Mulu National Park is accessible by air via direct flights from both Miri (daily) and Kota Kinabalu (thrice weekly).
For the standard Mulu Caves tours (either 2-day or 3-day), it is advisable for you to arrive at Mulu in the morning (latest just before midday) so that you have enough time to check in the hotel and unpack before starting your tour of 2 standard showcaves (usually Deer and Lang) on the first day, and another two more showcaves (Wind and Clearwater) on the next day.
For a 3D/2N or longer tour, if you can't make it to Mulu earlier, do ask the travel operator to fit in the visit to the 2 caves on day 3, that is, if your flight is after midday. But since Mulu is a real natural wonder, do make it a point to arrive early on day 1 and leave a bit later on the last day so that you can really enjoy Mulu to its fullest.
For the more challenging and adventurous excursions such as the Headhunters Trail or the Mt. Api Pinnacles, you need at least 4 to 5 days at Mulu National Park ad you may even contemplate an extra day or two to recuperate or simply just leisure around at one of the most breathtaking World Heritage Sites in this region.
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