Certain of BA’s longer European routes earn an enhanced level of Tier Points – 80 instead of the normal 40 for shorter segments. Destinations include Athens, Bucharest, Helsinki, and Instanbul. Also included is Sofia in Bulgaria. Whilst there are significant restrictions in visiting at the moment – a PCR test within 48 hours of arrival is needed – it can be done!
There are fewer flights to Sofia than pre-pandemic but now is the time to book if you want to visit as BA has some good ex-London fares. The weekend I needed was £223 but other weekends were cheaper. I found around £215 earlier in the year.
Of course, as a by-product if you need a longer mileage run then Sofia is a great starting point to the USA. This example from August nets 80+140+140+140+140+80 = 720 Tier Points for around £1050. (Plus any earned from positioning flights)
BA’s web site is showing good availability for most of the year: