State Line, PA to Bethlehem, PA is 153.4 miles and takes about 3h 8m via I 81 and William Penn Highway, with a fuel budget near $25 and enough daylight to finish in a day. This trip stays within Pennsylvania, connecting two points in the Northeast region. It's a straightforward drive, ideal for a single-day excursion. You'll experience a mixed driving profile, so be prepared for a bit of everything as you make your way east.
Trip Pace
Same-day drive is realistic
A same-day return is realistic if you keep stops short.
Break Rhythm
1 planned break
A short stop every 2 to 3 hours is enough for this drive.
Midpoint
76.7 miles from State Line, PA
A natural place for your longest stop of the day
, about 1h 33m into the drive
.
Main Roads
Road
Distance
Duration
I 81
61.5 mi
1h 13m
William Penn Highway
42.8 mi
50m
American Legion Memorial Highway
22.5 mi
27m
Lehigh Valley Thruway
10.3 mi
14m
78th Division Highway
7.6 mi
8m
Bethlehem Spur Route
1.8 mi
2m
Molly Pitcher Highway
1.8 mi
2m
West Union Boulevard
1 mi
2m
Longest stretch:
I 81
— 61.5 mi, about 1h 13m
Turn-by-Turn Driving Directions
Step-by-step road directions between State Line, PA and Bethlehem, PA.
1
Start on US 11
0.2 mi·17 sec·Pennsylvania Avenue North
2
Continue on US 11
1.8 mi·2 min·Molly Pitcher Highway
3
Take the ramp
0.4 mi·55 sec
4
Merge onto I 81
62 mi·1 hr 13 min·I 81
Use the straight / slight right lanes.
5
Take the exit
0.2 mi·14 sec
Toward US 11, US 15: Enola, Marysville
6
Keep slight left at fork
0.3 mi·28 sec
Toward US 11 North, US 15 North: Marysville
7
Keep slight left at fork
0.4 mi·32 sec
8
Merge onto I 81
0.7 mi·1 min·George N. Wade Memorial Bridge
Use the straight / slight right lanes.
9
Continue on I 81
3.4 mi·4 min·American Legion Memorial Highway
10
Keep slight left at fork onto I 81
19 mi·22 min·American Legion Memorial Highway
Use the straight / slight right lanes.
11
Take the exit
0.7 mi·45 sec
Exit 89Toward I 78 East: Allentown
12
Continue on I 78
7.6 mi·8 min·78th Division Highway
13
Continue on I 78; US 22
43 mi·50 min·William Penn Highway
Use the straight lane.
14
Keep slight right at fork onto US 22
10 mi·14 min·Lehigh Valley Thruway
Exit 51Toward US 22 East: Pennsylvania Turnpike, LVI AirportUse the slight right lane.
15
Take the exit
0.2 mi·26 sec
Toward PA 378 South: Bethlehem, Schoenersville RoadUse the slight right lane.
16
Keep slight right at fork
0.2 mi·21 sec
Toward PA 378 South: BethlehemUse the straight / slight right lanes.
17
Continue on PA 378
1.8 mi·2 min·Bethlehem Spur Route
18
Take the exit
0.2 mi·33 sec
Exit 2Toward Eighth AvenueUse the slight right lane.
19
Turn right onto 8th Avenue
0.1 mi·22 sec·8th Avenue
20
Turn left onto West Union Boulevard
1.0 mi·2 min·West Union Boulevard
21
Turn left onto Center Street
423 ft·11 sec·Center Street
22
Turn right onto East Goepp Street
0.3 mi·49 sec·East Goepp Street
23
Turn right onto Linden Street
57 ft·1 sec·Linden Street
24
Arrive at destination
Linden Street
Trip Plan
Given the relatively short duration of 3 hours and 8 minutes, this is a perfect one-day trip. Aim to depart in the morning to maximize daylight and have flexibility. Plan for one stop along the way, perhaps midway, to break up the 61.5-mile longest stretch on I 81. Keep an eye on your fuel gauge, as the estimated cost is around $25, and it's always wise to top off before heading into less populated stretches. The mixed driving profile means you might encounter varied speed limits and road conditions, so stay alert.
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 76.7 miles from State Line, PA, or about 1h 33m into the drive.
The longest continuous stretch on this route runs about 61.5 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 34 miles or 41m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 76.7 miles or 1h 33m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 2h 31m
Traffic, exits, and arrival timing usually matter more near Bethlehem, PA than in the middle of the route.
Before You Leave
+
Open the route before leaving State Line, 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 State Line, PA
This is one driving day of about 153.4 miles and 3h 8m.
Your first comfortable stop window is around 34 miles from State Line, 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 I 81 for about 61.5 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 16
5 decision points cluster between mile 64.1 and 151.7 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
64.1 mi into trip|~1h 17m 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
139.2 mi into trip|~2h 47m 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...
7
149.4 mi into trip|~3h 1m in
Take the exit toward PA 378 South: Bethlehem, Schoenersville Road
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 PA 378 South: Bethlehem, Schoenersville...
8
149.6 mi into trip|~3h 1m in
Keep slight right at fork toward PA 378 South: Bethlehem
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward PA 378 South: Bethlehem
7
151.7 mi into trip|~3h 4m in
Take the exit toward Eighth Avenue
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight right lane.
Exit 2
Toward Eighth Avenue
Fuel & Cost
Regular Gas
$25.43 one way
$50.86 round trip
$4.21/gal25.4 MPG avg54 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.61
$27.85
$55.71
premium
$4.93
$29.75
$59.50
diesel
$5.61
$33.87
$67.74
Estimated Tolls: $0.72
Lehigh Valley Thruway
(10.3 mi)$0.72
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
$25
Tolls
$1
Meals
$25–$50
Total
$51–$76
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 53.7 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $16 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
46
0
$16.11
$7.36
Efficient EV
38.4
0
$13.42
$6.14
EV Truck/SUV
61.4
0
$21.48
$9.82
Gas CO2
54 kg
EV CO2
18 kg (67% less)
This trip is well within single-charge range for most EVs. No charging stops needed if you start fully charged.
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 Apr 18, 2026
Origin
State Line, PA
Morning
in State Line on Tuesday
Local time
7:10 AM
EDT
Current temp
64°F
Unavailable
Live forecast
Destination
Bethlehem, PA
Morning
in Bethlehem on Tuesday
Local time
7:10 AM
EDT
Current temp
72°F
Partly Sunny
SE 0 to 10 mph1% chanceLive forecast
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
8 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
3h 8m on the road
The weather snapshot is not static. If you are leaving later, give both cities one more quick forecast check before departure.
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...
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...
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route offers a mixed drive, with about 40% of it on highways. You'll encounter a longest stretch of 61.5 miles on I 81, providing a good opportunity for steady progress. The journey transitions between the efficiency of interstates and the character of roads like the William Penn Highway and American Legion Memorial Highway. Expect the feel of the drive to change as you move from faster highway sections to potentially more varied terrain on the other named roads.
40% highway, the rest on surface roads — varied driving throughout.
24 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 61.5 mi on I 81.
How Hard Is This Drive?
10/10
This route mixes highway mileage with some local-road sections near the start or finish. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 64.1 miles in.
Driving Effort10/10
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 16 significant decision points across 153.4 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 64.1 miles: Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 139.2 miles (US 22 / Lehigh Valley Thruway): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 149.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between State Line, PA and Bethlehem, PA, road signs point toward Marysville and Lvi Airport.
Bethlehem is one of three cities, along with Allentown and Easton, that are the urban population centers of the Lehigh Valley in eastern Pennsylvania.
In the Lehigh Valley, Bethlehem borders Nazareth to its northwest, Allentown to its west, Hellertown to its southeast, and Easton to its east. The city is about 70 miles (110 km) north of Philadelphia, the sixth-largest city in the United States, and about 80 miles (130 km) west of New York City, the nation's largest city.
Doable as a same-day drive at 3h 8m. Total distance: 153.4 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
3h 8m drive, comfortable solo distance.
Scenic Drive
Mixed highway & surface route profile with national parks nearby.
Frequently Asked Questions
The longest stretch is about 61.5 miles on I 81. The full list of main roads is in the Roads section above.
Expect about $0.72 in tolls one way, starting with Lehigh Valley Thruway. 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.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
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 Bethlehem, 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. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 64.1 miles: Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 139.2 miles (US 22 / Lehigh Valley Thruway): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 149.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Carlisle Federal Indian Boarding School National Monument and Appalachian National Scenic Trail. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 3.1 hours each way, an in-and-out day trip would put you behind the wheel for 6.3 hours — manageable with a long break at Bethlehem, PA, but most travelers stay overnight.
