Jet lag by route

What Jetlag Away does with a particular flight: how the time difference changes through 2027, which way the plan moves your body clock, and a worked example, day by day. Every figure is computed by the same code the app runs.

• New York to London →

  4 to 5 hours east. The plan moves your clock earlier.

• London to New York →

  4 to 5 hours west. The plan moves your clock later.

• London to Tokyo →

  8 to 9 hours east. The plan moves your clock earlier.

• Tokyo to London →

  8 to 9 hours west. The plan moves your clock later.

• London to Sydney →

  9 to 11 hours east. The plan moves your clock earlier or the long way round, depending on the season.

• Sydney to London →

  9 to 11 hours west. The plan moves your clock later.

• Los Angeles to Sydney →

  5 to 7 hours west. The plan moves your clock later.

• Sydney to Los Angeles →

  5 to 7 hours east. The plan moves your clock earlier.

• London to Los Angeles →

  7 to 8 hours west. The plan moves your clock later.

• New York to Tokyo →

  10 to 11 hours west. The plan moves your clock later.

• London to Dubai →

  3 to 4 hours east. The plan moves your clock earlier.

• Copenhagen to Johannesburg →

  At most 1 hour east. The plan moves your clock earlier.

A route that is not here works the same way in the app. How a plan is built explains the calculation, and the guides explain why.