**A private speedboat from Serangan to Nusa Lembongan typically takes about 30 to 45 minutes across the Badung Strait, depending on vessel size, sea state and departure time. Cabin day-cruisers run slightly longer. Book a morning slot around 08:00 to 08:30, when the strait is usually calmest and crossings are quickest.**
That is the short answer. The longer one depends on which boat you charter, when you leave, and how the wind sits on the Badung Strait that morning. Here is how the Serangan run actually works.
How long is the Serangan to Nusa Lembongan crossing?
Serangan (Turtle Island) sits on Bali’s south-east coast, roughly level with Sanur and a short hop closer to the Nusa islands than Benoa. Bali day-boat operators publish crossing times of about 30 to 45 minutes for the comparable Sanur-to-Nusa-Penida run on a private speedboat, and Nusa Lembongan sits just northwest of Penida, so the Serangan-to-Lembongan leg lands in the same window.
A light 12-metre speedboat with twin outboards will usually make it at the low end of that range. A heavier cabin day-cruiser or semi-yacht, built for comfort rather than raw speed, trades a few minutes for a smoother, drier ride.
| Route (private speedboat) | Approx crossing time | Notes |
|---|---|---|
| Serangan → Nusa Lembongan | ~30-45 min | Direct, no shared stops |
| Serangan → Nusa Penida (Toyapakeh) | ~35-50 min | Slightly further east |
| Lembongan ↔ Penida island-hop | ~10-15 min | Short internal channel hop |
Booking a private boat from Serangan means you skip the shared fast-boat queue and cross on your own schedule, so the clock starts when your group is ready, not when a 40-seat transfer fills up.
What affects your crossing time?
Four things move the needle, and none of them are a fixed timetable.
- Vessel type. A stripped-back speedboat is quickest; a cabin cruiser with air-con and a sun deck is a touch slower but far more comfortable for kids and grandparents.
- Sea state. A calm morning glass-off lets a skipper hold full cruising speed. Afternoon chop forces a slower, safer throttle.
- Load. A boat rated for 12 to 15 guests running near capacity sits deeper and loses a little speed versus a half-full charter.
- Exact drop point. Landing at Lembongan’s main beach differs by a few minutes from a mangrove or Yellow Bridge approach on the Lembongan-Ceningan channel.
| Vessel type | Ride feel | Est. Serangan-Lembongan time |
|---|---|---|
| 12m open speedboat | Fast, breezy, direct | ~30-40 min |
| 13m semi-yacht / cabin cruiser | A/C cabin, stable, dry | ~40-45 min |
| Larger day-cruiser (near capacity) | Slower, roomy, family-friendly | ~45-55 min |
Operators like Sanur Water Activities list a 12-metre speedboat from IDR 8,000,000 and a 13-metre semi-yacht (air-con cabin, karaoke, flat TV) from IDR 9,000,000 per boat as of 2026 — a useful gauge for the two speed profiles above.
When should you leave Serangan?
Earlier is almost always better. The Badung Strait tends to be calmest in the first hours after sunrise, then builds a light chop as the day’s wind fills in. Published sample itineraries from Bali operators reflect this: Sanur Water Activities’ example Penida day runs a 07:00 hotel pickup, an 08:00 counter briefing and sailing by 08:30 — early enough to hit the strait while it is still smooth.
| Departure window | Typical sea state | Best for |
|---|---|---|
| 07:30-09:00 | Usually calmest, quickest crossing | Families, seasickness-prone guests |
| 10:00-12:00 | Light chop building | Flexible late starts |
| 13:00 onward | Wind and swell often up | Shorter afternoon or sunset runs |
Sea conditions vary day to day, and no honest operator can promise flat water or a guaranteed manta sighting. This is a general seasonal pattern, not a schedule. If someone in your group gets seasick easily, lock in the earliest slot and pick the cabin cruiser over the open speedboat.
What does a private Serangan day actually look like?
Because you have the whole boat, the route bends to your group rather than a fixed loop. A common Lembongan-anchored day threads together:
- Nusa Lembongan — the Yellow Bridge, the mangrove channel and the calm bays for a first swim.
- A short hop to Nusa Penida — Manta Point / Manta Bay for snorkelling with manta rays, then Crystal Bay or Toyapakeh for clear-water reef.
- Land add-ons on Penida — Kelingking Beach, Broken Beach and Angel Billabong if you want a driver and a few hours ashore.
For pace, the Sanur sample day shows what a private charter can match or beat: swim with mantas around 09:30, snorkel sessions at 10:30 and 11:30, lunch at a beach club near noon, Kelingking mid-afternoon, and a sail back around 17:00. Your Serangan charter can run the same arc, or skip the crowds entirely and just anchor off Lembongan.
How much does a private boat from Serangan cost?
Private whole-boat day charters in this stretch of Bali are priced per boat, not per person — typically IDR 8,000,000 to 44,500,000 (roughly USD 500 to 2,500) for a full private day as of 2026, depending on size and comfort.
For real per-boat reference points, Parahu.com’s 2026 Nusa Penida day-charter list runs from a 15-passenger Monohull SW3 at IDR 11,900,000 up through a 12-passenger Freedom at IDR 25,000,000 and a 35-passenger JA at IDR 44,500,000. Bluuu Tours advertises private Nusa Penida yacht tours from IDR 13,000,000 (about USD 750) per boat, and Blue Marlin Bali lists its Accura 39 from USD 750 for a four-hour coastal or sunset cruise and USD 950 for an eight-hour full day. All figures are “start from” rates published by those operators and are subject to change.
| Reference boat (operator, 2026) | Capacity | Per-boat price |
|---|---|---|
| 12m speedboat (Sanur Water Activities) | small group | from IDR 8,000,000 |
| Monohull SW3 (Parahu.com) | 15 pax | IDR 11,900,000 |
| Private yacht tour (Bluuu Tours) | per boat | from IDR 13,000,000 (~USD 750) |
| Accura 39, 8-hr full day (Blue Marlin Bali) | up to 17 | USD 950 |
A per-person tour is a different product entirely — Viator, for example, lists a Nusa Penida premium day from USD 73.62 per person — so compare the whole-boat total against your headcount before deciding.
The quick version
For a family or small group leaving Serangan, plan on roughly 30 to 45 minutes of water time to Nusa Lembongan on a private speedboat, a little more on a comfort-first cabin cruiser. Leave early, choose the vessel that suits your crew, and you will be swimming off Lembongan before the day-tripper crowds arrive.