Are there nonstop flights from London (LGW) to Denver (DEN)?

No. The fastest connection is via Reykjavík, about 10h 1m of total flying time.

What is the fastest connection from London (LGW) to Denver (DEN)?

via Reykjavík ≈ 10h 1m, via Montréal ≈ 10h 13m, via Toronto ≈ 10h 14m (estimated flying time, excluding layovers).

from 27,500 ANA miles (economy, one way, based on the published award charts).

London Gatwick Airport (LGW) to Denver International Airport (DEN)・7,533 km

No nonstop flights. The fastest connection is via Reykjavík (KEF), about 10h 1m of flying time (layover not included).

With milesANA 27,500 miles+ (via IST)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

14 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.