AirHint found the following cheapest return flights from Seattle (SEA) to Lisbon (LIS) in July 2026 (see full year).
Return flights
| 28 Jul - 09 Aug | Aer Lingus | ||
| 07 Jul - 04 Aug | Aer Lingus | ||
| 17 Jul - 01 Aug | Aer Lingus |
Also check the deals for one-way flights from Seattle to Lisbon in July.
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