AirHint found the following cheapest one-way flights from Chicago (ORD) to Zurich (ZRH) in August 2025 (see full year).

One-Way flights

12 Aug	Spirit Airlines
24 Aug	Frontier Airlines
31 Aug	Frontier Airlines
06 Aug	Spirit Airlines
03 Aug	TAP
08 Aug	Spirit Airlines
01 Aug	Frontier Airlines
22 Aug	TAP
06 Aug	SWISS	direct
05 Aug	SWISS	direct

Also check the deals for return flights from Chicago to Zurich in August.

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 one-way flights from Chicago to Zurich in August from 244€

One-Way flights