How far is Allentown, PA from Saint Thomas, PA?
The driving distance from Allentown, PA to Saint Thomas, PA is about 138.9 miles (223.6 km), with a travel time of about 02h 54m by car.
- The straight-line flight distance is about 130.7 miles (210.3 km).
- For a round trip, plan for roughly 05h 49m 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 54m.
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.
Census designated place
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Mostly Sunny then Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Allentown and Saint Thomas.
Turn-by-Turn Driving Directions
Step-by-step road directions between Allentown and Saint Thomas.
-
1
Start on Tilghman Street
5 mi · 8 min · Tilghman Street
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2
Take the ramp slight left toward US 22 West: Harrisburg
698 ft · 18 sec
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3
Merge slight left onto Lehigh Valley Thruway
1.1 km · 54 sec · Lehigh Valley Thruway
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4
Merge slight left onto William Penn Highway
43.1 mi · 52 min · William Penn Highway
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5
Continue on 78th Division Highway
7.6 mi · 9 min · 78th Division Highway
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6
Keep slight left to continue on I 81 South: Harrisburg
1.1 km · 49 sec
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7
Merge slight left
72.6 mi · 1 hr 28 min
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8
Take the exit slight right toward Lincoln Way
743 ft · 18 sec
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9
Turn right onto Lincoln Way East
1.5 mi · 3 min · Lincoln Way East
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10
Keep slight right to continue on Lincoln Way East
7.4 mi · 13 min · Lincoln Way East
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11
Turn right onto Schoolhouse Road
6 m · 1 sec · Schoolhouse Road
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12
Arrive at your destination
0 m · 1 sec · Schoolhouse Road
Car Route Details
A richer read on the saved driving route between Allentown and Saint Thomas.
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
72.6 mi · 01h 28m
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.
Mostly Sunny leaving Allentown and Mostly Sunny then Chance Rain Showers near Saint Thomas.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Allentown to Saint Thomas?
The road trip is about 138.9 miles (223.6 km) and usually takes 02h 54m 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?
Skyline View is a useful midpoint, sitting about 69.3 miles from Allentown and 69.6 miles from Saint Thomas.
How much longer is the road route than the straight-line distance?
The direct path is about 130.7 miles (210.3 km), while the road route adds roughly 8.2 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 12:40 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $20.02 one way or $40.04 round trip. Estimated CO2 is about 43.5 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Allentown and Mostly Sunny then Chance Rain Showers near Saint Thomas.
Stop Ideas Near Skyline View
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 Skyline View.
Harrisburg Transportation Center
Middletown
Elizabethtown station
Mount Joy
Flight Path Map
This map shows the direct air route between Allentown and Saint Thomas. Straight-line distance: 130.69 mi (210.32 km).
#1 Allentown
The third most populous city in Pennsylvania.
| Population | 121,470 |
| Coordinates | 40.6084300, -75.4901800 |
| Altitude | 103 |
| Country | United States |
#2 Saint Thomas
Township in Franklin County, Pennsylvania
| Population | 6,039 |
| Coordinates | 39.9175900, -77.7977700 |
| Altitude | 197 |
| Country | United States |
End: Saint Thomas (-77.79777, 39.91759)
Estimated Travel Time
Distance: 224 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 04h 37m |
| 40 mph (64.37 km/h) | 03h 28m |
| 50 mph (80.47 km/h) | 02h 46m |
| 60 mph (96.56 km/h) | 02h 18m |
| 70 mph (112.65 km/h) | 01h 59m |
| 80 mph (129 km/h) | 01h 43m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $20.02 | $40.04 |
| Mid-grade | $4.60 | $22.54 | $45.07 |
| Premium | $4.95 | $24.27 | $48.55 |
| Diesel | $5.98 | $29.30 | $58.60 |
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 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.