AirHint found the following cheapest return flights from Spokane (GEG) to Lisbon (LIS) in September 2025 (see full year).

Return flights

24 Sep - 01 Oct	Hawaiian Airlines
11 Sep - 19 Sep	Hawaiian Airlines
11 Sep - 23 Sep	Hawaiian Airlines
10 Sep - 22 Sep	Hawaiian Airlines
11 Sep - 22 Sep	Hawaiian Airlines
11 Sep - 21 Sep	Hawaiian Airlines

Also check the deals for one-way flights from Spokane to Lisbon in September.

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 Spokane to Lisbon in September from $768

Return flights