According to Skyscanner Faro (Algarve) is the number one among the top 10 international destinations for economy class searched by UK travellers for summer (June – August) 2021.

"We’re seeing positive growth in searches and bookings for travel this summer. Volumes from the UK are trending upwards, with 12% growth in searches and 7% growth in bookings over the past week. July 2021 is currently the most searched month for flights for UK travellers. Pent-up demand will only increase in 2021 as the world re-opens. For example, bookings for Portugal spiked by over 2,000% on Skyscanner immediately following the quarantine exemption announcement last year."

https://www.partners.skyscanner.net/news-case-studies/summer-travel-demand