AirHint found the following cheapest return flights from Porto (OPO) to Shannon (SNN) in October 2025 (see full year).

Return flights

02 Oct - 12 Oct	Ryanair	direct
01 Oct - 09 Oct	Ryanair	direct
15 Oct - 22 Oct	Ryanair	direct
22 Oct - 30 Oct	Ryanair	direct
16 Oct - 19 Oct	Ryanair	direct
02 Oct - 05 Oct	Ryanair	direct
09 Oct - 16 Oct	Ryanair	direct
09 Oct - 12 Oct	Ryanair	direct
15 Oct - 28 Oct	Ryanair	direct
05 Oct - 08 Oct	Ryanair	direct
30 Oct - 02 Nov	Ryanair
31 Oct - 03 Nov	Ryanair

Also check the deals for one-way flights from Porto to Shannon 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 Porto to Shannon in October from 60€

Return flights