The cheapest Porto to Agadir return flight on the radar right now is €138, flying with Royal Air Maroc via one or more connections. It covers departures in December 2026, and every dated link below opens that exact OPO–AGA search on Skyscanner. At 61% under the €351 we normally record here, it is one of the strongest OPO–AGA fares in our index. Across 59 recorded checks it has ranged between €97 and €425. Our sampling points to December 2026 as the cheapest month to fly Porto to Agadir.
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 38 other departure cities for Agadir, 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 Agadir is often still worth booking within a day or two of the fare we found.