Check seat guru with your specific flight number or exact aircraft model.
Flew them from London to Houston and they had TV's and movies to watch.
I always take my iPad with my own games and movies.
Yes, they do have seat back tvs
Many thanks to everyone who replied with advice to my question x.
I noticed that you inadvertently posted your question in the Orlando Forum, so I have moved the topic on your behalf to the Air Travel Forum.
TripAdvisor Community Moderator
Yes all of the transatlantic fleet of 757, 767, and 777 have seat back TVs. Not sure if some of the 767-300 still have older style content on a constant loop compared to on-demand.
Check United's website for the available entertainment options, all the information is there.
Their flights between Europe and the US generally has seat back video on demand. Additionally personal device entertainment is available through United's app. Down load the app prior to the flight.