Flying VFR into Portugal is easy and free.
All you need is a flight plan and some more items.
Intra-community (EU, EEA and Switzerland) flights, excluding non-Schengen flights, inbound or outbound of aerodromes and ultralight runways, are not subject to authorization.
The entry points in Lisboa FIR are described in the following chart in Portugal AIP:
https://ais.nav.pt/wp-content/uploads/AIS_Files/eAIP_Current/eAIP_Online/eAIP/html/index.html
Click ENR 6 – En-route Charts
The use of an 8.33 kHz Radio and a Transponder Mode C are mandatory.
ATC language: EN or PT only!
Free use of ULM airfields listed in VFR Manual. Observe PPR rules, if indicated.
https://ais.nav.pt/wp-content/uploads/AIS_Files/eVFR_Current/eVFR_Online/eAIP/html/index.html
Click Part 3, AD2 for aerodromes or AD4 for ULM airfields
In Portugal, ULM can fly into controlled airspace C class with a flight plan and use the general aviation aerodromes opened to ULM flights (see VFR Manual). Use of aerodromes Class IV, international airports, is not available.
Mandatory documents:
Valid ULM flight certificate or equivalent;
Valid Pilot license;
Insurance valid in PT;
Period of stay: max 90 days. For longer stays, a license from PT CAA “ANAC” is needed.
Remember: to fly ULM in Spain you will need a permit, please see: