How to get to Izu Oshima
Tokai Kisen runs jetfoils between Izu Oshima and Tokyo's Takeshiba Ferry Terminal (about two hours, around 5000 yen one way, 3-5 departures per day), with some ferries stopping at Kurihama or Tateyama en route. Takeshiba Ferry Terminal is located just beside Takeshiba Station on the Yurikamome Line. There are also ferry connections between Oshima and Atami (one hour, about 5000 yen one way, 2-4 departures per day) and Shimoda (one hour, 3000 yen one way, 1 departure per day in winter only).
By air from Haneda Airport
ANA operates one round trip per day between Tokyo's Haneda Airport and Oshima Airport. Flight duration is approximately 40 minutes, and the regular one way fare is about 15,000 yen; however, discount tickets are usually available from around 9,000 yen if reserved in advance.
By air from Chofu Airport
New Central Airservice operates three daily flights in each direction between Tokyo's Chofu Airport and Oshima Airport. The one way trip takes approximately 25 minutes and costs 11,800 yen. To get to Chofu Airport, take the Keio Railway from Shinjuku to Chofu Station (15 minutes, 240 yen one way) and transfer to a bus (15 minutes, 220 yen) or taxi (15 minutes, about 1500 yen) to the airport.
How to get around Izu Oshima
Izu Oshima's largest town is Motomachi around Motomachi Port on the island's west coast. Smaller towns are also located around Okata Port in the north and Habu Port in the south.
Izu Oshima has a unique system whereby all ferries use either Motomachi Port or Okata Port depending on weather and sea conditions. The port to be used is decided on a daily basis and announced on the ferry operator's website (Japanese only). You can also check with staff at the hotel or ryokan you are staying at. Rental car pickups and bus services will be adjusted according to the selected port of the day.
Because public transportation is not too convenient on Izu Oshima, rental cars are a convenient way to tour the island. Rental outlets are found at Motomachi Port, but with prior arrangement, cars can also be picked up and returned at Okata Port or the airport. Alternatively, rental bicycles are available near Motomachi Port for typically 600 yen per hour or 1500 yen per day. With a circumference of about 50 kilometers and a mountain at its center, the island is not easily explored by bicycle entirely, though.
Oshima offers a bus network with relatively frequent service along the coastal roads, except the eastern coast which is not served. Bus service into the island's interior is infrequent. Bus fares range from 250 to 890 yen depending on distance traveled.