This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $245 fare is the cheapest current round-trip from Porto (OPO) to PDL on S4 flight S4173, departing 2026-09-22 at 19:35 with return on 2026-09-29.

Clicking "Book this flight" opens Kiwi.com with this exact flight pre-filtered — same airline, same dates, same passenger count.