🇰🇷 Seoul → 🇬🇧 London

The flight from Seoul (ICN) to London (LHR) covers approximately 8,861 kilometers (5,506 miles) based on the great-circle distance between both airports. This is the shortest theoretical path over Earth's surface, though actual flight paths may be slightly longer due to air traffic routing, weather avoidance, and airspace restrictions.

The estimated non-stop flight time is 10h 45m to 12h 8m, assuming a modern jet cruising at approximately 850 km/h. This gate-to-gate estimate includes time for taxi, takeoff, climb, cruise, descent, and landing. Actual duration varies based on wind conditions — particularly the jet stream — aircraft type, and airport congestion at both ends.

London is 8 hour(s) behind Seoul. Travelers crossing 8 time zone(s) westward can expect severe jet lag, with full circadian adjustment typically taking about 6 day(s).

Since you're traveling westward, your body clock needs to delay — meaning you'll feel alert later into the evening and sluggish in the morning. Evening light exposure at your destination helps push your clock in the right direction.