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Flying westbound from London to New York involves a 5-hour timezone shift, rated "4" in difficulty. Expect around 3.8 days for full recovery. Below you will find departure timing tips, a day-by-day recovery plan, and seasonal advice.
LHR to JFK
Airlines on this route: American (AA)
Scheduled flights from London to New York with estimated jetlag recovery timelines. Departure time significantly affects recovery — earlier or later flights can mean days of difference.
Jetlag from London (LHR) to New York (JFK) is rated "4" with a 5-hour timezone shift traveling westbound. Conservative recovery estimate is 3.8 days.
For westbound travel from London to New York, daytime flights arriving in the evening tend to minimize jetlag impact.
Recovery from London to New York jetlag typically takes 3.8 days with a conservative approach or 2.8 days with an aggressive light therapy and melatonin strategy. The 5-hour westbound shift is generally easier because your body delays its clock.
Eastbound travel is generally harder for jetlag recovery because it requires advancing your circadian clock, which the body resists. Westbound travel involves delaying your clock, which is more natural. For every hour of timezone shift, eastbound recovery takes about 1.5 days vs 1 day for westbound.