A luxury car rental from Miami to Key West is possible, but it is a permission question before it is a driving question. The drive is roughly 160 miles each way on US-1 and takes about four hours without stops, so the round trip uses around 320 miles, more than three days of a typical 100-mile daily allowance. Ask the rental company in writing whether the Keys are inside the permitted territory, what the extra miles cost and whether an overnight stay changes the price. This site is an independent guide; it does not rent cars or take bookings.
What the Miami to Key West drive involves
The route follows US-1, the Overseas Highway, south from the mainland through Florida City and then along the island chain. Mile markers are the easiest way to keep track: they count down from the mainland toward Key West, where the road reaches Mile Marker 0. The highway crosses dozens of bridges, and the longest, the Seven Mile Bridge near Marathon, is just under seven miles. Distance figures differ between sources depending on the starting point in greater Miami, so treat 160 miles as an estimate and let a navigation app confirm it from your hotel.
Speeds are modest. Long stretches are posted at 45 to 55 mph and towns are slower, which is why the trip suits a grand tourer or convertible better than a car built for track speed. For the scenery stop by stop, see the scenic drives guide.
Will the rental company allow the Keys?
Territory rules are separate from mileage rules. Agreements often name a permitted area, and some companies require prior approval for the Keys or any trip outside the metro area. Driving outside the permitted territory can void insurance coverage or trigger a fee, depending on the agreement. The mileage limits guide explains how the two caps interact.
Before you plan, get the answers to these questions in writing:
- Is the Florida Keys inside the permitted territory for this specific car?
- Is approval needed, and does it carry a fee?
- Is the allowance counted per day, per rental or per 24-hour block?
- What is the per-mile overage rate for this model?
- Is there an unlimited-mileage option, and does a territory limit still apply?
- What happens if the car breaks down in the Keys, and who arranges recovery?
Mileage on a Key West trip
The arithmetic is the main reason many travelers choose a different car or a different plan. Using the roughly 160-mile estimate each way, here is how a few booking lengths compare against an illustrative 100-mile daily allowance. The allowance is an assumption for planning; your agreement sets the real figure.
| Plan | Approx. miles driven | Included at 100 miles/day | Result |
|---|---|---|---|
| Same-day round trip, one day | 320 plus local driving | 100 | Over by 220 or more |
| Overnight, two days | 320 plus local driving | 200 | Over by 120 or more |
| Two nights, three days | 320 plus local driving | 300 | Close to the cap, little room to spare |
Overage is billed per mile, and for supercars the rate can reach several dollars a mile. At only a few dollars a mile, 120 extra miles is already a four-figure line item for some cars. An unlimited-mileage add-on or a longer booking is often cheaper than paying overage, but compare the two quotes. The cost guide shows how daily rates, deposits and add-ons stack up.
Which car suits the Overseas Highway?
- Convertible: the classic choice. Open air on the bridges is the point of the trip, though midday sun and afternoon storms are common, so carry sunscreen and know how the roof works.
- Grand tourer or luxury coupe: comfortable for four hours each way, with more luggage room than most supercars.
- Luxury SUV: the practical pick for a group with bags, and a better fit for the low-speed, stop-and-go sections.
- Low-slung supercar: workable but tiring in slow traffic, with little luggage space and a nervous moment at every steep driveway or parking ramp.
Fuel, tolls and parking
US-1 through the Keys is the main route and the one most visitors use. If you use the alternative through Card Sound Road in North Key Largo, note that Monroe County runs the Card Sound Bridge toll, which is electronic only and has rates adjusted annually; the county's Card Sound Toll Authority page lists the current schedule. Tolls elsewhere on the way from Miami depend on which roads you take to reach the Florida City area, so check your rental's transponder arrangement first. The SunPass guide covers how rental companies bill tolls and the fees they add.
Fuel stations are spaced along the highway, but a premium-fuel car should start with a full tank, since the car is expected back full at return in many agreements. In Key West itself, curb parking in Old Town is limited and some spaces are for residents only. The City of Key West operates a public parking garage in Old Town, described on the city's parking garage page, and low-clearance cars should check the posted height limit before entering. Hotels often have their own rules for guest parking and valet.
Same-day return or overnight?
A same-day round trip means roughly eight hours of driving plus stops, with the return in the heavier late-afternoon traffic. Starting early and leaving Key West before the end of the day helps, and weekends tend to be busier. An overnight stay gives more time, spreads the mileage over two daily allowances and lets you return the car without rushing. If you stay overnight, ask where the car will be kept and whether the company wants it parked in a secured lot.
Weather matters too. Hurricane season brings storm warnings and possible evacuation orders for the Keys, and a rental car may be recalled or restricted during one. The hurricane season guide explains the rental side of that risk. Photograph the car at pickup and again on return so any damage claim is easy to sort out; the pickup checklist shows what to capture.
Frequently Asked Questions
Can I take a luxury rental from Miami to Key West?
Often yes, but only with permission. Many agreements limit the car to a named area, and some require approval for the Keys. Get written confirmation and the overage rate before you book.
How far is Key West from Miami by car?
Roughly 160 miles each way on US-1, depending on where in Miami you start. Expect about four hours of driving without stops, and longer in weekend or holiday traffic.
How many miles will a Key West round trip use?
About 320 miles plus local driving at each end. That is more than three days of a typical 100-mile daily allowance, so an extended or unlimited mileage option is worth pricing.
What is the best type of car for the Overseas Highway?
A convertible or grand tourer suits the speed limits and the scenery. A luxury SUV is the practical pick for luggage, while a low supercar is less comfortable in slow traffic and tight parking.
Should I do Key West in one day or stay overnight?
An overnight stay is usually less stressful and spreads the mileage over two allowances. A same-day round trip is possible but means long hours behind the wheel and likely overage charges.