We flew from London to Vietnam with Vietnam Airlines, which takes just shy of 12 hours. Thankfully we had a night flight, with a comfortable evening departure of 7pm.
Onboard the service was warm and friendly. We had a fantastic Thai green curry for dinner, which was delicious and spicy, and I was able to make a start on some of the movies on my to-watch list thanks to the in-flight entertainment. I also managed to get a good chunk of sleep before we landed in Hanoi, and from here we took an internal flight to Siem Reap.
Transferring between the flights was a breeze and we made the most of lounge access while we waited; I would highly recommend the massage chairs in the Vietnam Airlines Lotus Lounge in Hanoi!
For our return we flew Premium Economy, which gave us extra space and legroom, allowing you to sleep comfortably.