Cheapest return flights from Seattle to Lisbon in March from $621

Best time to book flights for Seattle (SEA) to Lisbon (LIS) flights at AirHint

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

Return flights

16 Mar - 23 Mar United
17 Mar - 24 Mar United
15 Mar - 22 Mar Lufthansa
14 Mar - 21 Mar Lufthansa
18 Mar - 25 Mar United
24 Mar - 31 Mar Lufthansa
13 Mar - 20 Mar Lufthansa
19 Mar - 26 Mar United
23 Mar - 30 Mar Lufthansa
20 Mar - 27 Mar United
25 Mar - 01 Apr Lufthansa

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

Skyscanner

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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