Cheapest return flights from Shannon to Porto in September from $96

Best time to book flights for Shannon (SNN) to Porto (OPO) flights at AirHint

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

Return flights

17 Sep - 25 Sep Ryanair direct
28 Sep - 09 Oct Ryanair direct
28 Sep - 15 Oct Ryanair direct
17 Sep - 18 Sep Ryanair direct
14 Sep - 18 Sep Ryanair direct
18 Sep - 25 Sep Ryanair direct
10 Sep - 18 Sep Ryanair direct
21 Sep - 25 Sep Ryanair direct
21 Sep - 09 Oct Ryanair direct
04 Sep - 18 Sep Ryanair direct
10 Sep - 17 Sep Ryanair direct
11 Sep - 25 Sep Ryanair direct
17 Sep - 24 Sep Ryanair direct
28 Sep - 12 Oct Ryanair direct
25 Sep - 09 Oct Ryanair direct
28 Sep - 05 Oct Ryanair
25 Sep - 15 Oct Ryanair direct
28 Sep - 05 Oct Ryanair direct
17 Sep - 05 Oct Ryanair direct
18 Sep - 05 Oct Ryanair direct

Also check the deals for one-way flights from Shannon to Porto 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.

Book a cheap hotel in Porto

Cheap car rent in Porto