AirHint found the following cheapest return flights from Washington (IAD) to Lisbon (LIS) in October 2026 (see full year).
Return flights
| 28 Oct - 03 Nov | Royal Air Maroc | ||
| 11 Oct - 17 Oct | Royal Air Maroc | ||
| 14 Oct - 21 Oct | Iberia | ||
| 14 Oct - 21 Oct | TAP | direct | |
| 01 Oct - 15 Oct | Aer Lingus | ||
| 07 Oct - 21 Oct | Delta |
Also check the deals for one-way flights from Washington to Lisbon in October.
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