How far is Key West, FL from St. Petersburg, FL?
The driving distance from Key West, FL to St. Petersburg, FL is about 409.9 miles (659.7 km), with a travel time of about 06h 48m by car.
- The straight-line flight distance is about 229 miles (368.6 km).
- For a round trip, plan for roughly 13h 36m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 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 06h 48m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
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.
A city in Broward County, Florida.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
Mostly Sunny then Scattered Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between Key West and St. Petersburg.
Turn-by-Turn Driving Directions
Step-by-step road directions between Key West and St. Petersburg.
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1
Start on George Street
112 m · 21 sec · George Street
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2
At the end of the road, turn left onto Flagler Avenue
2.1 mi · 5 min · Flagler Avenue
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3
At the end of the road, turn left onto South Roosevelt Boulevard
1367 ft · 41 sec · South Roosevelt Boulevard
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4
Turn right onto Overseas Highway
36.1 mi · 57 min · Overseas Highway
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5
Continue on New Seven Mile Bridge
68.1 mi · 1 hr 46 min · New Seven Mile Bridge
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6
Continue on Dixie Highway
19.4 mi · 27 min · Dixie Highway
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7
Take the exit slight right toward Miami, Orlando, Florida's Turnpike North
1785 ft · 38 sec
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8
Continue on Homestead Extension of Florida's Turnpike
13.2 mi · 16 min · Homestead Extension of Florida's Turnpike
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9
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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10
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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11
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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12
Take the exit slight right toward US 27: Okeechobee Road
1140 ft · 28 sec
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13
Keep slight right to continue on US 27: Okeechobee Road
633 ft · 16 sec
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14
Merge slight left onto Okeechobee Road
17.6 mi · 23 min · Okeechobee Road
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15
Take the exit slight right toward I 75: Miami, Fort Lauderdale, Naples
1360 ft · 33 sec
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16
Keep slight left to continue on I 75 North: Naples
1.3 km · 2 min
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17
Merge slight left onto Alligator Alley
203.5 mi · 3 hr 38 min · Alligator Alley
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18
Take the exit slight right toward I 275 North: Saint Petersburg
5.7 mi · 8 min
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19
Keep slight left
1610 ft · 20 sec
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20
Merge slight right onto Sunshine Skyway Bridge
14.3 mi · 17 min · Sunshine Skyway Bridge
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21
Take the exit slight left toward 31st Street South
1604 ft · 39 sec
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22
Keep slight left to continue on Winery, Treasure Island, Tropicana Field
49 m · 10 sec
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23
Turn left onto 31st Street South
2167 ft · 58 sec · 31st Street South
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24
Turn left onto 5th Avenue South
1303 ft · 40 sec · 5th Avenue South
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25
Turn right onto 34th Street South
1589 ft · 41 sec · 34th Street South
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26
Arrive at your destination
0 m · 1 sec · 34th Street South
Car Route Details
A richer read on the saved driving route between Key West 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.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms leaving Key West and Mostly Sunny then Scattered Showers And Thunderstorms near St. Petersburg.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Key West to St. Petersburg?
The road trip is about 409.9 miles (659.7 km) and usually takes 06h 48m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
Weston is a useful midpoint, sitting about 202.8 miles from Key West and 207.1 miles from St. Petersburg.
How much longer is the road route than the straight-line distance?
The direct path is about 229 miles (368.6 km), while the road route adds roughly 180.9 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 7:30 AM EDT. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $59.98 one way or $119.96 round trip. Estimated CO2 is about 128.5 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms around Key West and Mostly Sunny then Scattered Showers And Thunderstorms near St. Petersburg.
Stop Ideas Near Weston
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 Weston.
Fort Lauderdale
Hollywood
Miami Intermodal Center
Deerfield Beach
Flight Path Map
This map shows the direct air route between Key West and St. Petersburg. Straight-line distance: 229.04 mi (368.61 km).
#1 Key West
County seat city of Monroe County, Florida, United States; island in Florida Keys
| Population | 23,767 |
| Coordinates | 24.5552400, -81.7816300 |
| Altitude | 1 |
| 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: 660 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 13h 39m |
| 40 mph (64.37 km/h) | 10h 14m |
| 50 mph (80.47 km/h) | 08h 11m |
| 60 mph (96.56 km/h) | 06h 49m |
| 70 mph (112.65 km/h) | 05h 51m |
| 80 mph (129 km/h) | 05h 06m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.15 | $59.98 | $119.96 |
| Mid-grade | $4.60 | $66.46 | $132.92 |
| Premium | $4.90 | $70.80 | $141.59 |
| Diesel | $4.35 | $62.90 | $125.80 |
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 26, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.