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

Return flights

12 Jan - 16 Jan	Scandinavian Airlines
22 Jan - 26 Feb	Scandinavian Airlines
17 Jan - 24 Jan	TAP	direct
17 Jan - 26 Jan	TAP	direct
15 Jan - 22 Jan	TAP	direct
28 Jan - 03 Feb	Scandinavian Airlines
10 Jan - 17 Jan	Scandinavian Airlines
16 Jan - 24 Jan	Royal Air Maroc
28 Jan - 03 Feb	TAP	direct
15 Jan - 06 Feb	TAP	direct
20 Jan - 27 Jan	TAP	direct
30 Jan - 06 Feb	TAP	direct
15 Jan - 07 Feb	Turkish Airlines
10 Jan - 17 Jan	TAP	direct
02 Jan - 24 Jan	TAP	direct
07 Jan - 12 Jan	TAP	direct
15 Jan - 07 Feb	TAP	direct
22 Jan - 26 Feb	TAP	direct
25 Jan - 01 Feb	TAP	direct

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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Cheapest return flights from Washington to Lisbon in January from $451

Return flights