Most travellers find the cheapest round-trip flights to Porto when choosing a flight departing in September.
In general, most flyers find the cheapest time to book a flight to Porto is about 44 days prior.
From most locations, the cheapest day to fly to Porto is Tuesday. Most users found that departing on a Friday was most expensive.
Generally, when visiting Porto, evening flights represent the best value. noon flights are likely to have higher prices.