Planning a first trip to Hawaii: compare the islands, days needed, seasons and arrival airports

For a first trip to Hawaii, most Thai travellers choose Oʻahu (Honolulu, airport code HNL) because transport and accommodation are easy, then add Maui (OGG) or the Big Island (KOA or ITO) if time allows. Plan at least a week for two islands, and remember that a US visa is required before you fly.

Which Hawaiian island suits which traveller?

Visitors mostly choose among four main islands: Oʻahu, Maui, the Big Island and Kauaʻi. Each has its own airport and a distinct character, and the table below matches island to travel style.

How many days do you need, and can you island-hop?

Allow roughly three to four days per island, since the main islands are linked by plane rather than by regular passenger ferry.

• About one week: Oʻahu alone, or Oʻahu plus one more island.
• Two weeks: three islands at a comfortable pace, such as Oʻahu, Maui and the Big Island.
• Inter-island flights are short, but check-in and baggage collection still take time like any other flight.
• If you rent a car, book separately on each island, because rental cars do not travel between islands.

When is the best time to visit Hawaii?

Hawaii can be visited all year, with a generally drier season and a wetter season, and in winter the north shores often have big waves that are unsuitable for casual swimming.

• Drier season: good for beaches and most outdoor plans, especially on south and west coasts.
• Wetter season: rain is more frequent on windward east sides and in the mountains, so keep an indoor backup plan.
• Winter: big north-shore waves are spectacular to watch, but follow warning signs and lifeguards.

How do you get from Thailand to Hawaii?

Most itineraries involve at least one connection, either through an Asian hub or through the US mainland, so check current schedules with airlines. The most common arrival airport is HNL in Honolulu.

• Thailand is not in the Visa Waiver Program, so ESTA is not available; apply for a B-2 visa through the DS-160 form and the US Embassy.
• Connecting through the US mainland also requires a US visa.
• If you connect via Japan, Korea or Taiwan, check that country's transit rules too.

What must you declare, and which sunscreen is allowed?

According to the Hawaii Department of Agriculture, all arriving passengers must declare plants and animals to protect the islands from invasive species.

• Use the Plants and Animals Declaration Form; the state piloted a digital Akamai Arrival system from March 2025, so check how your flight handles it.
• Do not bring fresh fruit, plants, soil or animal products without declaring them.
• Hawaii bans the sale of sunscreens containing oxybenzone and octinoxate to protect coral reefs, so choose a reef-safe formula.

How do you stay online while exploring Hawaii?

Hawaii is a US state, so a US eSIM works there. Signal is good in Honolulu and resort areas but has gaps on remote roads such as the Road to Hana, upcountry Big Island and the north-shore cliffs of Kauaʻi.

• Download offline maps before heading onto remote routes.
• Keep your Thai SIM active for bank OTPs, with data roaming switched off.
• See the related Hawaii eSIM guide for island-by-island coverage detail.

How do you get around once you are on an island?

On Oʻahu you can manage without driving, but on the other islands a rental car is usually the practical choice because sights are spread out and public transport is limited.

• Honolulu and Waikīkī: walking, public buses and ride-hailing with Uber or Lyft all work well.
• Maui, Kauaʻi and the Big Island: rent a car to reach viewpoints and trailheads.
• Driving is on the right; carry your Thai licence and an International Driving Permit (IDP) if the rental company asks for it.

What should you pack for Hawaii?

Pack light clothing, reef-safe sunscreen, a hat, sturdy walking shoes and a thin rain jacket, because weather changes quickly from place to place.

• US plugs are Type A and Type B at 120 V; check that your chargers are labelled 100–240 V.
• A Thai hair dryer rated only for 220 V needs a converter, or use a dual-voltage model.

See eSIM options for the USA