The Miami to Key West road trip follows US-1 into the Florida Keys, with the Overseas Highway covering roughly 113 miles from the Miami area to Key West. With no major stops, the drive takes about 3.5 hours, but most travelers need considerably longer once island stops, meals, viewpoints, and traffic are added.
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The route remains a major tourism corridor. Monroe County, which includes the Florida Keys, reports that visitors spend about $3.5 billion each year in the Keys, supporting more than 24,000 local jobs. Visitor demand also changes through the year: the Keys actively promote August through October as a lower-crowd period, while winter attracts strong demand.
This guide covers the full Overseas Highway Florida Keys route, including the best stops, the Seven Mile Bridge drive, timing, and practical planning tips. It also answers the big question: can you do Key West as a day trip from Miami, or is an overnight stay better?
For a broader Florida route plan, see our Florida road trip itinerary guide before adding the Keys to your trip.
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Table of Content
Miami to Key West Route Overview
The Miami to Key West road trip covers about 113 miles along US-1, known as the Overseas Highway. The drive takes roughly 3.5 hours without stops and crosses more than 40 islands in the Florida Keys. Since US-1 is the main road connecting the Keys, there is no practical alternate coastal route.
The route begins in the Miami area and continues southwest through the Keys before reaching Key West. Once you leave the mainland, the Overseas Highway becomes the main road for nearly the entire journey, making the route fairly simple to follow.
| Route Section | Approx. Distance | No-Stop Drive Time |
|---|---|---|
| Miami → Key Largo | 60 miles | 1.5 hours |
| Key Largo → Marathon | 50 miles | 1–1.25 hours |
| Marathon → Key West | 50 miles | 1–1.25 hours |
| Miami → Key West | ~113 miles | ~3.5 hours |
The driving time can increase quickly once you add stops, traffic, meals, and time at attractions. For a first trip, treating the Overseas Highway as a route with several planned stops is more useful than trying to reach Key West as quickly as possible.
The lack of a meaningful alternate route also makes planning easier. You mainly need to decide where to stop and how long to stay, rather than choosing between multiple highway routes.
Is Key West a Day Trip From Miami or Should You Stay Overnight?
Yes, a Key West day trip from Miami is possible, but it means spending roughly 7 hours driving round trip before accounting for stops. You can reach Key West, spend several hours there, and return to Miami the same day. For most travelers, staying at least one night is the better option because it gives you time to stop along the Overseas Highway and explore Key West without rushing.
Key West Day Trip From Miami
A same-day trip works best when your priority is simply seeing Key West and returning to Miami.
A day trip realistically allows you to:
- Leave Miami early and reach Key West around late morning.
- Spend several hours exploring central Key West.
- Have lunch or dinner before starting the return drive.
- Return to Miami late in the evening.
What you are likely to miss:
- Longer stops in Key Largo and Islamorada.
- A relaxed Seven Mile Bridge drive and nearby attractions.
- Time in Marathon and other Middle Keys communities.
- A slower afternoon or evening in Key West.
- Flexibility if traffic or weather delays the journey.
Staying Overnight
One night in Key West makes the trip much easier to manage. You can break up the drive, arrive with enough time to explore, and avoid spending most of the day behind the wheel. Two nights are even better if Key West is a major part of your trip.
If you have 2–3 days, consider making the drive south over one day, staying in Key West, then using the return journey for additional Keys stops.
Bottom line: Choose a day trip if your schedule is tight and Key West is the main goal. Stay overnight if you want to experience the Overseas Highway and the Keys rather than treating Key West as a quick stop.
The Best Stops Along the Overseas Highway
Key Largo and Islamorada
Key Largo is the first major stop after leaving mainland Florida and a natural introduction to the Overseas Highway Florida Keys route. The area is known for access to snorkeling, diving, fishing, and other water activities, making it worth allowing a few hours if you do not want to drive straight through.
John Pennekamp Coral Reef State Park is one of the main attractions in Key Largo. The park offers opportunities for snorkeling, diving, kayaking, and glass-bottom boat tours, depending on conditions and availability. Check current park information before planning a specific activity.
Continue south to Islamorada, where the pace becomes more focused on fishing, waterfront restaurants, and time by the water. It is a useful overnight option if you are splitting the Miami to Key West road trip into two days.
For a short itinerary, choose one or two stops rather than trying to cover every attraction in the Upper Keys.
Best for: Snorkeling, diving, water activities, and an easy first stop in the Keys.
Marathon and the Seven Mile Bridge
The Seven Mile Bridge drive is one of the defining sections of the Overseas Highway. Located in the Middle Keys, the bridge connects Marathon with the Lower Keys and crosses a long stretch of open water.
The modern bridge carries vehicle traffic, while the old Seven Mile Bridge runs alongside it for much of the crossing. The contrast between the two structures is especially noticeable from nearby viewing areas.
One important driving rule: do not stop on the bridge or use the roadway shoulder for sightseeing. The bridge is a working highway, not a roadside viewpoint. Instead, use designated parking and viewing areas before or after the crossing. Veterans Memorial Park in Little Duck Key and Old Seven Mile Bridge at Pigeon Key are useful places to look for views, although access and parking conditions can vary.
Marathon is also worth more than a quick fuel stop. You can use the city as a base for beaches, boating, wildlife attractions, and a meal before continuing south.
Allow extra time around this section during busy travel periods. A bridge crossing that takes only a short time can become slower when traffic builds, and there are limited opportunities to pull over once you are on the bridge.
Best for: Open-water views, photography, bridge scenery, and one of the most distinctive sections of the Keys drive.
Lower Keys to Key West
After Marathon, the Overseas Highway continues through the Lower Keys, where development becomes more spread out and the route includes more natural areas. One worthwhile stop is Bahia Honda State Park, known for its beaches, clear water, and views toward the old Bahia Honda Bridge.
Check the park’s current operating status and conditions before visiting, as access can change.
From Bahia Honda, continue through Big Pine Key and the surrounding Lower Keys before making the final approach to Key West. Keep an eye out for the local wildlife, particularly the protected Key deer around Big Pine Key, and follow posted speed limits carefully.
The road eventually reaches Key West, where Mile Marker 0 marks the southern end of US-1. From here, you can leave the car behind and explore the compact downtown area on foot, depending on where you stay.
For travelers completing the Miami to Key West road trip, this final stretch works best when you have enough time to stop before arriving in Key West rather than treating the entire Keys as one continuous drive.
Best for: State parks, wildlife, quieter roads, and the final approach to Key West.
How Long Does the Drive Actually Take?
The Miami to Key West road trip is only about 113 miles, but the time you need depends heavily on how many stops you make. The Overseas Highway is the main road through the Keys, so traffic, crashes, construction, or other delays can affect the entire route.
| Travel Style | Approx. Time | What It Looks Like |
|---|---|---|
| No-stop drive | ~3.5 hours | Direct drive with no sightseeing |
| With key stops | 5–8 hours | A few beaches, viewpoints, meals, and short breaks |
| Full-day road trip | 8–10+ hours | Several stops before reaching Key West |
| 2-day trip | 1.5–2 days | Overnight around Islamorada or Marathon |
| 3-day trip | 2–3 days | More time for Upper, Middle, and Lower Keys |
For a Key West day trip from Miami, leaving early is important. A same-day return means roughly seven hours of driving before adding time for attractions, meals, parking, and traffic. That leaves less time in Key West than the total length of the day might suggest.
The biggest practical issue is that there is no real alternate highway through the Keys. If an incident slows US-1, you generally cannot switch to another major route to bypass it. Check traffic and road conditions before leaving Miami, and keep your schedule flexible.
For a more relaxed Overseas Highway Florida Keys trip, two days is a useful minimum, while three days gives you considerably more time to stop along the route.
When to Make the Drive
For a Miami to Key West road trip, winter and early spring generally offer comfortable conditions, but they are also among the busiest periods in the Florida Keys. Expect more traffic and higher demand for accommodation, especially around holidays and weekends.
Late spring and summer can bring hotter temperatures and afternoon storms. June through November is Atlantic hurricane season, so check the forecast before leaving and keep your plans flexible if a tropical system is approaching.
For the Seven Mile Bridge drive, timing matters if you want daylight views. Try to cross the bridge before sunset rather than leaving the Marathon area late in the evening. There are no places to safely stop on the bridge itself, so plan any photos or viewpoints before or after the crossing.
Best overall: Visit between November and April for comfortable driving conditions, but book ahead if traveling during the busiest winter weeks.
Where to Stay Along the Way
Since the Miami to Key West road trip follows one main route, your overnight stop can shape how much of the Keys you actually see. Key Largo and Islamorada are useful for an early stop, while Marathon works well as a midpoint before continuing to Key West.
Lodging in the middle Keys is more limited than in larger Florida cities, so booking ahead is especially useful during the busier winter and spring months. If you choose an overnight trip instead of a Key West day trip from Miami, staying in Marathon can also give you more time for stops around the Seven Mile Bridge and Bahia Honda.
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For readers extending the trip, add an internal link to your Travelarii Florida Keys listings here so they can compare available properties along the route.
FAQs
The Miami to Key West road trip covers roughly 113 miles along US-1 and the Overseas Highway. With no stops and light traffic, the drive takes about 3.5 hours. In practice, plan for 4.5 to 6 hours if you want to stop in places such as Key Largo, Islamorada, Marathon, or Bahia Honda.
Yes, but it makes for a long day. The drive takes about 3.5 hours each way, so driving there and back can mean more than 7 hours on the road before adding stops. A day trip works best if Key West is your main goal. Staying overnight gives you more time for the Keys.
The Seven Mile Bridge is generally straightforward to drive, with a normal two-lane road and clear lane markings. The open-water setting can feel unusual for first-time visitors, particularly in windy weather. Stay focused on traffic, avoid stopping on the bridge, and use designated areas nearby if you want to take photos.
Marathon is one of the most practical stops because it sits around the middle of the Florida Keys. It provides access to the Seven Mile Bridge, Bahia Honda State Park, and nearby beaches. For a shorter first stop from Miami, Key Largo and Islamorada are easier choices.
No reservation is required to drive the Overseas Highway from Miami to Key West. However, reservations may be needed or strongly recommended for hotels, vacation rentals, tours, and some attractions along the route. During busy travel periods, booking your overnight stay in advance is particularly useful.
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