The nearest airport is in Humberto Delgado Airport (LIS), located 5.9 mi (9.4 km) from the city center. If you're unable to find a flight that fits your schedule, you could book a flight to Cascais (CAT), which is 11.3 mi (18.2 km) away.
It's easy to get around Cacilhas by jumping on the metro at 25 de Abril Station, Cacilhas Station or Gil Vicente Station.