Plan the trip
before the map

When to go

There is no single best month for Indonesia. The country straddles the equator, and the monsoon arrives at different times in different places. The useful rule is: dry season in the south and east from May to October, calm seas in Maluku and Papua from October to April.

Window	Best for	Think twice about
January – March	Maluku, Raja Ampat, Banda; calm crossings	Bali, Java and Sumatra: heavy afternoon rain
April – June	Java, Bali, Flores, Sulawesi; green landscapes, fewer crowds	Raja Ampat: wind starts to build
July – September	Komodo, Sulawesi, Kalimantan, Sumatra; dry and clear	Peak domestic holidays; book trains and boats early
October – December	Raja Ampat, Banda; Java and Bali before the wet peaks	Bali and Lombok: rain returns in November

Religious and lunar calendars matter as much as the weather. Ramadan shifts about eleven days earlier each year; Eid al-Fitr is the busiest travel week in the country. Nyepi in Bali closes the airport for a day. Check both before you lock dates.

How long to give it

Distances look small on a map and take a day in practice. A ferry that leaves once a week, a flight that only operates on Tuesdays, a road that climbs for four hours: these are the real units of an Indonesian itinerary. The minimums below assume you are moving every few days, not every day.

Region	Minimum	Comfortable	Main time sink
Java	6 days	10 days	Train schedules, Bromo transfer
Sumatra	7 days	10 days	Road distances
Bali & Nusa Tenggara	8 days	14 days	Ferries and inter-island flights
Sulawesi	7 days	12 days	Makassar–Toraja road
Maluku & Papua	10 days	16 days	Boat schedules, park transfers
Belitung & Riau	5 days	8 days	Getting between the two groups
Kalimantan	6 days	9 days	River boats and internal flights

Getting in

Jakarta (CGK), Denpasar (DPS), Surabaya (SUB), Medan (KNO) and Makassar (UPG) are the main international gateways. Bali has the most direct long-haul connections; Jakarta has the most domestic connections. If your trip starts in Raja Ampat, fly to Sorong via Jakarta or Makassar rather than trying to connect through Bali.

Visa rules depend on your passport. Most visitors use the e-VOA, a 30-day visa on arrival that can be extended once; ASEAN nationals and a few others enter visa-free. Apply online before you fly to avoid the airport queue, and check the current rules on the official immigration site rather than a blog. Passports must be valid for at least six months.

Bali charges a separate tourist levy of IDR 150,000, paid online or at the airport. Keep the confirmation. Other regions do not currently charge it, but park fees are separate everywhere and are usually paid in cash.

Getting around

Rail

Java is the only island with a serious railway. Book on the KAI app or at the station; executive class is comfortable and cheap by European standards. The Whoosh high-speed line links Jakarta and Bandung. For Yogyakarta and Surabaya, the conventional night trains are still the useful ones.

Road

Buses cover almost everywhere, but a car with a driver is often better value for two or more people. Ride-hailing works in cities; outside them, agree the price before you get in. Driving yourself is possible, but an international driving permit plus local rules and left-hand traffic make it a poor first choice.

Sea

Ferries are the backbone of the east: ASDP runs the main routes, and local boats fill the gaps. Schedules are weather- and cargo-dependent; always ask the day before. Fast boats are quicker and less comfortable. For Raja Ampat, the Sorong–Waisai ferry is the reliable option.

Air

Domestic flights are inexpensive and cut days off the itinerary. Book with a local app or airline site, allow a generous connection, and expect luggage limits of 20 kg on full-service carriers and less on the small props. Morning flights are less likely to be delayed by afternoon storms.

What it costs

Indonesia can be very cheap or surprisingly expensive, mostly depending on whether you are moving by boat or by private car. The ranges below are per person per day, excluding international flights and diving courses. They are deliberately broad.

Style	Per day	What that buys
Backpacker	IDR 400,000–700,000	Dorm or fan room, warung meals, buses, shared boats
Mid-range	IDR 900,000–1,800,000	3-star room, some domestic flights, a guide or two
Comfort	IDR 2,500,000+	Boutique hotels, private drivers, liveaboard days

Cash still matters. ATMs are common in cities and rare on islands; carry enough rupiah for a week in Raja Ampat, Banda or the Derawan islands. Cards work in hotels and upmarket restaurants, not in village homestays or on boats.

Health & safety

Travel insurance is not optional if you are going to remote islands; medical evacuation is the expensive part. Routine vaccinations should be current, and hepatitis A and typhoid are sensible for any trip. Malaria risk exists in parts of Papua, including some Raja Ampat islands; discuss prophylaxis with a travel clinic. Dengue is present nationwide and mosquito precautions matter more than any single vaccine.

Drink bottled or filtered water, eat where the food turns over quickly, and carry oral rehydration salts. The sun is strongest in the middle of the day, especially on the water. Boat trips should have life jackets and a working radio; if they do not, find another boat.

Indonesia has strict drug laws and severe penalties. Traffic is the other real risk: wear a helmet, do not ride at night on unfamiliar roads, and check that your travel insurance covers scooters. Earthquakes and volcanic ash can close airports at short notice; build a spare day into any tight connection.

What to pack

Pack for heat, rain and respectful temple visits. A light rain shell, quick-dry clothes, trainers with grip for volcano climbs, sandals for boats, a sarong, reef-safe sunscreen, a power adapter (230V, type C or F), and a dry bag. Bring less than you think; laundry is cheap and every extra kilogram is a problem on a small plane.

Photographers: bring spare batteries and cards, and a rain cover. Power can be intermittent on islands. A torch is useful in Banda and on klotoks. Leave the drone at home unless you have checked the park rules; many marine parks restrict them.

Travelling well

Pay park fees, use licensed guides and stay in village-owned homestays where they exist. Refuse single-use plastic when you can; remote islands have no waste system, and what you bring may be burned or buried. Keep three metres from manta rays and never chase a turtle. Ask before photographing people, ceremonies or graves.

Dress modestly outside Bali’s beach areas: shoulders and knees covered at temples, and a sarong at religious sites. Learn a few words of Indonesian — terima kasih, selamat pagi, berapa? — and use your right hand to give and receive. It is a small effort that changes the tone of a trip.