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

Return flights

01 Dec - 11 Dec	easyJet
04 Dec - 19 Dec	easyJet
02 Dec - 09 Dec	Ryanair
10 Dec - 23 Dec	Iberia
02 Dec - 11 Dec	easyJet
08 Dec - 12 Dec	easyJet
02 Dec - 13 Dec	Iberia
01 Dec - 30 Jan	easyJet
02 Dec - 16 Dec	Iberia
04 Dec - 11 Dec	Ryanair
01 Dec - 10 Dec	Iberia
01 Dec - 28 Jan	easyJet
16 Dec - 07 Jan	easyJet
22 Dec - 16 Jan	easyJet
30 Dec - 16 Jan	TAP
03 Dec - 28 Jan	KLM
11 Dec - 22 Jan	easyJet
29 Dec - 05 Jan	easyJet
17 Dec - 15 Jan	Air Europa
29 Dec - 29 Jan	Finnair

Also check the deals for one-way flights from Lisbon to Bangkok 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 Lisbon to Bangkok in December from $647

Return flights