AirHint found the following cheapest return flights from Washington (IAD) to Lisbon (LIS) in July 2026 (see full year).

Return flights

05 Jul - 21 Jul	Royal Air Maroc
04 Jul - 11 Jul	Royal Air Maroc
05 Jul - 18 Jul	Royal Air Maroc
08 Jul - 11 Jul	Royal Air Maroc
20 Jul - 24 Jul	Royal Air Maroc
03 Jul - 11 Jul	Royal Air Maroc
14 Jul - 21 Jul	TAP	direct
05 Jul - 21 Jul	TAP	direct
20 Jul - 24 Jul	TAP	direct
27 Jul - 27 Aug	British Airways
05 Jul - 18 Jul	TAP	direct

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