Charleston to Key West Road Trip: Ultimate Guide

Romanian-born naturalist Mark Catesby first documented the unique flora along this coast in the 1730s. His watercolors still hang in the Charleston Museum, marking the start of a 880-mile journey down US-17, I-95, and eventually the famed Overseas Highway (US-1). The drive typically takes 12-14 hours of pure driving time, but most travelers stretch it over 4-7 days to soak in the Atlantic seaboard's changing character.

This is not a straight shot. The route weaves through Savannah's moss-draped squares, Florida's historic fortresses, and over 42 bridges that leap from island to island. The question how long to drive Charleston, SC to Key West, FL is simple; the real answer is: as long as you let it. Before you go, learn how to find the best stops and hidden gems between cities to make every mile count.

The route primarily follows US-17 south from Charleston to Savannah, then I-95 to Miami, and finally US-1 (Overseas Highway) to Key West. Total distance is approximately 880 miles. Gas stations are plentiful along I-95 and in every town, but between Florida City and Key West, fuel stops become sparse. Fill up in Florida City—the last mainland exit—to avoid premium prices on the islands.

The Overseas Highway (US-1) is a two-lane road for much of its length, with speed limits dropping to 45-55 mph over the bridges. Traffic can back up during winter (Dec-Apr) and on weekends. Expect tolls on portions of I-95 in Florida; carry a SunPass or have cash ready. The most scenic stretch is the Seven Mile Bridge at Marathon, which offers pull-offs for photos.

Fuel and Route Economics

• Average gas price in 2024: $3.30/gal mainland, $3.80/gal in Florida Keys.
• Total fuel cost (sedan, 30 mpg): roughly $100-120 one-way.
• Budget chain hotels along I-95: $80-120/night. Florida Keys: $150-300/night (off-peak).
• Best value lodging: State park cabins (e.g., Anastasia State Park) or motels in Marathon.

Interstate 95 between Savannah and Miami is well-maintained but can be monotonous. The Overseas Highway demands focus—narrow lanes, sudden curves, and stunning views that can distract. Watch for wildlife: alligators near freshwater, manatees in canals, and iguanas in the Keys. At night, deer become a hazard on I-95's rural stretches near the Georgia-Florida line.

Speed traps are common in small Georgia towns (e.g., Ludowici) and on Key Largo's stretch. The Highway Patrol frequently monitors using aircraft. Make sure your spare tire is inflated—there are long gaps between services in the Everglades and Keys.

Family and Child Suitability

• Kid-friendly stops: Georgia Sea Turtle Center (Jekyll Island), St. Augustine Alligator Farm, Kennedy Space Center (Cape Canaveral), Theater of the Sea (Islamorada).
• Best parks: Fort Clinch State Park (Fernandina Beach) for beachcombing and cannon firing; Bill Baggs Cape Florida State Park (Key Biscayne) for lighthouse climb and calm waters.
• Interactive experiences: Pirates & Treasure Museum (St. Augustine), Skunk Ape Research Headquarters (Everglades).

Pet-Friendly Framework

• National parks: Dry Tortugas (pets not allowed except service animals), but state parks like Bahia Honda (marathon) allow leashed pets on designated beaches.
• Hotels: La Quinta, Motel 6, and Kimpton properties welcome pets without extra fees. In the Keys, many vacation rentals allow pets.
• Restaurants: Outdoor patios at Hogfish Bar & Grill, Blue Heaven, and Mrs. Wilkes' courtyard are pet-friendly.
• Check vaccination records; Florida requires rabies tags up to date.

Fatigue Management & Rest Zones

• I-95 welcome centers in Georgia (just south of Savannah) and Florida (near Yulee) have clean restrooms, picnic tables, and pet areas.
• Strategic stops every 2 hours: Beaufort (SC) at mile 105, Brunswick (GA) at mile 190, St. Augustine (FL) at mile 320, Fort Pierce (FL) at mile 490, Miami at mile 680.
• The Florida Turnpike (alternative to I-95 from Wildwood to Miami) has service plazas every 30-40 miles with fast food, coffee, and gas.
• Key West's limited space means book parking in advance. The city's Park & Ride (at the old Key West Golf Club) offers shuttle service.

Hidden Off-Route Spots

• Cumberland Island, GA: Accessible only by ferry from St. Marys. Wild horses, untouched beaches, and the ruins of Dungeness mansion. Requires a reservation for the ferry.
• Pelican Island (Vero Beach): America's first National Wildlife Refuge (1903). Boardwalks through mangroves; best visited winter mornings for birding.
• Coral Castle (Homestead): A mysterious structure built single-handedly by Edward Leedskalnin using 1,100 tons of coral rock. Not marketed widely, but a roadside oddity.
• Laura Quinn Wild Bird Sanctuary (Islamorada): Free admission; walk through large aviaries with rehabilitated pelicans, herons, and spoonbills.

From the lowcountry marshes of South Carolina to the mangrove tunnels of the Keys, the landscape transforms dramatically. Hunting Island State Park (near Beaufort, SC) offers a historic lighthouse and pristine beach—one of the few undeveloped stretches on the East Coast. In Georgia, the Okefenokee Swamp is a detour worth the hour; paddle through dark water trails lined with cypress knees.

Florida's Atlantic coast delivers contrasting scenes: the white quartz sand of Siesta Key (though slightly off-route), the dune lakes of Topsail Hill Preserve, and the coral rock of John Pennekamp Coral Reef State Park in Key Largo. The Keys themselves are a limestone archipelago, each island with its own character—Islamorada is the sportfishing capital, Key West the quirky end of the line.

UNESCO World Heritage Sites and Cultural Gems

• Savannah Historic District: A National Historic Landmark district (not UNESCO but equivalent) with 22 squares, each a distinct green space.
• Castillo de San Marcos (St. Augustine): The oldest masonry fort in the continental U.S., built 1672-1695. Cannon firings daily.
• Morikami Museum (Delray Beach): A serene Japanese garden and museum—unexpected cultural respite off I-95.
• Dry Tortugas National Park: A UNESCO World Heritage Site candidate accessible by ferry from Key West. Fort Jefferson, a massive 19th-century coastal fortress, sits 70 miles away.

Culinary Infrastructure

• Charleston: Husk (Southern reinterpretation) and FIG (farm-to-table). Lowcountry boils and she-crab soup.
• Savannah: Mrs. Wilkes' Dining Room (family-style Southern lunch); The Grey (in a former Greyhound bus station).
• St. Augustine: Columbia Restaurant (Spanish-Cuban since 1905); datil pepper shrimp.
• Key West: Blue Heaven (Key lime pie, lobster benedict); Hogfish Bar & Grill (fresh catch).