How far is St. Petersburg, FL from Key West, FL?
The driving distance from St. Petersburg, FL to Key West, FL is about 404.9 miles (651.6 km), with a travel time of about 08h 28m by car.
- The straight-line flight distance is about 229 miles (368.6 km).
- For a round trip, plan for roughly 16h 56m 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 08h 28m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
This departure sits inside the recommended comfort window for the route.
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.
Mostly Sunny then Scattered Showers And Thunderstorms
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
Driving Route Map
The map below follows the saved road route between St. Petersburg and Key West.
Turn-by-Turn Driving Directions
Step-by-step road directions between St. Petersburg and Key West.
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1
Start on 34th Street South
15 m · 5 sec · 34th Street South
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2
Turn right onto Central Avenue
1304 ft · 51 sec · Central Avenue
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3
Turn right onto 31st Street South
1.1 km · 1 min · 31st Street South
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4
Take the ramp slight right
2760 ft · 1 min
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5
Merge slight right
4.9 mi · 6 min
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6
Keep slight left
1406 ft · 17 sec
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7
Merge slight right onto Sunshine Skyway Bridge
13.4 mi · 15 min · Sunshine Skyway Bridge
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8
Keep slight left to continue on I 75 South: Naples
1.1 mi · 2 min
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9
Merge slight left
28 mi · 30 min
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10
Keep slight left
175.7 mi · 3 hr 8 min
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11
Take the exit slight right toward US 27: Miami, South Bay
1118 ft · 21 sec
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12
Keep slight right to continue on US 27 South: Miami
2407 ft · 59 sec
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13
Merge slight left
9.2 mi · 11 min
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14
Keep slight right
8.6 mi · 11 min
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15
Take the exit right toward Florida's Turnpike South: Homestead, Key West
1324 ft · 32 sec
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16
Merge slight left onto Homestead Extension of Florida's Turnpike
34.5 mi · 41 min · Homestead Extension of Florida's Turnpike
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17
Keep slight left
2930 ft · 1 min
-
18
Merge slight left onto Dixie Highway
19.2 mi · 27 min · Dixie Highway
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19
Continue on Overseas Highway
104.2 mi · 2 hr 43 min · Overseas Highway
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20
Turn right onto North Roosevelt Boulevard
2.4 mi · 6 min · North Roosevelt Boulevard
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21
Turn left onto George Street
1845 ft · 1 min · George Street
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22
Arrive at your destination
0 m · 1 sec · George Street
Car Route Details
A richer read on the saved driving route between St. Petersburg and Key West.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
I 75 South
Keep slight left
176 mi · 03h 08m
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.
Mostly Sunny then Scattered Showers And Thunderstorms leaving St. Petersburg and Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms near Key West.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from St. Petersburg to Key West?
The road trip is about 404.9 miles (651.6 km) and usually takes 08h 28m 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 202.6 miles from St. Petersburg and 202.3 miles from Key West.
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 175.9 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 $59.27 one way or $118.55 round trip. Estimated CO2 is about 127 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny then Scattered Showers And Thunderstorms around St. Petersburg and Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms near Key West.
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 St. Petersburg and Key West. Straight-line distance: 229.04 mi (368.61 km).
#1 St. Petersburg
The second most populous city in Florida.
| Population | 253,693 |
| Coordinates | 27.7708600, -82.6792700 |
| Altitude | 13 |
| Country | United States |
#2 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 |
End: Key West (-81.78163, 24.55524)
Estimated Travel Time
Distance: 652 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 13h 29m |
| 40 mph (64.37 km/h) | 10h 07m |
| 50 mph (80.47 km/h) | 08h 05m |
| 60 mph (96.56 km/h) | 06h 44m |
| 70 mph (112.65 km/h) | 05h 47m |
| 80 mph (129 km/h) | 05h 03m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.15 | $59.27 | $118.55 |
| Mid-grade | $4.60 | $65.68 | $131.35 |
| Premium | $4.90 | $69.96 | $139.93 |
| Diesel | $4.35 | $62.16 | $124.32 |
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.