One road, four very different islands
The Florida Keys are not a single destination — they are a chain of islands strung along a single road, and each one has a different personality. Key Largo is the reef and dive gateway closest to Miami. Islamorada is built around sport fishing and a slower, backcountry pace. Marathon sits in the middle, anchored by the Seven Mile Bridge. And Key West, at the far end, is a town in its own right — Duval Street, Mallory Square sunsets, the Ernest Hemingway house — and the departure point for the Dry Tortugas National Park, a fort on a remote island that no road reaches. This page covers the drive itself and how to divide your time between the four stops; Key West’s own guide and the Dry Tortugas guide go into the detail that belongs there, not here.
The correction to make early: the Florida Keys are not an afternoon add-on to a Miami trip. The Overseas Highway — the section of US-1 that hops from key to key on causeways and bridges — runs 113 miles and crosses 42 bridges between Key Largo and Key West. From Miami, Key Largo itself is a reasonable hour-long drive. Getting all the way to Key West and back in a single day is a long day behind the wheel or on a coach, and it eats most of the hours you’d otherwise spend on the water. How long that specific round trip takes, and whether it’s worth doing as a single push, is covered on the Key West day-trip guide — what matters here is the order of magnitude: several hours of driving each way, not a quick errand.
Key Largo: the reef, closest to Miami
Key Largo is the first of the Keys and the easiest to reach — about an hour from Miami by car. It’s built around one thing: the coral reef just offshore, protected inside John Pennekamp Coral Reef State Park, Florida’s first underwater park. Glass-bottom boat tours, snorkelling trips and dive charters all leave from here, and the most photographed underwater feature in the Keys — the bronze Christ of the Abyss statue, submerged in about 25 feet of water — sits within the park’s reef.
Because it’s the closest Key to Miami, Key Largo also works well as a half-day or full-day trip on its own, without continuing further down the highway. Divers can go straight to the statue with a guided dive to the Christ of the Abyss statue, while snorkellers who’d rather stay on the surface can join a snorkelling trip out to the same reef. Neither requires more than a morning. For the park itself, entry fees, and what else the reef holds, see the Pennekamp park guide and the broader Key Largo snorkelling and diving guide.
Islamorada: sport fishing and the backcountry
Continue south and the highway reaches Islamorada, which markets itself as the sport fishing capital of the world — with some justification. The flats and backcountry between Islamorada and the Everglades hold tarpon, bonefish and permit, drawing serious anglers, while offshore charters chase sailfish and mahi-mahi further out. It’s a quieter stretch than Key Largo or Key West: fewer big attractions, more charter boats and waterfront restaurants.
Islamorada is roughly 90 minutes to two hours from Miami by car, depending on traffic on US-1. It works as a stop on the way south rather than a destination on its own for most first-time visitors, though anglers often base themselves here for several days. For what else fills a day beyond fishing, see things to do in Islamorada.
Marathon: the middle Keys and the Seven Mile Bridge
Marathon sits roughly at the midpoint of the chain, and it’s here that the highway crosses its most famous span: the Seven Mile Bridge, one long straight run of road with open water on both sides — a genuine highlight of the drive rather than just a way to get past it. Marathon is also home to the Turtle Hospital, a working rehabilitation centre for injured sea turtles, and a more residential, less touristy feel than Key West.
A sunset cruise is one of the simpler ways to see the middle Keys from the water without committing to a fishing charter or a dive: a sunset cruise aboard the Marathon Mermaid runs out of Marathon’s marina in the evening. From Miami, Marathon is a good two to two and a half hours by car — past the point where most day-trippers turn back, and closer to the point where an overnight stop starts to make more sense than pushing on. See things to do in Marathon for the rest of what fills a stop here.
Key West: the end of the road
At mile marker zero, the highway ends at Key West — the southernmost city in the continental United States, and a genuinely different place from the three Keys before it: a compact, walkable town with its own nightlife, history and pace. Duval Street, the Mallory Square sunset gathering, the Ernest Hemingway house, and the Southernmost Point buoy all belong to Key West specifically, and get their proper treatment on the Key West destination page and things to do in Key West rather than here.
What matters for planning this leg of the trip is distance: Key West is genuinely far from Miami — a multi-hour drive each way along the full 113-mile, 42-bridge stretch of the Overseas Highway. Visitors who don’t want to drive can join an organised trip instead, such as a small-group day tour to Key West from Miami, which handles the driving both ways. Whether to drive yourself, book a coach tour, or stay overnight is a genuine trade-off covered in full on driving vs. bus tour to Key West and Key West vs. Key Largo as a day trip.
Key West is also the only practical departure point for the Dry Tortugas National Park, a remote cluster of islands about 70 miles further west, built around the 19th-century Fort Jefferson. There is no road out to the Dry Tortugas at all — the Overseas Highway ends at Key West, and the park is reached only by the official park ferry, by seaplane, or by private or chartered boat. It’s a full-day trip in its own right, with limited daily capacity and a separate entrance fee, and it deserves its own planning rather than being tacked onto a Keys road trip at the last minute. Full detail on getting there, costs and what to expect: Dry Tortugas National Park guide.
How much of the Keys to see, and how much time it takes
| Stop | Distance from Miami | Main draw | Minimum time worth spending |
|---|---|---|---|
| Key Largo | ~55 miles (~1 hour) | Reef diving/snorkelling, Christ of the Abyss | Half day |
| Islamorada | ~75 miles (~1.5-2 hours) | Sport fishing, backcountry flats | Half day to full day |
| Marathon | ~105 miles (~2-2.5 hours) | Seven Mile Bridge, Turtle Hospital | Half day |
| Key West | ~160 miles (~3.5-4 hours) | Duval Street, Mallory Square, Hemingway House, Dry Tortugas gateway | 1-2 full days |
Trying to hit all four stops properly in a single day is unrealistic once you account for the driving alone. Two common approaches work better:
- A single-day push to Key West, stopping briefly at Key Largo or Islamorada on the way, then driving straight back — long, but doable for visitors short on time. This specific itinerary is covered in depth on the Key West day-trip guide.
- A multi-day loop with an overnight stop, spending a night in Islamorada, Marathon or Key West itself, which turns the same distance into a relaxed two-to-four-day trip rather than a marathon of driving. The full route, stop by stop, is laid out on the Miami to Key West road trip itinerary; divers and snorkellers who want to prioritise the reef over the driving should look at the Florida Keys snorkelling and diving week itinerary instead.
Travellers with only a day or two and no interest in driving themselves can also combine several stops into one guided run, such as a 3-day Florida getaway covering Miami, the Everglades and Key West with a snorkelling stop, or a more direct run south with a day trip from Fort Lauderdale to Key West for visitors based further north.
Getting there and getting around
The only realistic way to see more than one Key in a day is by car, rented in Miami or Fort Lauderdale — traffic on US-1 through the Keys is often two lanes each way and can back up badly around holidays and weekends, especially near Islamorada and around the Seven Mile Bridge. There is no train service into the Keys, and public transit within them is limited to a few local bus routes aimed at residents rather than visitors. Coach day tours and organised excursions cover the highway for visitors who’d rather not drive it themselves, dropping the driving decision entirely.
Fuel, tolls (there are none on this stretch of US-1 itself, though mainland approaches may have some) and the slower pace of a two-lane road through dozens of bridges all add time compared with an interstate drive of the same distance — budget more time than a straight mileage calculation would suggest, particularly on the run down to Key West.
Money and practical notes
Prices in the Keys run in USD ($) and are shown before Florida’s sales tax and any local tourist tax is added, the same as in Miami. Fuel, food and lodging all tend to cost more the further south you go, with Key West carrying the highest prices of the four stops — a function of everything arriving by truck over the same single highway. A rough daily budget, excluding lodging, of $100-250 per person covers meals, a snorkelling or fishing outing and incidentals; a full-day charter or dive trip pushes that higher on its own, and current rates are best checked on the specific tour’s booking page rather than estimated here.
Sun protection matters more than it might seem: open water, boat decks and flats fishing all mean hours of direct exposure, and reef-safe sunscreen is worth carrying specifically for snorkelling and diving stops, since some reef areas restrict sunscreen ingredients. Hurricane season for this part of Florida runs June through November, with the highest risk from August to October; travel insurance and flexible bookings are worth considering for a trip planned in that window, without assuming a storm will or won’t happen on any given date.
Frequently asked questions about visiting the Florida Keys
Is the Florida Keys road trip a good day trip from Miami?
Key Largo alone works well as a day trip — it’s about an hour from Miami. Reaching Key West and back in one day is possible but long, covering the full 113-mile, 42-bridge highway twice; many visitors prefer to stop partway or add an overnight rather than doing the round trip in a single day.
How many bridges are there between Key Largo and Key West?
The Overseas Highway crosses 42 bridges over its 113 miles from Key Largo to Key West, the longest and best known being the Seven Mile Bridge near Marathon.
Can I drive to the Dry Tortugas National Park?
No. The Overseas Highway ends at Key West. The Dry Tortugas, about 70 miles further west, are reached only by the official park ferry, by seaplane, or by private or chartered boat — there is no road connection at all.
Which Key is best for snorkelling and diving?
Key Largo has the most established reef diving and snorkelling scene in the Keys, built around John Pennekamp Coral Reef State Park and the Christ of the Abyss statue. Islamorada and Marathon also offer reef trips, and Key West adds its own dive sites further south.
Do I need several days to see the Florida Keys properly?
To see Key Largo, Islamorada, Marathon and Key West without rushing, two to four days works better than a single day, allowing at least a half day at each of the first three stops and a full day or two in Key West itself.
Is the drive to Key West difficult?
The road itself is straightforward — mostly a two-lane highway with clearly marked bridges — but it is long, and traffic can slow considerably on weekends and holidays, particularly through Islamorada and around the Seven Mile Bridge.
What’s the best time of year to drive the Keys?
December through April, the dry season, brings calmer seas for snorkelling and diving and lower humidity. The wetter season from roughly May to October brings afternoon storms and falls within the Atlantic hurricane season, which runs June through November.
Is Key West part of “the Florida Keys” or a separate stop?
Key West is the southernmost and final Key on the Overseas Highway, and geographically part of the same island chain — but it functions as its own destination, with a different pace and its own set of sights, covered separately on the Key West destination page.
