Cheapest one-way flights from Washington to Lisbon in December from 211€

AirHint found the following cheapest one-way flights from Washington (IAD) to Lisbon (LIS) in December 2025 (see full year).

One-Way flights

07 Dec Frontier Airlines
05 Dec Frontier Airlines
12 Dec Frontier Airlines
08 Dec Frontier Airlines
09 Dec Frontier Airlines
03 Dec Frontier Airlines
10 Dec Frontier Airlines
31 Dec Frontier Airlines
11 Dec Frontier Airlines
06 Dec Frontier Airlines

Also check the deals for return flights from Washington to Lisbon in December.

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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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