Cheapest one-way flights from Washington (IAD) to Lisbon (LIS), September

Select a price to book. see full year.

Dates, airline, and price
Dates Airline Price
06 Sep Icelandair
15 Sep Porter Airlines (Canada) Ltd
29 Sep Icelandair
01 Sep Icelandair
12 Sep Icelandair
19 Sep Icelandair
10 Sep Porter Airlines (Canada) Ltd
02 Sep Porter Airlines (Canada) Ltd
18 Sep Royal Air Maroc
16 Sep Royal Air Maroc
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deals for return flights from Washington to Lisbon in September.

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Updated Jul 13, 2026.

About these fares

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