Fly into Lisbon (LIS-Humberto Delgado), the closest airport, located 7.2 mi (11.6 km) from the city centre. If you're unable to find a flight that fits your schedule, you could also fly into Cascais (CAT), which is 18.2 mi (29.2 km) away.
If you'd prefer to travel by train, the main station serving the city is Póvoa Station.