248 miles
Charleston, SC. They also fly into Charlotte and Spartanburg, but those are pretty far away from Hilton Head.
The airport code for Hilton Head Airport is HHH.
The nearest major airport is Hilton Head Airport (HHH / KHXD). The airport has domestic flights from Hilton Head, South Carolina and is about 3 driving miles from the center of Hilton Head Island.
The closest airport is Charleston International, which is 63 miles away.
Drive time from Charlotte to Hilton Head is slightly less than 4 hours.
The Savannah/Hilton Head International Airport is only 7 miles from downtown Savannah.
Hilton Head Island has its' own airport! However, this time of year it is only serviced by US Air. The next closest airport is Savannah/Hilton Head International. This is about 40-45 mins. from the island. Southwest does fly in and out of there.
About 40 miles to Savannah/Hilton Head International Airport using US-278 and I-95.
254 miles
Savannah/Hilton Head International Airport
One of the many things that HHH has been used for is, indeed, the regional airport code identifier for the airport at Hilton Head island, South Carolina.
HXD is the airport identifier. (Or KHXD depending what you are using it for.)