AirHint found the following cheapest one-way flights from Washington (IAD) to Lisbon (LIS) in April 2026 (see full year).
One-Way flights
| 18 Apr | Icelandair | ||
| 20 Apr | Icelandair | ||
| 27 Apr | Icelandair | ||
| 26 Apr | Icelandair | ||
| 25 Apr | Icelandair | ||
| 15 Apr | Icelandair | ||
| 05 Apr | Icelandair | ||
| 17 Apr | Royal Air Maroc | ||
| 24 Apr | Royal Air Maroc | ||
| 02 Apr | Frontier Airlines |
Also check the deals for return flights from Washington to Lisbon in April.
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