AirHint found the following cheapest return flights from Washington (IAD) to Lisbon (LIS) in March 2026 (see full year).

Return flights

20 Mar - 24 Mar	Air Canada
04 Mar - 15 Mar	Air Canada
17 Mar - 25 Mar	SWISS
19 Mar - 24 Mar	Turkish Airlines
30 Mar - 07 Apr	Lufthansa
11 Mar - 16 Mar	Lufthansa
29 Mar - 09 Apr	Lufthansa
01 Mar - 14 Mar	Royal Air Maroc
16 Mar - 25 Mar	Turkish Airlines
04 Mar - 12 Mar	Turkish Airlines
07 Mar - 13 Mar	Turkish Airlines
19 Mar - 23 Mar	Lufthansa
31 Mar - 08 Apr	Lufthansa
21 Mar - 07 Apr	SWISS
29 Mar - 08 Apr	Turkish Airlines
23 Mar - 05 Apr	Frontier Airlines
31 Mar - 06 Apr	Lufthansa
25 Mar - 02 Apr	Frontier Airlines
22 Mar - 04 Apr	Royal Air Maroc
25 Mar - 05 Apr	Frontier Airlines

Also check the deals for one-way flights from Washington to Lisbon in March.

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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Cheapest return flights from Washington to Lisbon in March from 495€

Return flights