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

Return flights

28 Jul - 04 Aug	Air Canada
21 Jul - 26 Aug	TAP	direct
23 Jul - 29 Jul	Air Canada
26 Jul - 04 Aug	Air Canada
25 Jul - 02 Aug	Air Canada
12 Jul - 17 Jul	Royal Air Maroc
25 Jul - 03 Aug	Air Canada
14 Jul - 20 Jul	ITA Airways
13 Jul - 20 Jul	ITA Airways
13 Jul - 21 Jul	ITA Airways
30 Jul - 04 Aug	Icelandair
18 Jul - 25 Jul	ITA Airways
20 Jul - 27 Jul	Icelandair
12 Jul - 19 Jul	Lufthansa
16 Jul - 23 Jul	Air Canada
25 Jul - 28 Jul	Royal Air Maroc
29 Jul - 01 Aug	TAP	direct
27 Jul - 02 Aug	Lufthansa
28 Jul - 04 Aug	TAP	direct
27 Jul - 03 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.

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Cheapest return flights from Washington to Lisbon in July from $679

Return flights