August is by far the best month, wherein you can get cheapest flights for Washington to Lisbon. Meanwhile, is perceived as the expensive month due to the varying factors. That’s why it’s highly advised to make advanced online flight booking to save huge amounts of money.
Disclaimer - All the mentioned fares were found within last 48 hrs. The displayed fares are based on historical data and are subject to change. The fares cannot be guaranteed at the time of booking.
IAD
21:05
Washington Washington Dulles International Airport
Wed , 03 Sep 2025
LIS
12:15
Lisbon Humberto Delgado Airport
Thu, 04 Sep 2025
IAD
21:05
Washington Washington Dulles International Airport
Tue , 02 Sep 2025
LIS
17:40
Lisbon Humberto Delgado Airport
Wed, 03 Sep 2025
IAD
17:20
Washington Washington Dulles International Airport
Wed , 03 Sep 2025
LIS
10:45
Lisbon Humberto Delgado Airport
Thu, 04 Sep 2025
IAD
17:00
Washington Washington Dulles International Airport
Tue , 02 Sep 2025
LIS
05:20
Lisbon Humberto Delgado Airport
Wed, 03 Sep 2025
IAD
13:30
Washington Washington Dulles International Airport
Tue , 02 Sep 2025
LIS
15:30
Lisbon Humberto Delgado Airport
Wed, 03 Sep 2025
IAD
17:50
Washington Washington Dulles International Airport
Wed , 03 Sep 2025
LIS
06:10
Lisbon Humberto Delgado Airport
Thu, 04 Sep 2025
IAD
22:05
Washington Washington Dulles International Airport
Tue , 02 Sep 2025
LIS
16:10
Lisbon Humberto Delgado Airport
Wed, 03 Sep 2025
IAD
17:20
Washington Washington Dulles International Airport
Tue , 02 Sep 2025
LIS
21:35
Lisbon Humberto Delgado Airport
Wed, 03 Sep 2025
IAD
13:30
Washington Washington Dulles International Airport
Wed , 03 Sep 2025
LIS
15:15
Lisbon Humberto Delgado Airport
Thu, 04 Sep 2025
IAD
21:40
Washington Washington Dulles International Airport
Tue , 02 Sep 2025
LIS
23:35
Lisbon Humberto Delgado Airport
Wed, 03 Sep 2025
IAD
22:05
Washington Washington Dulles International Airport
Wed , 03 Sep 2025
LIS
20:40
Lisbon Humberto Delgado Airport
Thu, 04 Sep 2025