How far is Mercer, PA from Upper Darby, PA?
The driving distance from Mercer, PA to Upper Darby, PA is about 357 miles (574.6 km), with a travel time of about 06h 41m by car.
- The straight-line flight distance is about 275.6 miles (443.5 km).
- For a round trip, plan for roughly 13h 23m 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 41m.
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.
Township in southern Perry County, Pennsylvania
Route Weather Snapshot
Check the forecast at both ends before you head out.
Sunny
Driving Route Map
The map below follows the saved road route between Mercer and Upper Darby.
Turn-by-Turn Driving Directions
Step-by-step road directions between Mercer and Upper Darby.
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1
Start on Erie Street
2.2 mi · 4 min · Erie Street
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2
Continue on Perry Highway
963 ft · 24 sec · Perry Highway
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3
Take the ramp left toward I 80 East: Clarion
1120 ft · 27 sec
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4
Merge slight left onto Keystone Shortway
261.1 mi · 4 hr 43 min · Keystone Shortway
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5
Take the exit slight right toward PA 940, PATP, I 476: Wilkes-Barre, Allentown
1.1 km · 1 min
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6
Keep slight left
1217 ft · 32 sec
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7
Keep slight right to continue on I 476 South: Allentown
1303 ft · 32 sec
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8
Merge slight left onto Pennsylvania Turnpike Northeast Extension
74.6 mi · 1 hr 21 min · Pennsylvania Turnpike Northeast Extension
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9
Continue on Pennsylvania Turnpike Northeast Extension
1558 ft · 24 sec · Pennsylvania Turnpike Northeast Extension
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10
Keep slight left to continue on Pennsylvania Turnpike Northeast Extension
1179 ft · 18 sec · Pennsylvania Turnpike Northeast Extension
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11
Continue on Mid-County Expressway
10.8 mi · 15 min · Mid-County Expressway
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12
Take the exit slight right toward PA 3: Upper Darby, Broomall
1670 ft · 59 sec
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13
Turn left onto West Chester Pike
2.5 mi · 5 min · West Chester Pike
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14
Turn slight right onto Darby Road
144 m · 16 sec · Darby Road
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15
Continue on Lansdowne Avenue
3 mi · 8 min · Lansdowne Avenue
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16
Turn right onto West Providence Road
1430 ft · 39 sec · West Providence Road
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17
Arrive at your destination
0 m · 1 sec · West Providence Road
Car Route Details
A richer read on the saved driving route between Mercer and Upper Darby.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Keystone Shortway
Merge slight left onto Keystone Shortway
261 mi · 04h 43m
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.
Sunny leaving Mercer and Sunny near Upper Darby.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Mercer to Upper Darby?
The road trip is about 357 miles (574.6 km) and usually takes 06h 41m 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?
Carroll is a useful midpoint, sitting about 178.3 miles from Mercer and 178.8 miles from Upper Darby.
How much longer is the road route than the straight-line distance?
The direct path is about 275.6 miles (443.5 km), while the road route adds roughly 81.4 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 $51.48 one way or $102.97 round trip. Estimated CO2 is about 112 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Mercer and Sunny near Upper Darby.
Stop Ideas Near Carroll
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 Carroll.
Lewistown
Harrisburg Transportation Center
Huntingdon
Tyrone
Flight Path Map
This map shows the direct air route between Mercer and Upper Darby. Straight-line distance: 275.57 mi (443.48 km).
#1 Mercer
Borough in Mercer County, Pennsylvania, United States
| Population | 1,865 |
| Coordinates | 41.2270000, -80.2397900 |
| Altitude | 395 |
| Country | United States |
#2 Upper Darby
Town in Delaware County, Pennsylvania, United States
| Population | 82,883 |
| Coordinates | 39.9284500, -75.2738000 |
| Altitude | 20 |
| Country | United States |
End: Upper Darby (-75.2738, 39.92845)
Estimated Travel Time
Distance: 575 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 11h 53m |
| 40 mph (64.37 km/h) | 08h 55m |
| 50 mph (80.47 km/h) | 07h 08m |
| 60 mph (96.56 km/h) | 05h 57m |
| 70 mph (112.65 km/h) | 05h 06m |
| 80 mph (129 km/h) | 04h 27m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $51.48 | $102.97 |
| Mid-grade | $4.60 | $57.95 | $115.89 |
| Premium | $4.95 | $62.42 | $124.84 |
| Diesel | $5.98 | $75.35 | $150.70 |
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.