The contributors of Flight-Report published 7 reviews on 3 airlines on the route London - Heathrow (LHR) → Chicago - Chicago O'Hare (ORD). The airline with the best average rating is British Airways with 7.3/10. The average flight time is 8 hours and 48 minutes.
Airlines on this route are:
Frequent travelers recommend "Cathay Pacific First/Business Class Lounge" at LHR for comfort and meals/catering.