The awards are decided by an algorithm that reviews the quantity and quality of airline reviews submitted by travellers over the last year.
It is the first time TripAdvisor has run the awards for airlines having launched sector reviews in July 2016.
Jet2.com scored particularly strongly for customer service, cleanliness, value for money, check-in, boarding, and its 22kg baggage allowance.
Steve Heapy, chief executive of Jet2.com and Jet2holidays said: “We are thrilled and proud to be named by TripAdvisor as both the best UK airline and the best low-cost airline across all of Europe.
“What makes the accolades so special is the fact that they are based on the experiences and feedback of customers, making the recognition even more rewarding.”
