AirHint found the following cheapest return flights from Washington (IAD) to Lisbon (LIS)
in May 2025 (see full year ).
Return flights
12 May
- 19 May
Scandinavian Airlines
545 €
06 May
- 13 May
Scandinavian Airlines
548 €
12 May
- 20 May
Scandinavian Airlines
573 €
26 May
- 02 Jun
Porter Airlines (Canada) Ltd
618 €
27 May
- 03 Jun
Air Transat
619 €
28 May
- 04 Jun
Porter Airlines (Canada) Ltd
620 €
13 May
- 21 May
Air Canada
624 €
08 May
- 12 May
Delta
633 €
03 May
- 10 May
Air France
639 €
07 May
- 14 May
Turkish Airlines
645 €
13 May
- 20 May
Air Canada
649 €
11 May
- 19 May
Lufthansa
652 €
15 May
- 23 May
Air France
654 €
27 May
- 12 Jun
Icelandair
663 €
25 May
- 01 Jun
Air Transat
711 €
29 May
- 05 Jun
Air Transat
727 €
30 May
- 06 Jun
Porter Airlines (Canada) Ltd
741 €
19 May
- 12 Jun
Icelandair
743 €
21 May
- 04 Jun
Porter Airlines (Canada) Ltd
789 €
16 May
- 01 Jun
Royal Air Maroc
919 €
Also check the deals for one-way flights from Washington to Lisbon in May .
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.