This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $277 fare is the cheapest current round-trip from Porto (OPO) to PDL on S4 flight S4183, departing 2026-07-16 at 15:40 with return on 2026-07-20.

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