The winners were determined using an algorithm which analyses the millions of reviews and ratings for hotels, restaurants and attractions.
And this year, London secured the first place position in the TripAdvisor Travellers’ Choice Awards.
Paris took second spot this year, with Rome rolling in at third place and Crete in fourth.
Despite being a long-time favourite with travellers worldwide, New York slipped out of the top 10.
“The global fascination with Harry and Meghan clearly has a powerful effect”
Hayley Coleman
London came second in 2018 and TripAdvisor says that its move into the top spot might be connected to the Royal Wedding last year.
Hayley Coleman, a spokesperson for TripAdvisor, said: “The global fascination with Harry and Meghan clearly has a powerful effect as this is the first time since 2016 that London has topped the world rankings.
“With the couple’s new baby due imminently, London may continue to reap the rewards of the Harry and Meghan effect into 2020.”
Also proving popular is Bali, in fifth place, and the Thai resort of Phuket in sixth.
TripAdvisor’s top-rated holiday destinations for 2019 revealed:
1. London
2. Paris
3. Rome
4. Crete
5. Bali
6. Phuket
7. Barcelona
8. Istanbul
9. Marrakech
10. Dubai
11. Prague
12. Siem Reap
13. New York City
14. Jamaica
15. Hanoi
16. Tokyo
17. Playa del Carmen
18. Lisbon
19. Kathmandu
20. Jaipur
21. Hurghada
22. Hong Kong
23. Cusco
24. Sydney
25. Tel Aviv
In the UK table, the north beat the south with six winning destinations.
Edinburgh, Liverpool, Glasgow, Belfast, York and Manchester takes second, third, fourth, fifth, eighth and ninth place.
While in the south, London, Bath, the Isle of Wight and Jersey came in first, sixth, seventh and tenth position.
Laura Citron, CEO of Visit London, said: “We are delighted to see London top the list of TripAdvisor’s Global Traveller’s Choice awards.
“London has an exciting history as a centre for creativity and free thinking, from Shakespeare to the birth of punk and the catwalks of today.
“This creative energy and cultural vibrancy can be felt in every aspect of London life: food, fashion, arts, exhibitions, shops, and nightlife.”