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

Return flights

28 Apr - 07 May	Turkish Airlines
22 Apr - 30 Apr	Scandinavian Airlines
04 Apr - 11 Apr	Scandinavian Airlines
11 Apr - 17 Apr	Turkish Airlines
30 Apr - 04 May	Turkish Airlines
04 Apr - 19 Apr	Scandinavian Airlines
01 Apr - 08 Apr	Turkish Airlines
02 Apr - 09 Apr	Turkish Airlines
03 Apr - 10 Apr	Turkish Airlines
01 Apr - 08 Apr	TAP	direct
04 Apr - 19 Apr	TAP	direct
28 Apr - 07 May	TAP	direct
02 Apr - 09 Apr	TAP	direct
24 Apr - 01 May	TAP	direct
30 Apr - 04 May	TAP	direct

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

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 April from $611

Return flights