Quick Travel Tools
Data study · Updated 2026-07-30

The Best & Worst Jet-Lag Routes, 2026

Jet lag isn't just about distance. It's about direction. We modelled recovery between 27 major cities. Flying east averages ~2.4 days to feel normal; flying west, only ~1.7. Here are the routes that hit hardest.

Los Angeles → Dubai one of the worst routes, at about 5 days to adjust
2.4 vs 1.7 average days to recover: eastbound runs about 41% longer than westbound
~24.2h the body clock's natural day, which is why delaying (west) beats advancing (east)
Average days to feel normal, by direction of travel

Flying east costs you more

Same time difference, opposite directions. Eastbound recovery runs about 41% longer than the westbound leg.

Eastbound
2.4 days
Westbound
1.7 days

Averaged across all city pairs. Model: ~1 day of adjustment per 2.5 time zones eastward, per 3.5 zones westward, effective shift capped at 12 hours.

Longest recovery of every city pair we modelled

The 12 toughest long-hauls

Every one is an eastbound trip near the 12-hour maximum shift, so they all cluster around the ~5-day mark, the longest recovery in the set.

  1. Los Angeles → Dubai ~5d east
  2. New York → Bangkok ~5d east
  3. Toronto → Bangkok ~5d east
  4. São Paulo → Tokyo ~5d east
  5. São Paulo → Seoul ~5d east
  6. Buenos Aires → Tokyo ~5d east
  7. Buenos Aires → Seoul ~5d east
  8. London → Auckland ~5d east
  9. Chicago → Mumbai ~5d east
  10. Mexico City → Mumbai ~5d east
  11. Los Angeles → Moscow ~4d east
  12. Los Angeles → Istanbul ~4d east

Your internal clock naturally runs slightly longer than 24 hours, so it prefers to delay, which is what flying west asks of it. Flying east forces it to advance, which it resists. That's why a New York to Asia trip can leave you off for several days while the return leg fades faster, even though the distance is identical. The practical upshot: plan the least recovery time for eastbound legs, and use morning light heading east, evening light heading west, to speed things along.

Estimate your own route →

Methodology & source

Recovery estimated with a common sleep-science rule of thumb for functional recovery ("feeling back to normal"): roughly a day of adjustment for every 2.5 time zones eastbound (harder) and every 3.5 zones westbound (easier). Time shifts over 12 hours re-entrain the shorter way around the clock, so nothing exceeds a 12-hour effective shift (about 5 days at most). Standard-time offsets used for 27 cities. A guide, not medical advice.

Data: IANA time-zone offsets (standard time) + Quick Travel Tools model (public data). Analysis by Quick Travel Tools.

Cite this study (free with a link back):
Quick Travel Tools: “The Best & Worst Jet-Lag Routes, 2026”. https://quicktraveltools.com/studies/worst-jet-lag-routes-2026/