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

Return flights

27 Jul - 11 Aug	Air Canada
08 Jul - 15 Jul	Air Canada
30 Jul - 05 Aug	Air Canada
22 Jul - 29 Jul	United
15 Jul - 22 Jul	United
14 Jul - 24 Jul	United
18 Jul - 21 Jul	jetBlue
13 Jul - 24 Jul	United
23 Jul - 30 Jul	Delta
23 Jul - 05 Aug	Delta
20 Jul - 31 Jul	Delta
15 Jul - 28 Jul	Air Canada
20 Jul - 09 Aug	Air Canada
04 Jul - 07 Jul	Air Canada
30 Jul - 08 Aug	United
27 Jul - 07 Aug	British Airways
29 Jul - 01 Aug	Air Canada
22 Jul - 12 Aug	TAP
23 Jul - 04 Aug	Air Canada
30 Jul - 04 Aug	TAP

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

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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Cheapest return flights from Washington to Lisbon in July from $812

Return flights