Getting a driver in Portugal requires some planning. While you can get a taxi or uber on each city, for very short distances, the challenge comes up when you are visiting multiple cities and want someone trustable, reliable, and with a comfortable and modern vehicle that can take you safely between cities, for one transfer or multi-transfers.
Additionally, although most drivers can understand and speak some basic English, to get an English Speaking fluent driver and the same knowledgeable can be a hard task.
When not booking in advance, you end up getting a random driver on the street. That might not be the best choice, if you need long-distance transfers, around Portugal, outside Lisbon area.
Check here for online quotation and reservation (transfers between cities, car + driver hourly, etc): https://lisbonguide.org/private-transfers-portugal/
Some options to consider:
1) Concierge Portugal – TRANSPORTATION AND TOURS – https://lisbonguide.org/private-transfers-portugal/
If you are looking for private transfers, and driver services in Portugal (hourly, one day, multi-day), check here this option, directly available at The Lisbon Guide, from Concierge Portugal. Instant reservation and modern fleet of Mercedes-Benz Vehicles (Sedan, Minivan, Minibus).
2) Lisbon Private Tours – http://lisbonprivatetours.com/
Here you will be able to hire a driver for one day or several days, while in Portugal. Disposal service with driver and vehicle, Mercedes-Benz fleet (Mercedes-Benz Fleet E-Class and V-Class). Cover all regions of Portugal (Lisbon, Porto, Algarve, Fatima, Douro Valley, and much more)
3) Portugal Magik Private Tours – http://portugal-magik.com/ (Multi-Day Tours across Portugal)
Here, you will be able to find milti-day tours, for several days aceoss Portugal, including private transportation and english speaking guides. Cover the major cities around Lisbon (Sintra, Fatima, Evora) and also Algarve and northern Portugal (Coimbra, Porto, Douro Valley, Braga, and also Spain as well). All staff are fluent in English.
4) CONCIERGE PORTUGAL / LISBONGUIDE
For direct transfers across Portugal, with online instant quotation, online booking and instant confirmation