AirHint found the following cheapest return flights from Washington (DCA) to Lisbon (LIS) in September 2026 (see full year).
Return flights
| 22 Sep - 06 Oct | Scandinavian Airlines | ||
| 03 Sep - 17 Sep | Scandinavian Airlines | ||
| 01 Sep - 10 Sep | jetBlue | ||
| 25 Sep - 09 Oct | British Airways | ||
| 15 Sep - 15 Oct | TAP |
Also check the deals for one-way flights from Washington to Lisbon in September.
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