AirHint found the following cheapest return flights from Kaunas (KUN) to Shannon (SNN) in September 2025 (see full year).

Return flights

27 Sep - 04 Oct	Ryanair	direct
11 Sep - 15 Sep	Ryanair	direct
20 Sep - 22 Sep	Ryanair	direct
25 Sep - 29 Sep	Ryanair	direct
18 Sep - 22 Sep	Ryanair	direct
04 Sep - 08 Sep	Ryanair	direct
08 Sep - 11 Sep	Ryanair	direct
06 Sep - 08 Sep	Ryanair	direct
07 Sep - 08 Sep	Ryanair
07 Sep - 10 Sep	Ryanair

Also check the deals for one-way flights from Kaunas to Shannon 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 Kaunas to Shannon in September from $54

Return flights