AirHint found the following cheapest return flights from Washington (IAD) to Lisbon (LIS) in January 2026 (see full year).

Return flights

21 Jan - 28 Jan	Scandinavian Airlines
25 Jan - 01 Feb	Scandinavian Airlines
14 Jan - 21 Jan	Scandinavian Airlines
15 Jan - 22 Jan	TAP	direct
17 Jan - 24 Jan	TAP	direct
09 Jan - 17 Jan	TAP	direct
19 Jan - 26 Jan	TAP	direct
20 Jan - 27 Jan	TAP	direct
21 Jan - 28 Jan	TAP	direct
23 Jan - 30 Jan	TAP	direct
16 Jan - 23 Jan	TAP	direct
26 Jan - 02 Feb	Scandinavian Airlines
29 Jan - 03 Feb	Scandinavian Airlines
27 Jan - 03 Feb	TAP	direct
28 Jan - 03 Feb	TAP	direct
15 Jan - 07 Feb	TAP	direct
25 Jan - 01 Feb	TAP	direct
29 Jan - 03 Feb	TAP	direct
15 Jan - 06 Feb	SWISS

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

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 Washington to Lisbon in January from 437€

Return flights