 14 May	Air China
07 Apr - 11 May	Air China
16 Apr - 28 Apr	Air India
13 Apr - 27 Apr	Air India
23 Apr - 29 Apr	Air India
09 Apr - 28 Apr	Air India
22 Apr - 27 Apr	Air India
13 Apr - 28 Apr	Air India
23 Apr - 27 Apr	Air India
21 Apr - 29 Apr	Air India
06 Apr - 29 Apr	Air India
20 Apr - 29 Apr	Air India

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 426€

Return flights