Across the river from Lisbon — affordable living with fast ferry connections to the city centre.

Fernão Ferro, Seixal
Yes — Seixal has a range of private schools alongside IPSS (subsidised) nurseries and kindergartens. Bilingual options are more limited than in Lisbon or Cascais, but the area is growing rapidly and new schools have opened in recent years.
The Transtejo ferry from Seixal to Lisbon's Cais do Sodré takes around 25 minutes and is one of the most scenic commutes in Europe. Alternatively, the A2 motorway via the Ponte 25 de Abril takes 20–40 minutes by car depending on traffic.
Significantly — housing costs in Seixal are typically 30–40% lower than equivalent properties in Lisbon. School fees at private schools are also generally lower than in Cascais or central Lisbon, making Seixal popular with families on tighter budgets.
Charneca da Caparica is a parish within the Almada municipality (just west of Seixal) popular with families for its quieter residential feel, proximity to the Costa da Caparica beaches, and lower housing costs. Schools in the area are listed under Almada on Skolvi.
Weekly school digest