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

Return flights

15 Oct - 23 Oct	Ryanair	direct
15 Oct - 19 Oct	Ryanair	direct
09 Oct - 23 Oct	Ryanair	direct
08 Oct - 23 Oct	Ryanair	direct
09 Oct - 19 Oct	Ryanair	direct
08 Oct - 19 Oct	Ryanair	direct
15 Oct - 16 Oct	Ryanair	direct
02 Oct - 05 Oct	Ryanair	direct
02 Oct - 23 Oct	Ryanair	direct
09 Oct - 16 Oct	Ryanair	direct

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 78€

Return flights