How far is Mercer, PA from Philadelphia, PA?
The driving distance from Mercer, PA to Philadelphia, PA is about 338.6 miles (545 km), with a travel time of about 05h 43m by car.
- The straight-line flight distance is about 280.5 miles (451.4 km).
- For a round trip, plan for roughly 11h 26m 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 05h 43m.
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.
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 Philadelphia.
Turn-by-Turn Driving Directions
Step-by-step road directions between Mercer and Philadelphia.
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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
3.4 mi · 5 min · Mid-County Expressway
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12
Take the exit slight right toward I 76 East, I 76 West: Philadelphia, Valley Forge
1758 ft · 43 sec
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13
Keep slight left to continue on I 76 East: Philadelphia
1722 ft · 42 sec
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14
Merge slight right onto Schuylkill Expressway
12.6 mi · 18 min · Schuylkill Expressway
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15
Keep slight left to continue on Vine Street Expressway
1.3 km · 1 min · Vine Street Expressway
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16
Take the exit slight right toward Central Philadelphia
731 ft · 18 sec
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17
Keep slight right to continue on 15th Street, Central Philadelphia
96 m · 11 sec
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18
Turn right onto North 15th Street
1987 ft · 49 sec · North 15th Street
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19
Turn slight left onto South Penn Square
115 m · 9 sec · South Penn Square
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20
Keep slight left to continue on South Penn Square
51 m · 3 sec · South Penn Square
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21
Arrive at your destination
0 m · 1 sec · South Penn Square
Car Route Details
A richer read on the saved driving route between Mercer and Philadelphia.
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.
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.
Sunny leaving Mercer and Sunny near Philadelphia.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Mercer to Philadelphia?
The road trip is about 338.6 miles (545 km) and usually takes 05h 43m 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?
Carroll is a useful midpoint, sitting about 178.8 miles from Mercer and 159.8 miles from Philadelphia.
How much longer is the road route than the straight-line distance?
The direct path is about 280.5 miles (451.4 km), while the road route adds roughly 58.1 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 5:34 AM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $48.83 one way or $97.66 round trip. Estimated CO2 is about 106.2 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Mercer and Sunny near Philadelphia.
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 Philadelphia. Straight-line distance: 280.46 mi (451.36 km).
#1 Mercer
Borough in Mercer County, Pennsylvania, United States
| Population | 1,865 |
| Coordinates | 41.2270000, -80.2397900 |
| Altitude | 395 |
| Country | United States |
#2 Philadelphia
The sixth most populous city in the United States and the center of the Philadelphia metropolitan area.
| Population | 1,578,487 |
| Coordinates | 39.9523300, -75.1637900 |
| Altitude | 12 |
| Country | United States |
End: South Penn Square (-75.163922, 39.951648)
Estimated Travel Time
Distance: 545 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 11h 16m |
| 40 mph (64.37 km/h) | 08h 27m |
| 50 mph (80.47 km/h) | 06h 46m |
| 60 mph (96.56 km/h) | 05h 38m |
| 70 mph (112.65 km/h) | 04h 50m |
| 80 mph (129 km/h) | 04h 13m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $48.83 | $97.66 |
| Mid-grade | $4.60 | $54.96 | $109.92 |
| Premium | $4.95 | $59.20 | $118.40 |
| Diesel | $5.98 | $71.46 | $142.92 |
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.