AirHint found the following cheapest return flights from Bangkok (BKK) to Lisbon (LIS) in August 2025 (see full year).

Return flights

04 Aug - 17 Aug	Turkish Airlines
18 Aug - 25 Aug	Finnair
18 Aug - 22 Aug	Finnair
09 Aug - 16 Aug	Finnair
03 Aug - 13 Aug	Turkish Airlines
02 Aug - 06 Aug	Thai AirAsia
10 Aug - 14 Aug	Scoot Tigerair
16 Aug - 23 Aug	Finnair
08 Aug - 15 Aug	Finnair
23 Aug - 13 Sep	IndiGo
29 Aug - 04 Sep	Finnair
03 Aug - 06 Sep	SWISS
06 Aug - 20 Aug	TAP

Also check the deals for one-way flights from Bangkok to Lisbon in August.

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 Bangkok to Lisbon in August from $942

Return flights