How far is Upper Darby, PA from King of Prussia, PA?
The driving distance from Upper Darby, PA to King of Prussia, PA is about 18.2 miles (29.3 km), with a travel time of about 00h 32m by car.
- The straight-line flight distance is about 12.9 miles (20.7 km).
- For a round trip, plan for roughly 01h 04m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM EDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
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 00h 32m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
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.
Unincorporated community in Radnor Township, Pennsylvania, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Clear
Sunny
Driving Route Map
The map below follows the saved road route between Upper Darby and King of Prussia.
Turn-by-Turn Driving Directions
Step-by-step road directions between Upper Darby and King of Prussia.
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1
Start on West Providence Road
1430 ft · 46 sec · West Providence Road
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2
Turn left onto South Lansdowne Avenue
3 mi · 8 min · South Lansdowne Avenue
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3
Continue on Darby Road
144 m · 14 sec · Darby Road
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4
Turn slight left onto West Chester Pike
2.2 mi · 5 min · West Chester Pike
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5
Take the exit slight right toward I 476 North: Plymouth Meeting
2005 ft · 59 sec
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6
Merge slight left onto Mid-County Expressway
7 mi · 10 min · Mid-County Expressway
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7
Take the exit slight right toward I 76 West: Valley Forge
2184 ft · 53 sec
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8
Merge slight left onto Schuylkill Expressway
3.7 mi · 5 min · Schuylkill Expressway
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9
Take the exit slight right toward US 202, US 422 West: King of Prussia, West Chester, Pottstown
632 ft · 10 sec
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10
Keep slight left to continue on US 202 South, US 422 West: Mall Boulevard, West Chester, Pottstown, Swedesford Road
1447 ft · 22 sec
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11
Keep slight left to continue on Mall Boulevard
1331 ft · 21 sec
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12
Keep slight right to continue on Mall Boulevard
1891 ft · 1 min
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13
At the end of the road, turn left
29 m · 7 sec
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14
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Upper Darby and King of Prussia.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
Mid-County Expressway
Merge slight left onto Mid-County Expressway
7.05 mi · 00h 10m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Mostly Clear leaving Upper Darby and Sunny near King of Prussia.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Upper Darby to King of Prussia?
The road trip is about 18.2 miles (29.3 km) and usually takes 00h 32m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Radnor is a useful midpoint, sitting about 9.1 miles from Upper Darby and 9.1 miles from King of Prussia.
How much longer is the road route than the straight-line distance?
The direct path is about 12.9 miles (20.7 km), while the road route adds roughly 5.3 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 7:00 AM to 7:00 PM EDT. If you want a more comfortable same-day return, try to leave by 7:26 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $2.62 one way or $5.23 round trip. Estimated CO2 is about 5.7 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Clear around Upper Darby and Sunny near King of Prussia.
Stop Ideas Near Radnor
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Bluestone Lane City Hall Coffee Shop
Dilworth Park
Philadelphia Marriage License
City Hall
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Radnor.
Ardmore
Paoli
North Philadelphia station
30th Street Station
Flight Path Map
This map shows the direct air route between Upper Darby and King of Prussia. Straight-line distance: 12.86 mi (20.69 km).
#1 Upper Darby
Town in Delaware County, Pennsylvania, United States
| Population | 82,883 |
| Coordinates | 39.9284500, -75.2738000 |
| Altitude | 20 |
| Country | United States |
#2 King of Prussia
Census-designated place in Montgomery County, Pennsylvania, United States
| Population | 19,936 |
| Coordinates | 40.0892700, -75.3960200 |
| Altitude | 61 |
| Country | United States |
End: King of Prussia (-75.39602, 40.08927)
Estimated Travel Time
Distance: 29 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 36m |
| 40 mph (64.37 km/h) | 00h 27m |
| 50 mph (80.47 km/h) | 00h 21m |
| 60 mph (96.56 km/h) | 00h 18m |
| 70 mph (112.65 km/h) | 00h 15m |
| 80 mph (129 km/h) | 00h 13m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $2.62 | $5.23 |
| Mid-grade | $4.60 | $2.94 | $5.89 |
| Premium | $4.95 | $3.17 | $6.34 |
| Diesel | $5.98 | $3.83 | $7.65 |
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 Pennsylvania · Apr 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.