The contributors of Flight-Report published 11 reviews on 1 airlines on the route London - Heathrow (LHR) → Helsinki - Helsinki-Vantaa (HEL). The airline with the best average rating is Finnair with 7.3/10. The average flight time is 2 hours and 37 minutes.
Airlines on this route are:
Frequent travelers recommend "Cathay Pacific First/Business Class Lounge" at LHR for comfort and meals/catering.
London has an another airport to go to Helsinki : London - Gatwick (LGW)