Trip from Saint Marys, PA to Allentown, PA

Data updated 0 seconds ago

Drive Time

4h 36m

Distance

225.6 mi

363 km

Drive Score

8/10

Great drive

Same Day?

Yes, doable

Fuel Cost

$37

one way

EV Charging

station data

Best Time to Leave

Save up to 41 min

4 AM

4h 23m ★

6 AM

4h 37m

8 AM

5h 4m

10 AM

4h 46m

12 PM

4h 44m

3 PM

4h 48m

5 PM

5h 2m

8 PM

4h 29m

Estimated drive times based on typical traffic patterns. Actual times may vary with weather, construction, and real-time conditions.

Best Time Drive vs Fly

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Saint Marys, PA

RDNE Stock project

county seat city in Lehigh County, Pennsylvania, United States

Allentown, PA

Wikimedia Commons

Trip Overview

Embarking on this 225.6-mile journey from Saint Marys to Allentown, Pennsylvania, will take you approximately 4 hours and 36 minutes of driving time. With a projected fuel cost of around $37, this route is well-suited for a single-day trip, allowing you to cover the distance without needing an overnight stop. You'll be navigating primarily on the Keystone Shortway, William Penn Highway, and State Route 54, experiencing a drive that involves a fair number of turns. Given that both your origin and destination are within the Northeast region, you'll be staying within familiar territory for this Pennsylvania traverse.

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

112.8 miles from Saint Marys, PA

A natural place for your longest stop of the day , about 2h 16m into the drive .

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Drive Character

Expect a 'turn-heavy local drive' for this 225.6-mile stretch, with only about 5% of the journey on higher-speed highways. The majority of your time will be spent on roads like the Keystone Shortway, William Penn Highway, and State Route 54, which are more characteristic of local routes. The longest uninterrupted segment you'll encounter is 112.7 miles on the Keystone Shortway, offering a substantial period of consistent travel before the route transitions. This profile suggests a drive where you'll be actively engaged with the road, making frequent adjustments.

This route has more turning and local-road decision points than a simple highway run.

There are about 32 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 Complexity 7/10

Demanding - plan breaks and stay ahead of the key maneuvers

This is a demanding drive. With 15 significant decision points across 225.6 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 140.2 miles: Exit ramp - move to the correct lane early. Multiple destination signs - pick the right one; at 140.5 miles (PA 54 / Continental Boulevard): Lane positioning matters here; at 143.8 miles (PA 54 / Elysburg Road): Lane positioning matters here.

Critical Maneuvers

5 of 15 key points

These are the spots where you need to pay the most attention. Preview them before you drive.

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

140.5 mi into trip | ~2h 46m in | PA 54 / Continental Boulevard

Turn right onto PA 54 / Continental Boulevard

Lane positioning matters here

Use the straight / right lanes.

143.8 mi into trip | ~2h 51m in | PA 54 / Elysburg Road

Turn left onto PA 54 / Elysburg Road

Lane positioning matters here

Use the left lane.

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...

220.4 mi into trip | ~4h 28m in

Take the exit toward Cetronia

Exit ramp - move to the correct lane early. Lane positioning matters here

Use the slight right lane. Toward Cetronia

Towns Mentioned on Route Signs

Based on OSRM destination-sign hints, not a full list of every settlement the road passes.

On the drive from Saint Marys, PA to Allentown, PA, road signs begin pointing toward Washingtonville along the way.

Washingtonville

140.2 mi in | ~2h 46m

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
Elysburg Road	9.7 mi	11m
Sunbury Road	9.4 mi	11m
State Park Road	8.1 mi	14m

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 Allentown, PA.

Start on PA 120; PA 255

45 ft · 1 sec · Railroad Street

Turn left onto PA 120; PA 255

223 ft · 4 sec · South Michael Street

Turn slight left onto PA 120

0.2 mi · 22 sec · PA 120

Continue on PA 255

11 mi · 16 min · Million Dollar Highway

Continue on PA 255

7.9 mi · 12 min · Bennetts Valley Highway

Turn left onto PA 153

8.1 mi · 14 min · State Park Road

Turn left

0.3 mi · 40 sec

Merge onto I 80

113 mi · 2 hr 1 min · Keystone Shortway

Take the exit

0.2 mi · 26 sec

Toward PA 54: Danville, Washingtonville

Turn slight left

79 ft · 2 sec

Turn right onto PA 54

2.9 mi · 3 min · Continental Boulevard

Use the straight / right lanes.

Continue on PA 54

0.1 mi · 19 sec · Factory Street

Continue on PA 54

0.3 mi · 49 sec · Danville-Riverside Bridge Road

Turn left onto PA 54

9.7 mi · 11 min · Elysburg Road

Use the left lane.

Continue on PA 54

11 mi · 13 min · State Route 54

Continue on PA 901

0.4 mi · 41 sec · Locust Gap Highway

Continue on PA 901

2.2 mi · 2 min · Fairgrounds Road

Continue on PA 901

9.4 mi · 11 min · Sunbury Road

Continue on PA 901

0.8 mi · 1 min · Sunbury Street

Turn right onto PA 901

1.8 mi · 2 min · Pottsville Minersville Highway

Turn right onto PA 901

4.0 mi · 6 min · Gordon Nagle Trail

Continue on PA 901

0.2 mi · 33 sec · North Sillyman Street

Turn left onto PA 183

0.7 mi · 2 min · Pottsville Street

Turn right onto PA 61

493 ft · 6 sec · Route 61 South

Continue on PA 61

11 mi · 12 min · Center Avenue

Use the straight / right lanes.

Continue on PA 61

2.7 mi · 3 min · Centre Street

Take the exit

0.3 mi · 41 sec

Toward I 78 East, US 22 East: Allentown

Merge onto I 78; US 22

22 mi · 26 min · William Penn Highway

Use the straight lane.

Keep slight right at fork onto US 22

1.0 mi · 1 min · Lehigh Valley Thruway

Exit 51 Toward US 22 East: Pennsylvania Turnpike, LVI Airport Use the slight right lane.

Take the exit

0.2 mi · 26 sec

Toward Cetronia Use the slight right lane.

Turn straight onto Tilghman Street

4.9 mi · 8 min · Tilghman Street

Use the straight lane.

Arrive at destination

Tilghman Street

Trip Plan

For this roughly 4.5-hour drive, starting in the morning will give you ample time to reach Allentown comfortably. With only one suggested stop and a moderate distance, you have flexibility in pacing. Keep an eye on your fuel levels, as the $37 estimate is based on the entire 225.6 miles. A practical tip for this turn-heavy route is to ensure your navigation system is set to avoid toll roads if you prefer, as this can sometimes alter the path and introduce more local roads. The longest stretch of 112.7 miles on the Keystone Shortway is a good opportunity to settle in before you need to be more attentive to changing road conditions.

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 112.8 miles from Saint Marys, PA, or about 2h 16m 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 112.8 miles or 2h 16m 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 43m

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 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 225.6 miles and 4h 36m.

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 112.8 mi from Saint Marys, PA · 2h 16m into the drive

Mid-route town

Meal stop

Union, NY

113 mi into the route

Best for: Lunch, fuel, and a longer reset

This sits close to the middle of the route, so it works well for the longest stop of the day.

Pacing Suggestions

Hornell, NY

Fuel and coffee

A short stop after about 80 miles helps settle the day before fatigue starts building.

Corning, NY

Meal break

The midpoint is around 112.8 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 Allentown, PA

The final approach into Allentown, 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 Allentown, 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.

Fuel & Cost

Regular Gas

$37.40 one way

$74.80 round trip

$4.21/gal 25.4 MPG avg 79 kg CO₂

Fuel Type	$/gal	One Way	Round Trip
midgrade	$4.61	$40.96	$81.93
premium	$4.93	$43.75	$87.50
diesel	$5.61	$49.81	$99.62

Estimated Tolls: $0.07

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

$37

Tolls

Meals

$25–$50

Total

$62–$87

Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.

Estimated CO2 emission: 78.9 kg one way. Prices: EIA weekly data, 2026-04-13.

Driving Electric?

About $24 in charging · 0 stops · 67% less CO₂

Vehicle Type	kWh	Stops	DC Fast	Home Charge
Average EV	67.7	0	$23.69	$10.83
Efficient EV	56.4	0	$19.74	$9.02
EV Truck/SUV	90.2	1	$31.58	$14.44

Gas CO2

79 kg

EV CO2

26 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

3:35 AM

EDT

Current temp

50°F

Unavailable

Live forecast

Destination

Allentown, PA

Late night in Allentown on Wednesday

Local time

3:35 AM

EDT

Current temp

59°F

Unavailable

Live forecast

53°F

Union, NY

113 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

9 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 36m 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 Allentown, PA covers 225.6 miles and takes about 4h 36m 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 112.8 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 $37.40 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.

On the drive from Saint Marys, PA to Allentown, PA, road signs begin pointing toward Washingtonville along the way.

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Trip from Saint Marys, PA to Allentown, PA

Best Time to Leave

Trip Overview

Drive Character

How Hard Is This Drive?

Critical Maneuvers

Towns Mentioned on Route Signs

Main Roads

Turn-by-Turn Driving Directions

Trip Plan

Before You Leave

Where to Stop

Pacing Suggestions

Arriving in Allentown, PA

Fuel & Cost

Travel Intel

Saint Marys, PA

Allentown, PA

Same local time

9 degrees warmer at arrival

4h 36m on the road

Frequently Asked Questions

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