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

Return flights

17 Jan - 25 Jan	Scandinavian Airlines
21 Jan - 28 Jan	TAP	direct
20 Jan - 31 Jan	TAP	direct
30 Jan - 05 Feb	TAP	direct
28 Jan - 31 Jan	TAP	direct
30 Jan - 06 Feb	TAP	direct
30 Jan - 01 Feb	Royal Air Maroc
25 Jan - 01 Feb	TAP	direct
29 Jan - 05 Feb	TAP	direct
31 Jan - 07 Feb	TAP	direct
17 Jan - 23 Jan	Scandinavian Airlines
14 Jan - 17 Jan	Air Canada
22 Jan - 27 Jan	Turkish Airlines
16 Jan - 22 Jan	Air Canada
16 Jan - 19 Jan	Air Canada
15 Jan - 19 Jan	Air Canada
30 Jan - 01 Feb	TAP	direct
27 Jan - 03 Feb	TAP

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 $485

Return flights