How far is Key Largo, FL from St. Petersburg, FL?
The driving distance from Key Largo, FL to St. Petersburg, FL is about 308.4 miles (496.4 km), with a travel time of about 04h 50m by car.
- The straight-line flight distance is about 231.2 miles (372.1 km).
- For a round trip, plan for roughly 09h 40m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM EDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 04h 50m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Census designated place
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Rain Showers
Partly Cloudy
Driving Route Map
The map below follows the saved road route between Key Largo and St. Petersburg.
Turn-by-Turn Driving Directions
Step-by-step road directions between Key Largo and St. Petersburg.
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1
Start on Harbor Drive
94 m · 16 sec · Harbor Drive
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2
Turn right onto Overseas Highway
9.3 mi · 16 min · Overseas Highway
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3
Continue on Dixie Highway
19.4 mi · 27 min · Dixie Highway
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4
Take the exit slight right toward Miami, Orlando, Florida's Turnpike North
1785 ft · 38 sec
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5
Continue on Homestead Extension of Florida's Turnpike
13.2 mi · 16 min · Homestead Extension of Florida's Turnpike
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6
Keep slight right to continue on Homestead Extension of Florida's Turnpike
3.6 mi · 5 min · Homestead Extension of Florida's Turnpike
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7
Keep slight left to continue on Homestead Extension of Florida's Turnpike
2.5 mi · 3 min · Homestead Extension of Florida's Turnpike
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8
Keep slight right to continue on Homestead Extension of Florida's Turnpike
15.5 mi · 18 min · Homestead Extension of Florida's Turnpike
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9
Take the exit slight right toward US 27: Okeechobee Road
1140 ft · 28 sec
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10
Keep slight right to continue on US 27: Okeechobee Road
633 ft · 16 sec
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11
Merge slight left onto Okeechobee Road
17.6 mi · 23 min · Okeechobee Road
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12
Take the exit slight right toward I 75: Miami, Fort Lauderdale, Naples
1360 ft · 33 sec
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13
Keep slight left to continue on I 75 North: Naples
1.3 km · 2 min
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14
Merge slight left onto Alligator Alley
203.5 mi · 3 hr 38 min · Alligator Alley
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15
Take the exit slight right toward I 275 North: Saint Petersburg
5.7 mi · 8 min
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16
Keep slight left
1610 ft · 20 sec
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17
Merge slight right onto Sunshine Skyway Bridge
14.3 mi · 17 min · Sunshine Skyway Bridge
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18
Take the exit slight left toward 31st Street South
1604 ft · 39 sec
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19
Keep slight left to continue on Winery, Treasure Island, Tropicana Field
49 m · 10 sec
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20
Turn left onto 31st Street South
2167 ft · 58 sec · 31st Street South
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21
Turn left onto 5th Avenue South
1303 ft · 40 sec · 5th Avenue South
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22
Turn right onto 34th Street South
1589 ft · 41 sec · 34th Street South
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23
Arrive at your destination
0 m · 1 sec · 34th Street South
Car Route Details
A richer read on the saved driving route between Key Largo and St. Petersburg.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Alligator Alley
Merge slight left onto Alligator Alley
203 mi · 03h 38m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Slight Chance Rain Showers leaving Key Largo and Partly Cloudy near St. Petersburg.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Key Largo to St. Petersburg?
The road trip is about 308.4 miles (496.4 km) and usually takes 04h 50m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Golden Gate is a useful midpoint, sitting about 154.2 miles from Key Largo and 154.2 miles from St. Petersburg.
How much longer is the road route than the straight-line distance?
The direct path is about 231.2 miles (372.1 km), while the road route adds roughly 77.2 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM EDT. If you want a more comfortable same-day return, try to leave by 7:20 AM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $45.13 one way or $90.26 round trip. Estimated CO2 is about 96.7 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Rain Showers around Key Largo and Partly Cloudy near St. Petersburg.
Stop Ideas Near Golden Gate
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Golden Gate.
Fort Myers, Florida
Port Charlotte, Florida
Flight Path Map
This map shows the direct air route between Key Largo and St. Petersburg. Straight-line distance: 231.22 mi (372.12 km).
#1 Key Largo
Census designated place in Florida, United States
| Population | 10,433 |
| Coordinates | 25.0865200, -80.4472800 |
| Altitude | 2 |
| Country | United States |
#2 St. Petersburg
The second most populous city in Florida.
| Population | 253,693 |
| Coordinates | 27.7708600, -82.6792700 |
| Altitude | 13 |
| Country | United States |
End: US 19 (-82.679372, 27.77086)
Estimated Travel Time
Distance: 496 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 10h 16m |
| 40 mph (64.37 km/h) | 07h 42m |
| 50 mph (80.47 km/h) | 06h 10m |
| 60 mph (96.56 km/h) | 05h 08m |
| 70 mph (112.65 km/h) | 04h 24m |
| 80 mph (129 km/h) | 03h 50m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.15 | $45.13 | $90.26 |
| Mid-grade | $4.60 | $50.00 | $100.01 |
| Premium | $4.90 | $53.27 | $106.54 |
| Diesel | $4.35 | $47.33 | $94.66 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Florida · May 07, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.