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TAP Air Portugal is the national carrier and a Star Alliance member, with a large network to North America. Several major US airlines also serve Lisbon, and some serve Porto.
Fares to Portugal are typically lower from November to March, apart from the holidays. Spring and autumn are pleasant shoulder seasons, while summer is peak.
Lisbon (LIS) has the most international flights. Porto (OPO) is best for northern Portugal, and Faro (FAO) for the Algarve.
Winter outside the holidays usually offers the lowest fares. Summer is the busiest and often most expensive season.
They are roughly 300 km apart, and trains between them are frequent, typically taking about three hours.