Should you even try to see two islands in one trip?
The honest answer: only if you have eight or more days, and ideally ten. A common first-timer mistake is splitting a six- or seven-day trip across three islands — you end up spending your vacation in airports and rental car lines instead of on any single beach long enough to relax. If this is your first trip to Hawaiʻi, seriously consider one island, done properly, over a rushed multi-island itinerary.
How inter-island flights actually work
Hawaiʻi's inter-island network runs mostly on Hawaiian Airlines and Southwest, with frequent short hops (typically 35–50 minutes in the air) connecting Honolulu to Kahului, Kona, Hilo, Līhuʻe and Molokaʻi. Flights are frequent on the main routes — often hourly during the day between Oʻahu and Maui — so you generally don't need to book these more than a few weeks out, unlike the transpacific leg.
The alternative: interisland ferry
The Maui–Lānaʻi ferry (Expeditions) is the one regularly scheduled passenger ferry route left in the state, running between Lahaina and Lānaʻi and making a Lānaʻi day trip from Maui genuinely realistic without flying. There is currently no scheduled passenger ferry service connecting the other main islands — if you see one advertised, double-check it's still operating before you plan around it.
Packing your itinerary in the right order
- Land where your flight is cheapest/most direct, usually Oʻahu, then hop onward.
- Put the quietest island last — ending a trip on Kauaʻi or Molokaʻi rather than Oʻahu tends to make the whole trip feel like it's winding down gently instead of ending in traffic.
- Never schedule an inter-island flight for the same day as your international or mainland departure — fly back to your final island the evening before.
Car rentals, twice
You will need a separate rental car on each island — you cannot drive a rental car onto the inter-island flights. Factor two (or three) full rental agreements into your budget, not one.