Where are Heathrow, Gatwick and Stansted in world's worst airport rankings?

Four British airports are among the worst 10 in the world, according to new rankings measuring punctuality, quality and service.

Gatwick, Stansted and Manchester were in the bottom five, while Edinburgh was the sixth worst-rated by AirHelp.

Worst 10 airports by ranking

:: Kuwait 5.02
:: London Gatwick 5.38
:: Manchester 5.43
:: Newark Liberty, New Jersey, USA 5.92
:: Stansted 6.07
:: Edinburgh 6.10
:: Mumbai, India 6.21
:: Dubai, UAE 6.24
:: Bangkok Suvarnabhumi, Thailand 6.30
:: Delhi, India 6.31

Heathrow was the only British airport to fly high as the 20th best airport. It fell between San Francisco and Vancouver.

Top 10 airports by ranking

:: Singapore Changi 9.07
:: Munich, Germany 8.66
:: Hong Kong 8.42
:: Copenhagen Kastrup, Denmark 8.04
:: Helsinki-Vantaa, Finland 8.03
:: Cincinnati-Northern Kentucky, USA 7.94
:: Barcelona El Prat, Spain 7.90
:: Madrid Adolfo Suarez-Barajas, Spain 7.81
:: Auckland, New Zealand 7.80
:: Frankfurt, Germany 7.76

Image:Singapore's Changi Airport clinched the top spot

Airlines were also ranked, with British Airways placed seventh worldwide out of 87 carriers, followed by Virgin Atlantic.

Ryanair and Monarch featured in the bottom five based on on-time performance, quality of service and how well airlines process claims for compensation.

Singapore soared above the competition again, its national carrier Singapore Airlines ranked the top carrier in the world.