How far is Mercer, PA from Allentown, PA?
Fastest route
The distance between Mercer, Pennsylvania 16137 and Allentown, Pennsylvania is approximately 309 miles (497 kilometers). The fastest route, taking into account current traffic conditions, is via I-80 E. The estimated travel time is 4 hours and 38 minutes.
Directions
To travel from Mercer, Pennsylvania 16137 to Allentown, Pennsylvania:
- Start by heading south on US-19 S/Erie St toward W Market St.
- Continue on US-19 S and pass by NAPA Auto Parts - Hometown Auto Parts, Inc on the right after 0.3 miles.
- Turn left onto the ramp to Clarion.
- Follow I-80 E and I-476 S.
- Take the PA-145/MacArthur Rd exit from US-22 E.
- Take exit 277 toward PA-940/I-476/Allentown/Wilkes-Barre/Pennsylvania Tpke (toll road).
- Keep right at the fork, following signs for I-476 S/Allentown, and merge onto I-476 S (toll road).
- Take exit 56 for US-22 toward Lehigh Vly/I-78/PA-309/Allentown/Harrisburg (toll road).
- Turn right to merge onto US-22 E.
- Take the PA-145/MacArthur Rd exit toward 7th Street.
- Keep right at the fork, following signs for Allentown, and merge onto PA-145 S/MacArthur Rd.
- Follow PA-145 S, passing Wells Fargo Bank on the right after 1 mile.
- Finally, turn left onto Hamilton St.
Tips & Suggestions
- 🚗 Plan your journey ahead of time to ensure a smooth travel experience.
- ⛽ Make sure your vehicle has enough fuel for the entire trip, especially if there are limited gas stations along the way.
- 📱 Use a GPS or navigation app to help you stay on the designated route.
- 🚧 Stay updated on current traffic conditions to avoid delays and plan accordingly.
- 📝 Take note of any toll roads along the route and have the necessary payment methods available.
- 🍴 Consider packing some snacks and drinks for the journey to stay refreshed and energized.
- 🚻 Take breaks during the trip to stretch your legs and use restroom facilities, if needed.
- 🛣️ Observe traffic signs and follow the speed limits for a safe and enjoyable journey.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
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 05h 06m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
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.
Township in Centre County, Pennsylvania
Route Weather Snapshot
Check the forecast at both ends before you head out.
Chance Rain Showers
Chance Rain Showers
Driving Route Map
The map below follows the saved road route between Mercer and Allentown.
Turn-by-Turn Driving Directions
Step-by-step road directions between Mercer and Allentown.
-
1
Start on Erie Street
2.2 mi · 4 min · Erie Street
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2
Continue on Perry Highway
963 ft · 24 sec · Perry Highway
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3
Take the ramp left toward I 80 East: Clarion
1120 ft · 27 sec
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4
Merge slight left onto Keystone Shortway
208.4 mi · 3 hr 44 min · Keystone Shortway
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5
Take the exit slight right toward PA 54: Danville, Washingtonville
1080 ft · 27 sec
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6
Turn slight left
24 m · 3 sec
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7
Turn right onto Continental Boulevard
2.9 mi · 4 min · Continental Boulevard
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8
Continue on Factory Street
716 ft · 20 sec · Factory Street
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9
Continue on Danville-Riverside Bridge Road
1799 ft · 49 sec · Danville-Riverside Bridge Road
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10
Turn left onto Elysburg Road
9.7 mi · 11 min · Elysburg Road
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11
Continue on State Route 54
11.1 mi · 13 min · State Route 54
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12
Continue on Locust Gap Highway
1897 ft · 42 sec · Locust Gap Highway
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13
Continue on Fairgrounds Road
2.2 mi · 2 min · Fairgrounds Road
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14
Continue on Sunbury Road
9.4 mi · 11 min · Sunbury Road
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15
Continue on Sunbury Street
1.2 km · 1 min · Sunbury Street
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16
Turn right onto Pottsville Minersville Highway
1.8 mi · 2 min · Pottsville Minersville Highway
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17
Turn right onto Gordon Nagle Trail
4 mi · 7 min · Gordon Nagle Trail
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18
Continue on North Sillyman Street
1281 ft · 33 sec · North Sillyman Street
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19
Turn left onto Pottsville Street
1.1 km · 2 min · Pottsville Street
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20
Turn right onto Route 61 South
150 m · 6 sec · Route 61 South
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21
Continue on Center Avenue
10.6 mi · 13 min · Center Avenue
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22
Continue on Centre Street
2.7 mi · 4 min · Centre Street
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23
Take the exit slight right toward I 78 East, US 22 East: Allentown
1423 ft · 41 sec
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24
Merge slight left onto William Penn Highway
21.6 mi · 27 min · William Penn Highway
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25
Keep slight right to continue on Lehigh Valley Thruway
1.5 km · 1 min · Lehigh Valley Thruway
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26
Take the exit slight right toward Cetronia
1053 ft · 27 sec
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27
Turn straight onto Tilghman Street
4.9 mi · 8 min · Tilghman Street
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28
Arrive at your destination
0 m · 1 sec · Tilghman Street
Car Route Details
A richer read on the saved driving route between Mercer and Allentown.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
Keystone Shortway
Merge slight left onto Keystone Shortway
208 mi · 03h 44m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Chance Rain Showers leaving Mercer and Chance Rain Showers near Allentown.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Mercer to Allentown?
The road trip is about 296.4 miles (477 km) and usually takes 05h 06m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Curtin is a useful midpoint, sitting about 147.9 miles from Mercer and 148.4 miles from Allentown.
How much longer is the road route than the straight-line distance?
The direct path is about 251.6 miles (404.9 km), while the road route adds roughly 44.8 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 6:00 AM to 8:00 AM EDT. If you want a more comfortable same-day return, try to leave by 6:48 AM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $42.74 one way or $85.48 round trip. Estimated CO2 is about 93 kg one way.
What should you check before leaving?
Before you leave, expect Chance Rain Showers around Mercer and Chance Rain Showers near Allentown.
Stop Ideas Near Curtin
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 Curtin.
Lewistown
Tyrone
Huntingdon
Altoona Transportation Center
Flight Path Map
This map shows the direct air route between Mercer and Allentown. Straight-line distance: 251.6 mi (404.91 km).
#1 Mercer
Borough in Mercer County, Pennsylvania, United States
| Population | 1,865 |
| Coordinates | 41.2270000, -80.2397900 |
| Altitude | 395 |
| Country | United States |
#2 Allentown
The third most populous city in Pennsylvania.
| Population | 121,470 |
| Coordinates | 40.6084300, -75.4901800 |
| Altitude | 103 |
| Country | United States |
End: Tilghman Street (-75.490007, 40.608068)
Estimated Travel Time
Distance: 477 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 09h 52m |
| 40 mph (64.37 km/h) | 07h 24m |
| 50 mph (80.47 km/h) | 05h 55m |
| 60 mph (96.56 km/h) | 04h 56m |
| 70 mph (112.65 km/h) | 04h 14m |
| 80 mph (129 km/h) | 03h 41m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $42.74 | $85.48 |
| Mid-grade | $4.60 | $48.11 | $96.21 |
| Premium | $4.95 | $51.82 | $103.64 |
| Diesel | $5.98 | $62.55 | $125.10 |
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 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.