Bella Thorne and Gregg Sulkin arrived safe and sound at London's Heathrow airport after a very bad start ... when their plane crashed into a fence at JFK.
The wing of their Virgin Atlantic jet struck a blast fence Saturday, and they were 12 hours delayed.
The belatedly arrived -- 12 hours later -- on Delta. No pics of Bella Hadid, who was also on the Virgin flight.
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