Istanbul to London Gatwick is operated by Turkish Airlines, complementing its higher-frequency IST-LHR service. Distance is roughly 2,560 km (1,590 miles), with westbound flight time around 4 hours and eastbound around 3 hours 45 minutes.
Why use IST-LGW vs. IST-LHR
LGW often has significantly cheaper fares, particularly off-peak. If your London destination is south of central London (Brighton, Surrey, etc.) Gatwick is more convenient than Heathrow. For onward connections, Heathrow has a much deeper network — the LHR option is usually better if you're connecting beyond London.
Connection notes
Turkish Airlines' Star Alliance partnerships at IST mean efficient onward routing to Asia, Africa, and the Middle East. The IST experience is generally smooth, with Turkish Airlines lounges at IST particularly well-regarded for premium-cabin passengers.