$638 Cheap United flights Washington (IAD) to Lisbon (LIS)

View $638 flight on Thu, Sep 25, 2025Opens in a new window

$638 Cheap United flights Washington (IAD) to Lisbon (LIS)

Prices were available within the past 7 days and start at $638 for one-way flights and $868 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Sep 25 - Sun, Oct 5
IAD
Washington
LIS
Lisbon
$868 Roundtrip, found 1 day ago
$868
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 25 from Washington to Lisbon, returning Sun, Oct 5, priced at $868 found 1 day ago
Flights from Washington (IAD) to Lisbon (LIS)
Origin airport
Washington Dulles Intl.
Destination airport
Humberto Delgado
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, JetBlue Airways, KLM, Lufthansa, Royal Air Maroc, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United
Popular airline
Turkish Airlines
Distance
5732 km
Average flight time
12 hours 18 mins