Table of Contents
The drive from Miami to Key West along the legendary Overseas Highway (U.S. Route 1) is one of North America’s most iconic road trips. From Miami Downtown, the journey covers approximately 160 miles through a chain of coral and limestone islands, suspended over turquoise Atlantic and Gulf of Mexico waters via 42 bridges, culminating at the famous Seven Mile Bridge and ending at Mile Marker 0 in Key West. The secret to a stress-free departure is choosing car hire in Miami Downtown or Brickell or Brickell rather than joining the queues at Miami International Airport (MIA).
By collecting your vehicle in the city centre, you bypass the multi-hour queues, shuttle bus rides and hefty airport concession surcharges that inflate baseline rental rates at MIA. Whether you are staying in Brickell, Downtown or arriving on the Brightline high-speed train from Orlando, a city pickup positions you perfectly at the gateway to Florida and the Keys. This 5-day car hire in Miami Downtown guide gives you the full road trip blueprint, critical toll hacks, vehicle advice and local knowledge for a seamless Sunshine State journey.
Finding the Right Vehicle for the Overseas Highway
When booking car hire in Miami Downtown, your vehicle choice should match the scale of American highways. Unlike the narrow streets of Europe, Florida’s roads and parking bays are built for larger cars, and the Overseas Highway itself is designed to be driven at a relaxed pace where the journey is as important as the destination.
The recommendation: an intermediate or full-size SUV or a premium American convertible such as a Ford Mustang or Chevrolet Camaro, all available through car hire in Miami Downtown city depots. An SUV gives you an elevated driving position with clear views over the concrete bridge barriers and generous boot space for luggage, beach gear and a cooler. A convertible gives you the Atlantic breeze and Florida sunshine directly as you cruise down U.S. Route 1, which is the quintessential Keys experience. City-centre depots in Miami Downtown and Brickell tend to carry better-maintained premium fleets than the high-turnover airport terminals.
Essential US Driving Rules, Tolls and Strategic Pickup Tips
Why Car Hire in Miami Downtown Beats MIA
Most UK travellers automatically book airport collection at MIA, but the rental counters there are notorious for massive queues, shuttle delays and airport concession fees that can add 25 to 30 percent onto the baseline daily rate. Choosing car hire in Miami Downtown or Brickell instead means taking a quick taxi or the automated Metrorail directly to your city base, then collecting your vehicle the following morning from a hotel lobby or city depot. The process is significantly faster, the surcharges disappear and you join U.S. Route 1 South directly without fighting airport boundary traffic.
Navigating Florida’s Electronic Toll System
The fastest routes out of Miami toward the Florida Keys, including Florida’s Turnpike, are fully electronic toll roads with no cash lanes. If you drive through a toll gantry without a transponder, cameras read your rental plate and bill the supplier, who then charges you the toll plus an administrative fee of $5 to $10 per day for using their built-in transponder system.
The workaround is simple: buy a SunPass Portable transponder or SunPass Mini sticker for under $5 at a Publix supermarket or CVS pharmacy immediately on arrival. Load funds via the smartphone app, stick it to your windscreen and pay standard toll rates with no rental company markup. Current toll rates for the Florida Turnpike and U.S. Route 1 bridges are listed on the Florida Department of Transportation website.
The US Counter Insurance Trap
Car hire insurance in North America works differently from Europe. Basic rental rates for international visitors frequently exclude Collision Damage Waiver (CDW) and Supplemental Liability Insurance (SLI) unless specified at booking. Counter staff will offer premium bump-to-bumper waivers at $30 to $45 per day. Always confirm exactly what your booking includes before travelling and arrange any additional cover before you arrive at the desk.
The Complete 5-Day Florida Keys Road Trip Blueprint
All distances are from the car hire in Miami Downtown collection point. Allow more time than the mileage suggests: U.S. Route 1 through the Keys has a maximum speed limit of 55mph on most stretches and 35mph through towns, and the views will make you want to stop frequently.
Day 1: Miami Downtown to Key Largo
Collect your car hire in Miami Downtown vehicle from your chosen city depot and head south toward Florida’s Turnpike. As you leave the Brickell skyscrapers behind, the urban sprawl transitions into the agricultural plains of Homestead. From Homestead, take U.S. Route 1 South over the Stretch, a 19-mile highway corridor bridging the Florida mainland to Key Largo, the official gateway to the Florida Keys.
Key Largo is famous for its coral reefs and marine life. Spend the afternoon at John Pennekamp Coral Reef State Park, the first undersea park in the United States, where you can book a glass-bottom boat tour or snorkel out to the Christ of the Abyss statue. For dinner, try The Fish House for fresh locally caught hogfish prepared in traditional Keys style. State park parking is plentiful for large vehicles at around $8 per vehicle.
Day 2: Key Largo to Islamorada
Continue south down U.S. Route 1 to Islamorada, spanning Mile Markers 90 to 72. This stretch brings you closer to the water with ocean views opening on both sides. Islamorada is renowned for world-class sport fishing. Stop at Robbie’s Marina to hand-feed giant six-foot tarpon from the wooden docks, then explore the Windley Key Fossil Reef Geological State Park to walk inside an old quarry and view ancient fossilised coral in the limestone walls.
For the evening, park at Morada Bay Beach Café, a Hawaiian-style beachside venue where you can watch the Gulf sunset with live acoustic music while your feet are in the sand.
Day 3: Islamorada to Marathon and the Seven Mile Bridge
Cruise south through the Middle Keys toward Marathon. Before crossing the Seven Mile Bridge, stop at the Turtle Hospital, a non-profit veterinary facility inside a converted motel that rehabilitates injured sea turtles and returns them to the wild. Then prepare for the bridge itself: at 11.3 kilometres, it is the longest of the 42 bridges on the Overseas Highway, surrounded entirely by open shimmering ocean. Make sure your passenger has a camera ready.
Immediately after crossing, pull into Bahia Honda State Park. This award-winning park has some of the only natural white-sand beaches in the entire Keys alongside the rusting remnants of Henry Flagler’s historic railway bridge, which was destroyed by the Labour Day hurricane of 1935.
Day 4: Bahia Honda to Key West
Continue through the Lower Keys, passing through Big Pine Key. Keep strictly to the speed limits through this section: the endangered miniature Key Deer frequently roam near the highway shoulders and the fines for speeding in the Key Deer National Wildlife Refuge are substantial. U.S. Route 1 terminates at Mile Marker 0 in Key West.
Park at your hotel and explore Key West on foot or by bicycle. Visit the Ernest Hemingway Home and Museum, tour the writing studio and meet the descendants of his famous six-toed cats. In the evening, gather at Mallory Square for the nightly Sunset Celebration with street performers and local artists, then try authentic Key Lime Pie from Kermit’s Key West Key Lime Shoppe on Duval Street.
Day 5: Key West and the Return to Miami
Before heading north, walk to the Southernmost Point Buoy, 90 miles from Cuba and one of the most photographed landmarks in the United States. Then begin the return drive up the Overseas Highway in the afternoon, when the light illuminates the Atlantic side of the islands from a different angle. Stop at roadside fruit stands and local art galleries in the Lower Keys that you passed on the way down.
For the return vehicle drop-off, car hire in Miami Downtown depots accept direct returns. Alternatively, if flying home from MIA, most suppliers allow drop-off at the airport rental car centre on Day 5, with the airport people-mover train connecting directly to the departure terminals.
Practical Guide to Car Hire in Miami Downtown
Where to Collect Your Vehicle
The two most convenient collection areas for car hire in Miami Downtown are Brickell, close to the Brightline station and the financial district hotels, and Downtown Miami itself, centred around Biscayne Boulevard. Both areas have established city-centre depots from major and independent suppliers. The Metrorail connects Miami Airport directly to Brickell for travellers arriving by air who want to collect the car the following morning.
Best Time to Drive the Overseas Highway
November through April is the ideal window to book car hire in Miami Downtown and plan a Florida Keys road trip. Temperatures are warm but comfortable at 22 to 28 degrees Celsius, humidity is lower than in summer and the risk of tropical storms is minimal. December through February is peak season so book early and expect higher prices. May through October is hot and humid with an active hurricane season, though shoulder-season deals on car hire can be significant if you are comfortable with the weather risk.
For current UK government travel advice on visiting Florida including entry requirements, the FCDO USA travel advice pages are the authoritative source.
Frequently Asked Questions
Why is car hire in Miami Downtown better than collecting at the airport?
Car hire in Miami Downtown eliminates the airport concession surcharges that can add 25 to 30 percent onto baseline daily rates at MIA, as well as the shuttle bus delays and long queues at the terminal rental counters. City depots in Brickell and Downtown provide faster vehicle handover and position you directly on the route south toward the Florida Keys without battling airport boundary traffic.
Do I need an SUV or a convertible for the Miami to Key West drive?
Both are excellent choices. An intermediate SUV gives you an elevated driving position with clear sightlines over the bridge barriers, generous luggage space and air conditioning for the Florida heat. A premium convertible such as a Ford Mustang or Camaro gives you the quintessential Sunshine State experience with the top down along the Overseas Highway. The right choice depends on your group size and luggage requirements. Both are available through car hire in Miami Downtown city depots.
How do I pay tolls on a rental car driving from Miami to Key West?
Florida’s toll roads are fully electronic with no cash lanes. Buy a SunPass Portable transponder or SunPass Mini sticker for under $5 at a Publix or CVS immediately on arrival and load funds via the app. This avoids the $5 to $10 per day administrative fee rental companies charge for using their built-in transponder. Current toll rates are available on the Florida Department of Transportation website.
How far is it from Miami Downtown to Key West?
The drive from Miami Downtown to Key West is approximately 160 miles via U.S. Route 1 and the Overseas Highway, taking around three to four hours without stops. The Overseas Highway itself, from Florida City to Key West, is approximately 113 miles. With stops at Key Largo, Islamorada, Marathon and Bahia Honda, allow a full day for the southward journey.
Can I drop off a rental car at Key West Airport?
Yes, several major suppliers operating through car hire in Miami Downtown offer one-way rentals with drop-off at Key West International Airport (EYW) or Key West city locations. One-way fees apply and vary by supplier. Confirm one-way availability and the additional charge at the time of booking, as availability for premium vehicles and convertibles on one-way rentals can be limited during peak season.
Start Your Florida Keys Road Trip
The Overseas Highway is one of the great drives of North America, and car hire in Miami Downtown is the smart starting point. Skip the airport queues, collect your SUV or convertible from the city centre and head south on U.S. Route 1 toward one of the most extraordinary coastal road trips in the world. Compare car hire in Miami Downtown prices and availability for your dates using the booking tool below.
About the Author
Written by the Digitalhound.co.uk editorial team. Every guide is thoroughly researched with genuine local knowledge, verified driving rules, toll system guidance and route details gathered from on-the-ground experience.
★ Enjoyed this guide? Make getcarhire.com one of your Preferred Sources on Google.