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

Return flights

20 Aug - 10 Sep	KLM
28 Aug - 15 Sep	KLM
31 Aug - 11 Sep	Finnair
25 Aug - 07 Sep	Finnair
30 Aug - 12 Sep	Finnair
13 Aug - 10 Sep	Air France
16 Aug - 10 Sep	KLM
21 Aug - 11 Sep	KLM
13 Aug - 11 Sep	Finnair
11 Aug - 10 Sep	Air France
03 Aug - 16 Aug	Etihad Airways
03 Aug - 10 Aug	Etihad Airways
21 Aug - 25 Aug	Etihad Airways
07 Aug - 17 Aug	Etihad Airways
07 Aug - 27 Aug	Etihad Airways
02 Aug - 16 Aug	easyJet
13 Aug - 27 Aug	Finnair
03 Aug - 30 Aug	Etihad Airways
01 Aug - 08 Aug	Ryanair
19 Aug - 24 Aug	Finnair

Also check the deals for one-way flights from Lisbon to Bangkok 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 Lisbon to Bangkok in August from $869

Return flights