The cheapest Porto to Sal return flight on the radar right now is €205, flying with TAP Air Portugal non-stop. It covers departures in September 2027, and every dated link below opens that exact OPO–SID search on Skyscanner. The price we usually record on this route is €219. Across 114 recorded checks it has ranged between €182 and €891. Our sampling points to September 2027 as the cheapest month to fly Porto to Sal.
Prices are re-checked against Skyscanner automatically, and every one shows when it was last confirmed, so nothing here is older than it looks. Not flying from Porto? We track 57 other departure cities for Sal, listed at the foot of this page.
Prices like this tend to vanish fast. If it has gone when you look, try the days either side of the dates above, since Porto to Sal is often still worth booking within a day or two of the fare we found.