This 233.7-mile drive from Saint Marys to Bethlehem, Pennsylvania, is best tackled in a single day, taking approximately 4 hours and 48 minutes. You'll primarily navigate the Keystone Shortway and the William Penn Highway, with State Route 54 also playing a role. With a fuel cost estimated at $39 and a highway share of only 5%, this route offers a more local feel. Given its duration and the region you're traveling within (Northeast to Northeast), it's a manageable day trip, allowing for flexibility in your schedule. Expect a fairly turn-heavy local drive for much of the journey.
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
116.9 miles from Saint Marys, PA
A natural place for your longest stop of the day
, about 2h 20m into the drive
.
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Drive Character
This route is characterized as a turn-heavy local drive, with only a 5% highway share, meaning you'll experience more varied road conditions than a typical interstate cruise. The longest uninterrupted stretch is 112.7 miles along the Keystone Shortway, offering a period of more consistent travel before you transition onto other roads. Be prepared for a dynamic driving experience that shifts between faster sections and more winding local roads as you progress toward Bethlehem. This isn't a monotonous highway journey; rather, it's a route that keeps you engaged with its changing scenery and road types.
This route has more turning and local-road decision points than a simple highway run.
There are about 39 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
Keystone Shortway is the longest continuous segment at about 112.7 miles.
How Hard Is This Drive?
Expect a hands-on drive with frequent turns and local roads rather than long highway stretches. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 140.2 miles in.
Route Complexity9/10
High effort - long or complex enough to need steady focus all day
This is a demanding drive. With 21 significant decision points across 233.7 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 140.2 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 219.5 miles (US 22 / Lehigh Valley Thruway): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 229.7 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Critical Maneuvers
5 of 21 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
5
140.2 mi into trip|~2h 46m in
Take the exit toward PA 54: Danville, Washingtonville
Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one
Toward PA 54: Danville, Washingtonville
9
219.5 mi into trip|~4h 27m 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
229.7 mi into trip|~4h 41m 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
229.9 mi into trip|~4h 41m 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
232 mi into trip|~4h 44m 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
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Saint Marys, PA and Bethlehem, PA, road signs point toward Washingtonville and Lvi Airport.
Washingtonville
140.2 mi in|~2h 46m
Lvi Airport
219.5 mi in|~4h 27m|via US 22
Main Roads
Road
Distance
Duration
Keystone Shortway
112.7 mi
2h 1m
William Penn Highway
21.6 mi
26m
State Route 54
11.1 mi
13m
Million Dollar Highway
10.9 mi
16m
Center Avenue
10.6 mi
12m
Lehigh Valley Thruway
10.3 mi
14m
Elysburg Road
9.7 mi
11m
Sunbury Road
9.4 mi
11m
Longest stretch:
Keystone Shortway
— 112.7 mi, about 2h 1m
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Marys, PA and Bethlehem, PA.
1
Start on PA 120; PA 255
45 ft·1 sec·Railroad Street
2
Turn left onto PA 120; PA 255
223 ft·4 sec·South Michael Street
3
Turn slight left onto PA 120
0.2 mi·22 sec·PA 120
4
Continue on PA 255
11 mi·16 min·Million Dollar Highway
5
Continue on PA 255
7.9 mi·12 min·Bennetts Valley Highway
6
Turn left onto PA 153
8.1 mi·14 min·State Park Road
7
Turn left
0.3 mi·40 sec
8
Merge onto I 80
113 mi·2 hr 1 min·Keystone Shortway
9
Take the exit
0.2 mi·26 sec
Toward PA 54: Danville, Washingtonville
10
Turn slight left
79 ft·2 sec
11
Turn right onto PA 54
2.9 mi·3 min·Continental Boulevard
Use the straight / right lanes.
12
Continue on PA 54
0.1 mi·19 sec·Factory Street
13
Continue on PA 54
0.3 mi·49 sec·Danville-Riverside Bridge Road
14
Turn left onto PA 54
9.7 mi·11 min·Elysburg Road
Use the left lane.
15
Continue on PA 54
11 mi·13 min·State Route 54
16
Continue on PA 901
0.4 mi·41 sec·Locust Gap Highway
17
Continue on PA 901
2.2 mi·2 min·Fairgrounds Road
18
Continue on PA 901
9.4 mi·11 min·Sunbury Road
19
Continue on PA 901
0.8 mi·1 min·Sunbury Street
20
Turn right onto PA 901
1.8 mi·2 min·Pottsville Minersville Highway
21
Turn right onto PA 901
4.0 mi·6 min·Gordon Nagle Trail
22
Continue on PA 901
0.2 mi·33 sec·North Sillyman Street
23
Turn left onto PA 183
0.7 mi·2 min·Pottsville Street
24
Turn right onto PA 61
493 ft·6 sec·Route 61 South
25
Continue on PA 61
11 mi·12 min·Center Avenue
Use the straight / right lanes.
26
Continue on PA 61
2.7 mi·3 min·Centre Street
27
Take the exit
0.3 mi·41 sec
Toward I 78 East, US 22 East: Allentown
28
Merge onto I 78; US 22
22 mi·26 min·William Penn Highway
Use the straight lane.
29
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.
30
Take the exit
0.2 mi·26 sec
Toward PA 378 South: Bethlehem, Schoenersville RoadUse the slight right lane.
31
Keep slight right at fork
0.2 mi·21 sec
Toward PA 378 South: BethlehemUse the straight / slight right lanes.
32
Continue on PA 378
1.8 mi·2 min·Bethlehem Spur Route
33
Take the exit
0.2 mi·33 sec
Exit 2Toward Eighth AvenueUse the slight right lane.
34
Turn right onto 8th Avenue
0.1 mi·22 sec·8th Avenue
35
Turn left onto West Union Boulevard
1.0 mi·2 min·West Union Boulevard
36
Turn left onto Center Street
423 ft·11 sec·Center Street
37
Turn right onto East Goepp Street
0.3 mi·49 sec·East Goepp Street
38
Turn right onto Linden Street
57 ft·1 sec·Linden Street
39
Arrive at destination
Linden Street
Trip Plan
With a total duration of under 5 hours, this drive from Saint Marys to Bethlehem is well-suited for a single day. Plan to depart in the morning to allow ample time for the drive and any potential brief stops. The longest stretch of 112.7 miles on the Keystone Shortway means you can cover significant ground before needing to refuel. Given the route's turn-heavy local character, staying alert and mindful of speed limits will be key. With only one recommended stop and a reasonable fuel cost of $39, this trip offers a straightforward and budget-friendly travel experience.
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 116.9 miles from Saint Marys, PA, or about 2h 20m into the drive.
The longest continuous stretch on this route runs about 112.7 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 80 miles or 1h 41m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 116.9 miles or 2h 20m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 52m
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 Saint Marys, 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 Saint Marys, PA
This is one driving day of about 233.7 miles and 4h 48m.
Your first comfortable stop window is around 80 miles from Saint Marys, 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 Keystone Shortway for about 112.7 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 116.9 mi from Saint Marys, PA
· 2h 20m into the drive
The midpoint is around 116.9 miles from Saint Marys, PA, which is a good place for a longer meal and fuel stop.
Before the longest stretch
Fuel check
Top up before Keystone Shortway if your tank is already low. That segment runs about 112.7 miles.
Arriving in Bethlehem, PA
The final approach into Bethlehem, PA usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Bethlehem, PA.
After long uninterrupted mileage, take five minutes before the last urban segment to reset and refocus on exits, merges, and city traffic.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
National Parks Near This Route
Worth a detour if your schedule allows.
Appalachian National Scenic Trail
National Scenic Trail
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...
21 mi from route
~53 min detour
Free
near mile 185.3
Park Closure: List of trail closures post-Hurricane Helene
Caution: Black Bears Frequenting the McAfee Knob Area in Virginia
Park data from the National Park Service API. Alerts update every 2 hours.
Fuel & Cost
Regular Gas
$38.74 one way
$77.49 round trip
$4.21/gal25.4 MPG avg82 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.61
$42.43
$84.87
premium
$4.93
$45.32
$90.65
diesel
$5.61
$51.60
$103.20
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
$39
Tolls
$1
Meals
$25–$50
Total
$64–$89
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 81.8 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $25 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
70.1
0
$24.54
$11.22
Efficient EV
58.4
0
$20.45
$9.35
EV Truck/SUV
93.5
1
$32.72
$14.96
Gas CO2
82 kg
EV CO2
27 kg (67% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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 data refreshed 1 day ago
Origin
Saint Marys, PA
Late night
in Saint Marys on Wednesday
Local time
3:34 AM
EDT
Current temp
50°F
Unavailable
Live forecast
Destination
Bethlehem, PA
Late night
in Bethlehem on Wednesday
Local time
3:34 AM
EDT
Current temp
55°F
Unavailable
Live forecast
53°F
Union, NY
117 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
5 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
4h 48m 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.
Frequently Asked Questions
The drive from Saint Marys, PA to Bethlehem, PA covers 233.7 miles and takes about 4h 48m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are Keystone Shortway, William Penn Highway, State Route 54. Expect a mix of highway and local road driving.
This is a comfortable same-day trip.
The midpoint is about 116.9 miles from Saint Marys, PA. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $38.74 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
An early start around 7-8 AM gets you there with plenty of daylight left. A late afternoon start means arriving after dark. Morning is better.
Plan about 1 meaningful break for fuel, food, or rest. Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
This is a demanding drive. With 21 significant decision points across 233.7 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.
The main spots that need attention: at 140.2 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 219.5 miles (US 22 / Lehigh Valley Thruway): Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 229.7 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Between Saint Marys, PA and Bethlehem, PA, road signs point toward Washingtonville and Lvi Airport.
