How far is Erie, PA from Mercersburg, PA?
The driving distance from Erie, PA to Mercersburg, PA is about 271.5 miles (436.9 km), with a travel time of about 05h 17m by car.
- The straight-line flight distance is about 195.5 miles (314.7 km).
- For a round trip, plan for roughly 10h 35m 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 17m.
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.
Human settlement in Pennsylvania, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Slight Chance Rain Showers then Mostly Sunny
Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Erie and Mercersburg.
Turn-by-Turn Driving Directions
Step-by-step road directions between Erie and Mercersburg.
-
1
Start on State Street
2318 ft · 2 min · State Street
-
2
Turn right onto West 12th Street
2 mi · 4 min · West 12th Street
-
3
Turn right onto Greengarden Boulevard
583 ft · 23 sec · Greengarden Boulevard
-
4
Turn left onto West Bayfront Parkway
862 ft · 20 sec · West Bayfront Parkway
-
5
Continue on Raymond P Shafer Highway
104 mi · 1 hr 52 min · Raymond P Shafer Highway
-
6
Take the exit slight right toward Cranberry, Pennsylvania Turnpike
2944 ft · 1 min
-
7
Keep slight left to continue on Youngstown Ohio, Harrisburg
1.2 km · 2 min
-
8
Keep slight right to continue on I 76, PATP: Youngstown Ohio, Harrisburg
2328 ft · 57 sec
-
9
Keep slight left to continue on I 76 East: Harrisburg
1861 ft · 1 min
-
10
Merge slight left onto Pennsylvania Turnpike
133.2 mi · 2 hr 25 min · Pennsylvania Turnpike
-
11
Take the exit slight right toward US 30: Breezewood, Baltimore, Washington DC
1.9 mi · 4 min
-
12
Keep slight right to continue on US 30 East: Chambersburg, Gettysburg
1079 ft · 47 sec
-
13
Merge slight left onto Lincoln Highway
15 mi · 21 min · Lincoln Highway
-
14
Turn left onto Lincoln Way West
2.6 mi · 5 min · Lincoln Way West
-
15
Turn slight right onto Buchanan Trail
9.1 mi · 16 min · Buchanan Trail
-
16
Continue on North Main Street
3001 ft · 2 min · North Main Street
-
17
Turn left onto East Seminary Street
71 m · 15 sec · East Seminary Street
-
18
Turn right onto JEB Stuart Alley
38 m · 9 sec · JEB Stuart Alley
-
19
Arrive at your destination
0 m · 1 sec · JEB Stuart Alley
Car Route Details
A richer read on the saved driving route between Erie and Mercersburg.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
Pennsylvania Turnpike
Merge slight left onto Pennsylvania Turnpike
133 mi · 02h 25m
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.
Slight Chance Rain Showers then Mostly Sunny leaving Erie and Chance Rain Showers near Mercersburg.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Erie to Mercersburg?
The road trip is about 271.5 miles (436.9 km) and usually takes 05h 17m 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?
Center is a useful midpoint, sitting about 135.7 miles from Erie and 135.8 miles from Mercersburg.
How much longer is the road route than the straight-line distance?
The direct path is about 195.5 miles (314.7 km), while the road route adds roughly 76 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 6:24 AM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $39.14 one way or $78.29 round trip. Estimated CO2 is about 85.1 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Rain Showers then Mostly Sunny around Erie and Chance Rain Showers near Mercersburg.
Stop Ideas Near Center
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 Center.
Union Station
Greensburg
Latrobe station
Connellsville station
Flight Path Map
This map shows the direct air route between Erie and Mercersburg. Straight-line distance: 195.52 mi (314.66 km).
#1 Erie
The second most populous city in Pennsylvania.
| Population | 95,077 |
| Coordinates | 42.1292200, -80.0850600 |
| Altitude | 199 |
| Country | United States |
#2 Mercersburg
Borough of Pennsylvania
| Population | 1,527 |
| Coordinates | 39.8278700, -77.9033300 |
| Altitude | 173 |
| Country | United States |
End: Mercersburg (-77.90333, 39.82787)
Estimated Travel Time
Distance: 437 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 09h 02m |
| 40 mph (64.37 km/h) | 06h 47m |
| 50 mph (80.47 km/h) | 05h 25m |
| 60 mph (96.56 km/h) | 04h 31m |
| 70 mph (112.65 km/h) | 03h 52m |
| 80 mph (129 km/h) | 03h 23m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $39.14 | $78.29 |
| Mid-grade | $4.60 | $44.06 | $88.12 |
| Premium | $4.95 | $47.46 | $94.92 |
| Diesel | $5.98 | $57.29 | $114.58 |
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.