There are quite a few, actually. However, the better ones out of the group (in terms of reliability and price) are the following:

VIP Trans - This company has been around for awhile and are one of the best ones on this list. They offer 24-hour shuttle service to and from the airport to various hotels in Waikiki. One-way and round-trip options are available, with discounts on round-trip fares. The drawback to VIP Trans is that they only drop off clients at hotels located within the general Waikiki and Ala Moana areas only.

Oahu Airport Shuttle - Another reliable option, although it’s a bit more expensive (approximately 2 Dollars more than VIP Trans’ rates). The upside to Oahu Airport Shuttle is that they service the entire island (see their rates for more information). While VIP Trans uses 25-27-seat buses, Oahu Airport Shuttle uses mini-vans that seat up to 5-7 people.

Reliable Shuttle is another good option to consider. With $19.00 round-trip and $11.00 one-way fares, Reliable Shuttle is presumably the most affordable out of the three. As with VIP Trans, this shuttle company only offers shuttle services from the airport to Waikiki and vice-versa.