Unity, PA to Allentown, PA is 272.6 miles and takes about 5h 21m via Pennsylvania Turnpike, with a fuel budget near $49 and enough daylight to finish in a day. This trip stays within Pennsylvania, moving from the Northeast region to the Northeast region. With over two-thirds of the drive on highways, expect a fairly direct path. Given the modest distance and duration, this is a straightforward one-day excursion.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
136.3 miles from Unity, PA
A natural place for your longest stop of the day
, about 2h 37m into the drive
.
Main Roads
Road
Distance
Duration
Pennsylvania Turnpike
170.5 mi
3h 7m
William Penn Highway
42.8 mi
50m
American Legion Memorial Highway
22.5 mi
27m
I 81
12.7 mi
15m
78th Division Highway
7.6 mi
8m
Tilghman Street
4.9 mi
8m
Center Road
2.1 mi
4m
Unity Trestle Road
1.5 mi
3m
Longest stretch:
Pennsylvania Turnpike
— 170.5 mi, about 3h 7m
Traffic on I-81
Hour-of-day weekday pattern from 56 FHWA count stations on your route.
Peak
4 PM
~2,785 veh/hr typical
Quietest
1 AM
~380 veh/hr
Peak-to-quiet ratio
7.3×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Unity, PA and Allentown, PA.
1
Start on Perry Street
19 ft·3 sec·Perry Street
2
Turn right onto East Alley
0.2 mi·50 sec·East Alley
3
At end of road, turn left onto Unity Trestle Road
1.5 mi·3 min·Unity Trestle Road
4
Turn right onto PA 380; Orange Belt
0.1 mi·18 sec·Saltsburg Road
5
At end of road, turn left onto Orange Belt
2.1 mi·4 min·Center Road
6
Turn slight left onto Orange Belt
0.8 mi·1 min·Orange Belt
7
Continue on PA 48; Orange Belt
0.4 mi·51 sec·Mosside Boulevard
Use the straight / right lanes.
8
Turn sharp left onto Daugherty Drive
183 ft·12 sec·Daugherty Drive
9
Turn right
421 ft·36 sec
10
Take the ramp
0.2 mi·30 sec
11
Keep slight right at fork
0.2 mi·29 sec
Toward I 76 East: HarrisburgUse the slight right lane.
12
Merge onto I 76; PATP
170 mi·3 hr 7 min·Pennsylvania Turnpike
13
Take the exit
0.9 mi·2 min
Toward I 81, US 11: Carlisle, HarrisburgUse the slight right lane.
14
Keep slight left at fork
0.3 mi·54 sec
Toward US 11 North: HarrisburgUse the straight / slight right lanes.
15
Continue on US 11
1.1 mi·2 min·Harrisburg Pike
Use the straight lane.
16
Take the exit
0.3 mi·34 sec
Toward I 81 North: Harrisburg
17
Merge onto I 81
13 mi·15 min·I 81
Use the straight / right lanes.
18
Take the exit
0.2 mi·14 sec
Toward US 11, US 15: Enola, Marysville
19
Keep slight left at fork
0.3 mi·28 sec
Toward US 11 North, US 15 North: Marysville
20
Keep slight left at fork
0.4 mi·32 sec
21
Merge onto I 81
0.7 mi·1 min·George N. Wade Memorial Bridge
Use the straight / slight right lanes.
22
Continue on I 81
3.4 mi·4 min·American Legion Memorial Highway
23
Keep slight left at fork onto I 81
19 mi·22 min·American Legion Memorial Highway
Use the straight / slight right lanes.
24
Take the exit
0.7 mi·45 sec
Exit 89Toward I 78 East: Allentown
25
Continue on I 78
7.6 mi·8 min·78th Division Highway
26
Continue on I 78; US 22
43 mi·50 min·William Penn Highway
Use the straight lane.
27
Keep slight right at fork onto US 22
1.0 mi·1 min·Lehigh Valley Thruway
Exit 51Toward US 22 East: Pennsylvania Turnpike, LVI AirportUse the slight right lane.
28
Take the exit
0.2 mi·26 sec
Toward CetroniaUse the slight right lane.
29
Turn straight onto Tilghman Street
4.9 mi·8 min·Tilghman Street
Use the straight lane.
30
Arrive at destination
Tilghman Street
Trip Plan
For this 5-hour drive, leaving in the morning is your best bet to maximize daylight. You'll only need about one stop to break up the 272.6 miles. Keep an eye on your fuel gauge, especially during the 170.5-mile stretch on the Pennsylvania Turnpike, as services can be spaced out. The $49 fuel estimate is helpful for budgeting. Since this is a single-day trip, you have the flexibility to depart a bit later if needed, but an early start ensures a relaxed arrival in Allentown.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 136.3 miles from Unity, PA, or about 2h 37m into the drive.
The longest continuous stretch on this route runs about 170.5 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 60 miles or 1h 13m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 136.3 miles or 2h 37m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 4h 20m
Traffic, exits, and arrival timing usually matter more near Allentown, PA than in the middle of the route.
Before You Leave
+
Open the route before leaving Unity, PA so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Unity, PA
This is one driving day of about 272.6 miles and 5h 21m.
Your first comfortable stop window is around 60 miles from Unity, PA.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on Pennsylvania Turnpike for about 170.5 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 21
5 decision points cluster between mile 5.4 and 266.5 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
8
5.4 mi into trip|~12m in
Keep slight right at fork toward I 76 East: Harrisburg
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
Toward I 76 East: Harrisburg
7
176 mi into trip|~3h 20m in
Take the exit toward I 81, US 11: Carlisle, Harrisburg
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Toward I 81, US 11: Carlisle, Harrisburg
7
176.9 mi into trip|~3h 22m in
Keep slight left at fork toward US 11 North: Harrisburg
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward US 11 North: Harrisburg
6
191.4 mi into trip|~3h 41m in
Keep slight left at fork toward US 11 North, US 15 North: Marysville
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward US 11 North, US 15 North: Marysville
9
266.5 mi into trip|~5h 12m in|US 22 / Lehigh Valley Thruway
Keep slight right at fork onto US 22 / Lehigh Valley Thruway toward US 22 East: Pennsylvania Turnpike, LVI Airport
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 51
Toward US 22 East: Pennsylvania Turnpike, LVI A...
Fuel & Cost
Regular Gas
$43.47 one way
$86.93 round trip
$4.05/gal25.4 MPG avg95 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.48
$48.10
$96.20
premium
$4.81
$51.60
$103.20
diesel
$4.80
$51.47
$102.94
Estimated Tolls: $22.23
Pennsylvania Turnpike
(170.5 mi)$22.16
Lehigh Valley Thruway
(1 mi)$0.07
Toll estimates based on average 2024-2025 rates. EZ-Pass/SunPass discounts may lower the actual cost.
Estimated Trip Cost (one way, 1 person)
Fuel
$43
Tolls
$22
Meals
$25–$50
Total
$91–$116
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 95.4 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $29 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
81.8
1
$28.62
$13.08
Efficient EV
68.2
0
$23.85
$10.90
EV Truck/SUV
109
1
$38.16
$17.45
Gas CO2
95 kg
EV CO2
32 kg (66% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Jul 18, 2026
Origin
Unity, PA
Morning
in Unity on Monday
Local time
8:12 AM
EDT
Current temp
68°F
Smoke
SE 1 to 7 mph45% chanceLive forecast
Flood Watch
Flood Watch issued July 17 at 9:35PM EDT until July 19 at 2:00AM EDT by NWS Mount Holly NJ
Beach Hazards Statement
Beach Hazards Statement issued July 17 at 9:22PM EDT until July 18 at 8:00PM EDT by NWS Cleveland OH
Destination
Allentown, PA
Morning
in Allentown on Monday
Local time
8:12 AM
EDT
Current temp
67°F
Smoke
0 mph5% chanceLive forecast
Flood Watch
Flood Watch issued July 17 at 9:35PM EDT until July 19 at 2:00AM EDT by NWS Mount Holly NJ
Beach Hazards Statement
Beach Hazards Statement issued July 17 at 9:22PM EDT until July 18 at 8:00PM EDT by NWS Cleveland OH
82°F
Martinsburg, PA
136 mi in
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
1 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
5h 21m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Carlisle Federal Indian Boarding School National Monument
National Monument
More than 7,800 children from 140 Tribes went to the Carlisle School from 1879 to 1918. The National Park Service will collaborate with families, affiliated Tribal Nations, the US Army, historians, an...
3 mi from route
~8 min detour
Free
near mile 178.6
The Appalachian Trail is a 2,190+ mile long public footpath that traverses the scenic, wooded, pastoral, wild, and culturally resonant lands of the Appalachian Mountains. Conceived in 1921, built by p...
4 mi from route
~11 min detour
Free
near mile 216.2
On Tuesday morning, September 11, 2001, the U.S. came under attack when four commercial airliners were hijacked and used to strike targets on the ground. Nearly 3,000 people tragically lost their live...
7 mi from route
~16 min detour
Free
near mile 65.8
The battle at Fort Necessity in the summer of 1754 was the opening action of the French and Indian War. This war was a clash of British, French and American Indian cultures. It ended with the removal...
24 mi from route
~60 min detour
Free
near mile 37.6
The South Fork Dam failed on Friday, May 31, 1889, and unleashed 20,000,000 tons of water that devastated Johnstown, PA. The flood killed 2,209 people but it brought the nation and the world together...
24 mi from route
~59 min detour
Free
near mile 84.6
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route is 67% highway, meaning you'll spend a significant portion of your time on major interstates. The longest continuous stretch on a highway is 170.5 miles, all on the Pennsylvania Turnpike. After leaving the turnpike, you'll transition to surface roads like William Penn Highway and American Legion Memorial Highway, so be prepared for more local traffic and potentially more exits as you approach your destination.
67% highway — fuel and pacing are the main things to plan.
30 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 170.5 mi on Pennsylvania Turnpike.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on Pennsylvania Turnpike and William Penn Highway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 5.4 miles in.
Driving Effort9/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 21 significant decision points across 272.6 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 5.4 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 176 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 176.9 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Elevation Profile
Gently rolling terrain
2,126 ft346 ft
Total Climb
2,176 ft
Total Descent
2,797 ft
Highest Point
2,126 ft
~58.5 mi in
Elevation Range
1,780 ft
Notable High Points
1,841 ft at ~117 miles+755 ft prominence
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Unity, PA and Allentown, PA, road signs point toward Harrisburg and Marysville.
Allentown is the largest city in the Lehigh Valley region of eastern Pennsylvania, the county seat and largest city in Lehigh County, and the third-largest city in Pennsylvania after Philadelphia and Pittsburgh with a population of 125,845 as of 2020.
Top landmarks
•Albertus L. Meyers Bridge — bridge in United States of America
•Allentown Masonic Temple — masonic temple in Allentown, Pennsylvania
•Allentown National Bank — bank building in Allentown, Pennsylvania
Doable as a same-day drive at 5h 21m. Total distance: 272.6 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
5h 21m drive, comfortable solo distance.
Frequently Asked Questions
The longest stretch is about 170.5 miles on Pennsylvania Turnpike. The full list of main roads is in the Roads section above.
Expect about $22.23 in tolls one way, starting with Pennsylvania Turnpike. Most Northeast and Midwest toll agencies accept E-ZPass; in the West and Texas, transponders like TxTag or FasTrak apply. If you do not have a transponder, cashless tolling plates will mail a bill to the vehicle's registered address — usually with a surcharge, so a rental-car toll pass is often cheaper than paying by mail.
Yes — we found about 23 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at Allentown, PA before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. There are 23 rest areas along the route for bathroom stops.
The main spots that need attention: at 5.4 miles: Highway fork - watch signs carefully. Lane positioning matters here; at 176 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 176.9 miles: Highway fork - watch signs carefully. Lane positioning matters here.
Yes — Carlisle Federal Indian Boarding School National Monument, Appalachian National Scenic Trail and Flight 93 National Memorial (5 total within detour distance). See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 5.4 hours each way, a round trip means 10.7 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Allentown, PA before the return drive.
