Cheapest return flights from Seattle to Ljubljana in September from $664

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

Return flights

03 Sep - 10 Sep Turkish Airlines
04 Sep - 11 Sep Turkish Airlines
09 Sep - 16 Sep Turkish Airlines
02 Sep - 09 Sep Turkish Airlines
01 Sep - 08 Sep Turkish Airlines
12 Sep - 19 Sep Turkish Airlines
24 Sep - 01 Oct Delta
23 Sep - 30 Sep KLM
30 Sep - 07 Oct KLM
18 Sep - 27 Sep Turkish Airlines
29 Sep - 06 Oct jetBlue
18 Sep - 25 Sep British Airways
17 Sep - 24 Sep Turkish Airlines
25 Sep - 02 Oct Turkish Airlines

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

Skyscanner

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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