In general, when looking for the cheapest flight to Porto, try to choose a flight departing in October for the best deal.
In general, most flyers find the cheapest time to book a flight to Porto is about 60 days prior.
Most of our users find that booking their departure to Porto on a Monday is the cheapest. Conversely, departing on a Friday seems to be the most expensive.
In general, when looking for the cheapest flight to Porto, our data indicates that evening flights are the most cost-effective. morning flights tend to be the most expensive.