How far is Allentown, PA from Plainfield, PA?
The driving distance from Allentown, PA to Plainfield, PA is about 105.3 miles (169.4 km), with a travel time of about 02h 12m by car.
- The straight-line flight distance is about 98.7 miles (158.9 km).
- For a round trip, plan for roughly 04h 24m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM EDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 02h 12m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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 United States of America
Route Weather Snapshot
Check the forecast at both ends before you head out.
Driving Route Map
The map below follows the saved road route between Allentown and Plainfield.
Turn-by-Turn Driving Directions
Step-by-step road directions between Allentown and Plainfield.
-
1
Start on Tilghman Street
5 mi · 8 min · Tilghman Street
-
2
Take the ramp slight left toward US 22 West: Harrisburg
698 ft · 18 sec
-
3
Merge slight left onto Lehigh Valley Thruway
1.1 km · 54 sec · Lehigh Valley Thruway
-
4
Merge slight left onto William Penn Highway
43.1 mi · 52 min · William Penn Highway
-
5
Continue on 78th Division Highway
7.6 mi · 9 min · 78th Division Highway
-
6
Keep slight left to continue on I 81 South: Harrisburg
1.1 km · 49 sec
-
7
Merge slight left
44.2 mi · 55 min
-
8
Take the exit slight right toward PA 465: Allen Road
1223 ft · 37 sec
-
9
Turn right onto Allen Road
1.2 mi · 2 min · Allen Road
-
10
Turn left onto Newville Road
1.6 mi · 3 min · Newville Road
-
11
Continue on East Main Street
1.4 km · 2 min · East Main Street
-
12
Arrive at your destination
0 m · 1 sec · West Main Street
Car Route Details
A richer read on the saved driving route between Allentown and Plainfield.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 81 South
Merge slight left
44.2 mi · 00h 55m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Sunny leaving Allentown and Sunny near Plainfield.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Allentown to Plainfield?
The road trip is about 105.3 miles (169.4 km) and usually takes 02h 12m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Hamlin is a useful midpoint, sitting about 52.6 miles from Allentown and 52.8 miles from Plainfield.
How much longer is the road route than the straight-line distance?
The direct path is about 98.7 miles (158.9 km), while the road route adds roughly 6.6 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 8:00 AM to 10:00 AM EDT. If you want a more comfortable same-day return, try to leave by 2:06 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $15.16 one way or $30.32 round trip. Estimated CO2 is about 33 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Allentown and Sunny near Plainfield.
Stop Ideas Near Hamlin
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 Hamlin.
Elizabethtown station
Mount Joy
Middletown
Lancaster station
Flight Path Map
This map shows the direct air route between Allentown and Plainfield. Straight-line distance: 98.74 mi (158.91 km).
#1 Allentown
The third most populous city in Pennsylvania.
| Population | 121,470 |
| Coordinates | 40.6084300, -75.4901800 |
| Altitude | 103 |
| Country | United States |
#2 Plainfield
Unincorporated community in Cumberland County, Pennsylvania, United States
| Population | 6,248 |
| Coordinates | 40.2031400, -77.2899800 |
| Altitude | 151 |
| Country | United States |
End: Plainfield (-77.28998, 40.20314)
Estimated Travel Time
Distance: 169 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 03h 30m |
| 40 mph (64.37 km/h) | 02h 37m |
| 50 mph (80.47 km/h) | 02h 06m |
| 60 mph (96.56 km/h) | 01h 45m |
| 70 mph (112.65 km/h) | 01h 30m |
| 80 mph (129 km/h) | 01h 18m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $15.16 | $30.32 |
| Mid-grade | $4.60 | $17.06 | $34.12 |
| Premium | $4.95 | $18.38 | $36.76 |
| Diesel | $5.98 | $22.19 | $44.37 |
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.