Are there nonstop flights from Grenoble (GNB) to London (LHR)?

No. The fastest connection is via Saint Peter Port, about 2h 12m of total flying time.

What is the fastest connection from Grenoble (GNB) to London (LHR)?

via Saint Peter Port ≈ 2h 12m, via Manchester ≈ 2h 31m, via Newcastle upon Tyne ≈ 2h 53m (estimated flying time, excluding layovers).

Grenoble Alpes Isère Airport (GNB) to London Heathrow Airport (LHR)・802 km

No nonstop flights. The fastest connection is via Saint Peter Port (GCI), about 2h 12m of flying time (layover not included).

None.

5 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.