Cheapest return flights from Washington to Lisbon in December from 749€

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

Return flights

30 Dec - 12 Jan Icelandair
31 Dec - 07 Jan Icelandair
29 Dec - 04 Jan Frontier Airlines
27 Dec - 01 Jan Frontier Airlines
30 Dec - 12 Jan TAP direct
30 Dec - 06 Jan TAP
31 Dec - 07 Jan TAP direct
28 Dec - 05 Jan Lufthansa
30 Dec - 06 Jan TAP direct
28 Dec - 04 Jan Lufthansa direct

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

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