AirHint found the following cheapest return flights from Seattle (SEA) to Ljubljana (LJU) in April 2026 (see full year).

Return flights

14 Apr - 21 Apr	Delta
21 Apr - 28 Apr	Delta
22 Apr - 29 Apr	Delta
28 Apr - 05 May	Delta
15 Apr - 22 Apr	Turkish Airlines
16 Apr - 23 Apr	Turkish Airlines
23 Apr - 30 Apr	Turkish Airlines
30 Apr - 07 May	Turkish Airlines
29 Apr - 06 May	Delta
27 Apr - 04 May	Turkish Airlines
20 Apr - 27 Apr	Turkish Airlines
19 Apr - 26 Apr	Delta
26 Apr - 03 May	Delta
18 Apr - 25 Apr	Turkish Airlines
17 Apr - 24 Apr	Delta
24 Apr - 01 May	Turkish Airlines
25 Apr - 02 May	KLM

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

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 April from $709

Return flights