Getting thereNearest airport: Zurich (ZRH), about 1 h 15 by car. Drive the A2/A4 to the Seedorf/Altdorf area, then take the lakeside road round the south end of the lake through Flüelen towards the Isleten valley — avoid the motorway for the final approach. By public transport: train to Altdorf or Flüelen, then bus to Seedorf/Isleten, or a lake boat directly to the Isleten landing stage. Park in the paid car park at the Seegarten Isleten restaurant (fills fast on good Föhn days), then it's a short walk to the delta. Day visitors need a CHF 15 day lycra from the Beachhouse Isleten (verify current price) or Kite Uri club membership (CHF 60/year); day-guest numbers are limited, and club members are generally on hand to help with launching and landing.
HazardsExperienced riders only — Kite Uri representatives can and do refuse launches for adverse conditions or insufficient skill. Föhn is extremely gusty and can run well above forecast, with severe turbulence and wind shadow close to the cliffs. A 150 m inshore zone is off-limits: launch and land by the shortest possible line, and give way to the passenger ferries, which have priority and pause kite traffic on arrival/departure. The delta itself is tiny with very limited landing space — keep kites off the peninsula and pack up immediately, no lingering or practising on land. As the thermal fades in the evening, a 1–2 Bft katabatic bergwind builds down the Isletenthal valley, which can make it hard to get back to the delta if you stay out too late. Water is cold, deep close to shore, and there's no shallow standing area.
Best time of dayThermal days: the NW builds above Sisikon around 11:00–14:00 and reaches Isleten a bit later, generally peaking 15:00–16:00; realistically plan a session from roughly 14:00–17:00, since the thermal dies at the delta before it does further south at Gruonbach (where it can hold until 20:00). Föhn days aren't tied to the clock — check for a Föhn warning and watch for a "Föhnbise" (a northerly flow that precedes it; the stronger it is, the stronger the Föhn that follows) as your best early signal. Avoid late-evening sessions because of the downslope bergwind and fading light. For forecasting, look for 4–8 knots NW–NE at 14:00 for thermal potential — it can work even when the model shows 0–2 knots), also check 10 m ground-level maps useful for judging whether a Föhn will actually break through to lake level.