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

Return flights

01 Apr - 11 Apr	Royal Air Maroc
26 Apr - 03 May	Royal Air Maroc
02 Apr - 09 Apr	Scandinavian Airlines
13 Apr - 30 Apr	Royal Air Maroc
03 Apr - 10 Apr	Scandinavian Airlines
01 Apr - 08 Apr	Turkish Airlines
21 Apr - 28 Apr	Turkish Airlines
27 Apr - 04 May	Iberia
26 Apr - 03 May	TAP	direct
13 Apr - 30 Apr	TAP	direct
04 Apr - 11 Apr	Turkish Airlines
29 Apr - 06 May	TAP	direct
27 Apr - 04 May	TAP	direct
03 Apr - 10 Apr	TAP	direct
10 Apr - 17 Apr	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.

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Cheapest return flights from Washington to Lisbon in April from 485€

Return flights