The fastest way from MIA to Marathon is by private shuttle or car rental, taking about 2.5 hours. The most affordable method is the Miami-Dade Transit bus system, costing roughly $9.00 per person total for the multi-leg trip.
| Mode | Est. Cost | Time | Best For… |
|---|---|---|---|
| Rental Car | $50-$120/day | 2.5 hrs | Exploration |
| Private Shuttle | $130+ | 2.25 hrs | Direct Comfort |
| Bus (Flix/Grey) | $21-$45 | 3 hrs | Budget Solo |
| Group Shuttle | $575+ (8 pax) | 2.5 hrs | Large Families |
Professional Shuttle Services
For travelers who want to skip Miami traffic and head straight to their vacation rental, professional shuttles offer the most convenience.
- Individual Rates: Expect to pay approximately $130.00 one-way for an individual shuttle from MIA to Marathon.
- Group Savings: Executive shuttles for groups of 6–10 people average around $400.00 total, significantly lowering the per-person cost to about $40.00–$65.00.
- Key Benefit: Most private services operate 24/7 by reservation, meeting you directly at the airport baggage claim.
Car Rentals at MIA
Renting a car provides the freedom to explore Middle Keys landmarks like Sombrero Beach at your own pace.
- Average Rates: While “Good Deal” rates can be as low as $31.00 to $53.00 per day for compact cars, the average daily price in 2026 is closer to $156.00 during peak periods.
- Cheapest Months: Plan your visit in January or August for the lowest rental car inventory pricing.
The Budget Route (Public Transit)
You can reach Marathon for under $10 by linking Miami-Dade and Monroe County transit systems:
- Step 1: Take the Metrobus ($2.25) or a regional express to Florida City.
- Step 2: Transfer to the 301 Dade-Monroe Express ($2.65).
- Step 3: Once in the Keys, the Lower Keys Shuttle can transport you between Marathon and Key West for $4.00 each way.
Frequently Asked Questions
What is the fastest way to get from Miami Airport to Marathon? The fastest way is by car or private shuttle via the Florida Turnpike and US-1 South, typically taking 2 hours and 30 minutes depending on traffic at the “18-Mile Stretch”.
Is there a direct train from Miami to the Florida Keys? No, there is no train service to the Florida Keys. Travelers must use the Overseas Highway (US-1) via bus, shuttle, or car.
How much does a shuttle cost for a family of four? A private group shuttle for up to five passengers typically costs $350.00 total ($87.50 per person), which includes door-to-door service to your Marathon destination.
