The contributors of Flight-Report published 40 reviews on 2 airlines on the route Madrid - Adolfo Suarez (MAD) → London - Heathrow (LHR). The airline with the best average rating is British Airways with 7.3/10. The average flight time is 2 hours and 19 minutes.
Airlines on this route are:
Frequent travelers recommend "Neptuno" at MAD for comfort and meals/catering.
London has 1 other airport with flights arriving from Madrid : London - Gatwick (LGW)