Are there nonstop flights from London (LHR) to Guadalajara (GDL)?

No. The fastest connection is via Houston, about 11h 41m of total flying time.

What is the fastest connection from London (LHR) to Guadalajara (GDL)?

via Houston ≈ 11h 41m, via Nashville ≈ 11h 41m, via Toronto ≈ 11h 42m (estimated flying time, excluding layovers).

from 27,500 ANA miles, from 37,000 JAL miles (economy, one way, based on the published award charts).

London Heathrow Airport (LHR) to Guadalajara International Airport (GDL)・9,084 km

No nonstop flights. The fastest connection is via Houston (IAH), about 11h 41m of flying time (layover not included).

With milesANA 27,500 miles+ (via IAH)JAL 37,000 miles+ (via DFW)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

28 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.