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

Return flights

04 Mar - 11 Mar	Air Canada
03 Mar - 10 Mar	Air Canada
02 Mar - 09 Mar	Air France
05 Mar - 12 Mar	Air France
06 Mar - 13 Mar	Air France
09 Mar - 16 Mar	Air France
01 Mar - 08 Mar	Air France
11 Mar - 18 Mar	Air France
10 Mar - 17 Mar	Air France
12 Mar - 19 Mar	KLM
25 Mar - 01 Apr	Alaska Airlines
26 Mar - 02 Apr	KLM
31 Mar - 07 Apr	Scandinavian Airlines
30 Mar - 06 Apr	Air France
26 Mar - 03 Apr	Turkish Airlines
29 Mar - 05 Apr	Air Canada
28 Mar - 04 Apr	Air Canada
27 Mar - 03 Apr	Lufthansa
20 Mar - 05 Apr	Lufthansa
28 Mar - 06 Apr	Lufthansa

Also check the deals for one-way flights from Seattle 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 Seattle to Lisbon in March from 399€

Return flights