Cheapest return flights from Washington to Lisbon in September from $830

Best time to book flights for Washington (DCA) to Lisbon (LIS) flights at AirHint

AirHint found the following cheapest return flights from Washington (DCA) to Lisbon (LIS) in September 2025 (see full year).

Return flights

30 Sep - 07 Oct British Airways
17 Sep - 26 Sep Air Canada
19 Sep - 28 Sep jetBlue
10 Sep - 17 Sep jetBlue
09 Sep - 18 Sep jetBlue
19 Sep - 02 Oct British Airways
01 Sep - 10 Sep Air Canada
11 Sep - 17 Sep jetBlue
05 Sep - 12 Sep jetBlue
05 Sep - 09 Sep jetBlue
03 Sep - 11 Sep TAP
19 Sep - 03 Oct TAP
01 Sep - 15 Sep jetBlue

Also check the deals for one-way flights from Washington to Lisbon in September.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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