How Long Does Jet Lag Last?

Quick Answer

Jet lag usually lasts about one day per time zone crossed, so most travelers recover in 3 to 7 days. Flying east (losing hours) is generally harder than flying west, because it's easier for the body to stay up later than to fall asleep earlier. Crossing just one or two time zones may cause only mild, brief symptoms, while a trip across 8+ zones can take a week or more to fully adjust.

Recovery Time by Direction and Distance

Trip	Time Zones Crossed	Typical Recovery
Short east-west (e.g., US coast to coast)	3	2–3 days
Westward long-haul (e.g., London to New York)	5	3–5 days
Eastward long-haul (e.g., New York to London)	5	4–6 days
Very long eastward (e.g., US to East Asia)	8+	6–9+ days
North-south (same time zone)	0	Minimal jet lag

Common Jet Lag Symptoms

• Fatigue and daytime sleepiness
• Trouble falling or staying asleep at night
• Difficulty concentrating
• Irritability or low mood
• Digestive problems (upset stomach, constipation)
• General feeling of being unwell

Why Jet Lag Happens

Your body runs on an internal 24-hour clock (the circadian rhythm) synced to light and dark. Rapid travel across time zones puts that clock out of step with the local day-night cycle. Until your internal clock resets — which it does slowly, at roughly one time zone per day — your body wants to sleep, eat, and wake on your origin schedule. Eastward travel is tougher because it shortens your day.

Factors That Affect How Long Jet Lag Lasts

• Number of time zones: More zones means longer recovery.
• Direction: Eastward travel is harder than westward.
• Age: Older travelers often adjust more slowly.
• Individual chronotype: Night owls and early birds adapt differently.
• Sleep before travel: Starting sleep-deprived worsens symptoms.
• Light exposure: Getting the right light at the right time speeds adjustment.

How to Get Over Jet Lag Faster

• Shift your schedule a few days before departure — go to bed earlier when flying east, later when flying west.
• Get sunlight at the destination; morning light helps after eastward flights, evening light after westward.
• Adopt local time immediately for meals and sleep upon arrival.
• Stay hydrated and limit alcohol and caffeine on the flight.
• Take short naps (20–30 minutes) if needed, but avoid long daytime sleep.
• Consider melatonin in the evening at your destination — talk to a doctor first.

When to See a Doctor

Jet lag is temporary and resolves on its own. Consult a doctor if symptoms persist beyond a week or two, if you're a frequent long-haul traveler struggling with recurring sleep problems, or before using melatonin or sleep aids — especially if you have a medical condition or take other medications. Seek prompt care for symptoms that go beyond jet lag, such as chest pain, leg swelling, or shortness of breath after a long flight, which can signal a blood clot.