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

Return flights

24 Dec - 29 Jan	KLM
24 Dec - 31 Dec	KLM
25 Dec - 03 Jan	Norse Atlantic Airways (UK)
27 Dec - 03 Jan	British Airways
28 Dec - 04 Jan	British Airways
28 Dec - 03 Jan	British Airways
26 Dec - 04 Jan	Finnair
26 Dec - 03 Jan	Finnair
22 Dec - 02 Jan	British Airways
10 Dec - 20 Dec	British Airways
04 Dec - 10 Dec	TAP

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

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 December from 743€

Return flights