AirHint found the following cheapest return flights from Seattle (SEA) to Ljubljana (LJU) in October 2025 (see full year).

Return flights

28 Oct - 04 Nov	Hawaiian Airlines
29 Oct - 05 Nov	Hawaiian Airlines
15 Oct - 22 Oct	Air France
22 Oct - 29 Oct	Delta
21 Oct - 28 Oct	KLM
08 Oct - 15 Oct	Hawaiian Airlines
07 Oct - 14 Oct	Turkish Airlines
09 Oct - 16 Oct	Turkish Airlines
14 Oct - 21 Oct	Turkish Airlines
16 Oct - 23 Oct	Turkish Airlines
20 Oct - 27 Oct	Delta
23 Oct - 30 Oct	Turkish Airlines
30 Oct - 06 Nov	Turkish Airlines
27 Oct - 03 Nov	KLM
31 Oct - 07 Nov	Delta

Also check the deals for one-way flights from Seattle to Ljubljana in October.

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 Seattle to Ljubljana in October from $667

Return flights