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

Return flights

29 Jul - 05 Aug	KLM
26 Jul - 07 Aug	Icelandair
28 Jul - 14 Aug	KLM
28 Jul - 04 Aug	KLM
28 Jul - 07 Aug	Lufthansa
31 Jul - 07 Aug	Delta
28 Jul - 14 Aug	TAP	direct
30 Jul - 06 Aug	United
27 Jul - 03 Aug	TAP
28 Jul - 07 Aug	TAP	direct
16 Jul - 25 Jul	ITA Airways
22 Jul - 26 Jul	SWISS
16 Jul - 23 Jul	SWISS
21 Jul - 31 Jul	Iberia
23 Jul - 29 Jul	Iberia
17 Jul - 24 Jul	Icelandair
24 Jul - 28 Jul	LOT
21 Jul - 28 Jul	Lufthansa
19 Jul - 23 Jul	Icelandair
22 Jul - 27 Jul	American Airlines

Also check the deals for one-way flights from Chicago 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 Chicago to Lisbon in July from $676

Return flights