The contributors of Flight-Report published 7 reviews on 3 airlines on the route Bangkok - Suvarnabhumi (BKK) → London - Heathrow (LHR). The airline with the best average rating is Thai Airways with 8.1/10. The average flight time is 12 hours and 32 minutes.
Airlines on this route are:
Frequent travelers recommend "Thai Airways Royal First Class Lounge" at BKK for services and comfort.