Cheapest one-way flights from Washington (IAD) to Lisbon (LIS), December

10 dates in December, from $ 362. Book in one tap, or check whether to buy now or wait.

One-wayReturn
Dates, airline, and price
Dates Airline Price
7 Dec Porter Airlines (Canada) Ltd
10 Dec Porter Airlines (Canada) Ltd
9 Dec Porter Airlines (Canada) Ltd
30 Dec Iberia
2 Dec Royal Air Maroc
4 Dec Royal Air Maroc
14 Dec Aer Lingus
3 Dec Turkish Airlines
5 Dec Air Canada
7 Dec TAP
Direct Flight
Powered by

Cheapest deals for the full year

Deals for return flights from Washington to Lisbon in December.

Book a cheap hotel in Lisbon

Cheap car rent in Lisboa

Updated Oct 10, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

Feel free to contact us with any feedback or request another flight research.