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

Return flights

17 Jul - 21 Jul	SWISS
18 Jul - 22 Jul	SWISS
29 Jul - 05 Aug	United
23 Jul - 30 Jul	United
23 Jul - 29 Jul	United
18 Jul - 26 Jul	Delta
21 Jul - 28 Jul	United
14 Jul - 15 Aug	TAP	direct
14 Jul - 19 Jul	Icelandair
28 Jul - 04 Aug	KLM
16 Jul - 25 Jul	SWISS
26 Jul - 09 Aug	Air Canada
19 Jul - 16 Aug	TAP
26 Jul - 03 Aug	TAP
12 Jul - 21 Jul	SWISS
13 Jul - 21 Jul	SWISS
23 Jul - 03 Aug	Spirit Airlines
18 Jul - 02 Aug	Spirit Airlines
19 Jul - 16 Aug	TAP	direct
19 Jul - 02 Aug	TAP

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 637€

Return flights