Are there nonstop flights from London (STN) to Reykjavík (KEF)?

Yes. Jet2.com fly this route. Flight time is about 2h 43m.

What is the fastest connection from London (STN) to Reykjavík (KEF)?

via Glasgow ≈ 3h 13m, via Edinburgh ≈ 3h 14m, via Belfast ≈ 3h 15m (estimated flying time, excluding layovers).

London Stansted Airport (STN) to Keflavik International Airport (KEF)・1,885 km

Nonstop flights available (1 airline). Flight time about 2h 43m. Nonstop return flights also operate.

31 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.