Book the April-to-November window for the driest seas, expect manta activity at Sangalaki to track plankton concentrations, and treat any El Niño year as a reason to keep turtle and jellyfish-lake visits (which do not depend on ocean upwelling) as your fallback. As of September 2026, no operator or authority has published a 2027 seaplane timetable, so treat every date below as a planning scenario, not a confirmed schedule.
What Is the 2027 Derawan Dive Season, and When Does It Run?
Private trip operators serving the archipelago run their main season from April through November. Indonesia Juara’s Derawan itinerary meets travelers at Kalimarau Airport (BEJ) within that window, requires a minimum of two travelers and starts from USD 281 per person, per a listing dated August 5, 2026 and updated August 17, 2026. That eight-month season lines up with Indonesia’s dry-to-transitional months, when seas around Derawan, Maratua, Kakaban and Sangalaki run calmer than during the December-to-March monsoon.
A 2027 season built on the same calendar would likely still open in April and taper by November, but nobody has confirmed 2027 dates publicly. Treat any month-by-month plan below as a working scenario based on how operators have run 2026 and earlier, not a published 2027 calendar.
How Would El Niño Conditions Affect a 2027 Trip?
El Niño years are associated, in general climate terms, with warmer sea-surface temperatures and weaker upwelling across the western Pacific and Indonesian seas. Weaker upwelling means less of the cold, nutrient-rich water that feeds plankton, and plankton is what draws manta rays and whale sharks to feed. In a strong El Niño year, divers and marine guides across Indonesia have generally reported fewer pelagic encounters and sometimes reduced visibility from algae blooms; a neutral or La Niña year tends to run the other way, with cooler water and steadier plankton supply.
No source behind this article names a specific El Niño forecast, sighting rate or visibility figure for Derawan in 2027, so no such number appears here. El Niño-type years are simply a reason to build flexibility into a trip rather than betting everything on one pelagic encounter. Kakaban’s landlocked lake, home to four species of non-stinging jellyfish and the separate Kehe Daing Lagoon, is not affected by ocean-current variability the way open-water manta or whale-shark sightings are, making it a dependable anchor point. The same logic applies to Sangalaki’s turtle conservation centre and Maratua’s Dolphin Point, turtle point and Halo Tabung Cave/Blue Lagoon.
Anyone chasing a specific species should build in a buffer day rather than a single fixed date, since pelagic sightings anywhere in Indonesia are seasonal and operator-reported, never guaranteed — including for the whale sharks the archipelago is known for. Travelers researching that trip can see how operators structure a Derawan whale shark trip around this same seasonal uncertainty, booking a window rather than a single date.
What Should Divers Book Early for 2027?
Manta season at Sangalaki’s Manta Ray Point draws the most advance bookings, since manta encounters are the most requested sighting in a region marketed as Borneo’s manta and turtle destination. Turtle sightings at Sangalaki’s conservation centre and Maratua’s turtle point run more consistently and need less advance planning. Whale-shark interest is highest but least predictable, since no source gives a whale-shark calendar, a location tariff or any governing regulation; sightings are seasonal and operator-reported, best booked as a hoped-for bonus.
The table below sets out what private operators in the region typically prioritize month to month during the April-to-November season, based on how the season is structured rather than on any confirmed 2027 schedule.
| Month | Typical Sea Conditions | What Operators Usually Prioritize |
|---|---|---|
| April | Transitional, seas settling after monsoon | Season opening, first manta and turtle trips |
| May | Improving visibility | Sangalaki manta viewing, Kakaban jellyfish lake |
| June | Dry-season conditions building | Peak booking window opens for July-August |
| July | Calm seas, high demand | School-holiday families, Maratua dive sites |
| August | Peak dry season | Highest occupancy across Derawan and Maratua |
| September | Still calm, demand easing | Dive-focused travelers, fewer crowds |
| October | Transitional, seas can shift early | Last reliable window before monsoon return |
| November | Onset of wet season | Trip operators start winding down departures |
How Do Travelers Actually Reach the Archipelago in 2027?
Whatever the seaplane conversation eventually produces, the documented route in 2026 runs through Kalimarau Airport (BEJ) in Teluk Bayur district, Berau Regency, which a 2019 Liputan6 report already called the tourism gateway to Derawan, Maratua, Kakaban and Sangalaki. Travelers fly into BEJ via Balikpapan (BPN) or Tarakan (TRK), then continue overland and by boat.
From Kalimarau, the road to Tanjung Batu jetty takes roughly two to two-and-a-half hours (one itinerary quotes two-and-a-half to three), after which speedboats fan out: Tanjung Batu to Derawan runs about 30 minutes, to Kakaban about an hour, and to Maratua or Sangalaki about two hours, for a door-to-jetty total near three hours. Separately, a public speedboat leaves Tanjung Redeb pier around 10:00 and reaches Maratua in about two-and-a-half hours; Tanjung Redeb harbour boats to Maratua, Sangalaki or Kakaban run about two hours each way, first departure 08:00, last 16:00. Derawan to Kakaban by speedboat runs about an hour.
Air access within the archipelago itself is limited. Maratua is the only island with an airstrip, served only by Wings Air, twice weekly. Derawan, Kakaban and Sangalaki have no airport and are reached exclusively by boat. Green Nirvana Resort states the archipelago is reachable “by boat or small airplane” after landing at BEJ, confirming small-aircraft arrivals already happen in some form, but no source names a seaplane operator, a designated water-landing site, a water aerodrome, a specific regulation, or any government priority status for water landings in East Kalimantan. Any 2027 seaplane route would remain subject to operator approval and prevailing conditions, and as of September 2026 no water aerodrome is documented for the region.
What Do 2027 Trips Cost, and How Should Travelers Budget?
No verified seaplane charter price, per-hour rate, fuel surcharge or landing fee for a Berau-to-Derawan route exists in any source reviewed for this article. Every seaplane figure for the region should be treated as quote-on-request until an operator publishes one. Surface and boat-based benchmarks are documented and give a useful sense of scale for 2027 budgeting.
| Service | Price (as documented) | Source Detail |
|---|---|---|
| Indonesia Juara Derawan trip (BEJ meet-up, Apr-Nov season, min. 2 travelers) | From USD 281 per person | Listed 2026-08-05, updated 2026-08-17 |
| Open Trip Derawan 3D2N via Berau | IDR 500,000 deposit per person | Updated 2026-04-29 |
| Scuba Junkie Sangalaki taxi plus boat | quoted on request | Published operator rate |
| LuxuryPhinisi Derawan phinisi charter | quoted on request | Published operator rate |
| Derawan-to-Berau seaplane charter | Quote on request | No published rate documented |
These figures come from named operators, not any official government tariff, and all are subject to change. Treat the boat and speedboat prices as the reliable baseline and request a direct quote for any seaplane segment.
What Else Is Shaping the 2027 Outlook?
A few regional trends are worth factoring into 2027 planning, even though none changes the honest picture on seaplane access or El Niño impacts. Authorities have cited a Maratua visitor target of roughly 30,000 for 2026, signaling rising demand on accommodation and boat capacity. A 2026 famtrip specifically targeted Malaysian and Singaporean dive centres, and Berau’s local administration is upgrading waste-management systems with tourism goals attached, though no source ties a completion date to the 2027 season.
Travelers arranging longer stays should also know Indonesia’s broader visa ecosystem — the e-VOA, B211A, E33 Second Home visa, E33G remote-worker visa and Golden Visa — as general context only, not advice; none is specific to Berau or Derawan.
Taken together, the honest 2027 outlook is this: the April-to-November season is likely to repeat because it tracks Indonesia’s dry-season weather, not one operator’s preference; El Niño-type years can reduce plankton-driven pelagic encounters in general terms without a specific number attached to Derawan; and no seaplane timetable or water-landing scheme exists in public documentation as of September 2026. Book the boat-based route that is already proven, treat pelagic sightings as a bonus, and request a direct quote for any seaplane component.
Frequently Asked Questions
When should I book a 2027 Derawan trip to avoid the worst of El Niño-related visibility drops?
No 2027 El Niño forecast for Derawan is published as of September 2026, so book the April-to-June or September-to-October stretches of the season, which generally see calmer seas before or after peak-demand months, and confirm current visibility with your operator close to departure rather than months in advance.
Is the seaplane route to Derawan confirmed for the 2027 season?
No. As of September 2026, no operator, authority or public source has confirmed a 2027 seaplane timetable or a designated water-landing site for the Derawan archipelago. Any seaplane segment should be treated as a request-and-confirm item, arranged directly with a licensed operator ahead of travel, not booked from a published schedule.
Will an El Niño year still be worth visiting Kakaban’s jellyfish lake and Maratua’s turtle sites?
Yes. Kakaban’s landlocked lake and Maratua’s turtle point are not driven by the same ocean-current and plankton patterns that affect open-water manta or whale-shark sightings, so El Niño variability has little documented bearing on those specific attractions, making them a reliable core for any 2027 itinerary regardless of pelagic conditions.