Jet lag from Copenhagen to Johannesburg
Flying from Copenhagen to Johannesburg is at most 1 hour east on the clock, depending on the date. Jetlag Away moves your body clock earlier, the harder direction, starting in the nights before you fly. For part of the year there is no shift at all.
A long flight with almost no time difference: in the European summer there is none at all. What you feel on arrival is travel fatigue, from a night in a seat, dry air and a long day, not jet lag. Your body clock is already on local time, or within an hour of it, so there is little or nothing to shift. A normal night's sleep in Johannesburg is what it needs.
The shift through 2027
The difference between the two clocks changes when either country changes its clocks, so the same flight is not the same trip all year. This is the shift for a departure at 22:00 Copenhagen time, measured at each end at the moment you are there, the way the app measures it.
| Departing | Shift | What the plan does |
|---|---|---|
| 1 January – 27 March | 1 hour east | Moves your clock earlier |
| 28 March – 30 October | No shift | Nothing to shift |
| 31 October – 31 December | 1 hour east | Moves your clock earlier |
How long it takes
The plan moves your sleep a little each night before you fly, then sets light, sleep and caffeine on local time until the shift is made. How much it does before departure, and how many days after landing carry light instructions, depend on the intensity you choose. These are the app's figures with its default limits: never woken before 05:00, never kept up after 01:30. They are a schedule, not a promise of how you will feel.
1 hour east
| Intensity | Before you fly | After landing |
|---|---|---|
| Gentle | 1 hour, 2 nights | Nothing left |
| Moderate | 1 hour, 2 nights | Nothing left |
| Aggressive | 1 hour, 2 nights | Nothing left |
An example plan in February
Leaving Copenhagen at 22:00 on 12 February 2027 and landing in Johannesburg at 10:00 on 13 February, local time. 1 hour east, so the plan moves your clock earlier. Built at the moderate intensity for someone who usually sleeps 23:30 to 07:00.
The nights before you fly
Copenhagen time.
- 2 nights before: bed 23:00, up 06:30 (30 minutes earlier)
- The night before: bed 22:30, up 06:00 (1 hour earlier)
The day you fly
Johannesburg time: from the day you fly, the plan runs on your destination's clock.
- No caffeine after 17:30
- Stay awake, 23:00–23:30
- Sleep, 23:30–07:00
- Stay awake, 07:00–10:00
After landing
Johannesburg time.
- Arrival, 13 February: No caffeine after 17:30; Sleep, 23:30–07:00
Read next
- When light helps and when it hurts: why the morning after an eastbound flight is the hour to be careful with.
- Why flying east is harder, and what that changes about the plan.
- How jet lag works, and how it differs from travel fatigue.
- Short trips: if you fly home within 3 days, the app keeps you on home time instead of adjusting.
- How a plan is built: the rates, the steps and the sources behind every number on this page.
- Jet lag by route: every route with a page like this one.
The figures on this page are computed by the same code the app runs, for 2027, from an example flight. Jetlag Away is a scheduling tool and not medical advice. If you have a sleep or circadian disorder, or any diagnosed condition affected by sleep, talk to a healthcare professional first — see the health disclaimer in our terms.
Last reviewed 10 October 2026. Published 10 October 2026.