Gov.UK Foreign Travel Advice:
From 26 July, the FCO advises against all non-essential travel to mainland Spain based on the current assessment of COVID-19 risks. Only the Canary Islands (Tenerife, Fuerteventura, Gran Canaria, Lanzarote, La Palma, La Gomera, El Hierro and La Graciosa) and Balearic Islands (Mallorca, Menorca, Ibiza, and Formentera) are exempt from the FCO advice against all non-essential international travel.
This advice is based on evidence of increases in cases of COVID-19 in several regions, but particularly in Aragon, Navarra and Catalonia (which include the cities of Zaragoza, Pamplona and Barcelona).
The FCO is not advising those already travelling in Spain to leave at this time. Travellers should follow the advice of the local authorities on how best to protect themselves and others, including any measures that they bring in to control the virus. If you are returning from Spain (including from the Balearics and Canaries) on or after 26 July you will be required to quarantine on your return to the UK, but the FCO is not advising you to cut short your visit. You should contact your tour operator or airline if you have any questions about your return journey.