How far is Monroe, LA from Port Sulphur, LA?
The driving distance from Monroe, LA to Port Sulphur, LA is about 313.6 miles (504.7 km), with a travel time of about 06h 15m by car.
- The straight-line flight distance is about 253.8 miles (408.5 km).
- For a round trip, plan for roughly 12h 30m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 7:30 AM CDT.
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 06h 15m.
Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
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.
City in Illinois
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Clear
Driving Route Map
The map below follows the saved road route between Monroe and Port Sulphur.
Turn-by-Turn Driving Directions
Step-by-step road directions between Monroe and Port Sulphur.
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1
Start on the route
12 m · 8 sec
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2
Turn left
14 m · 5 sec
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3
Turn right onto Louisville Avenue
81 m · 9 sec · Louisville Avenue
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4
Turn right onto North 5th Street
1103 ft · 19 sec · North 5th Street
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5
Continue on North 5th Street
140 m · 8 sec · North 5th Street
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6
Continue on Lea Joyner Memorial Expressway
1.1 km · 1 min · Lea Joyner Memorial Expressway
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7
Take the ramp left
958 ft · 23 sec
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8
Merge slight left
20.3 mi · 22 min
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9
Take the exit slight right toward US 425: Rayville, Archibald
1531 ft · 42 sec
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10
Turn right
76.2 mi · 1 hr 28 min
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11
Keep slight right
526 ft · 14 sec
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12
Merge slight left onto Seargent Prentiss Drive
79.3 mi · 1 hr 34 min · Seargent Prentiss Drive
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13
Take the exit straight toward I 110 South: Baton Rouge
2467 ft · 48 sec
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14
Continue on Martin Luther King, Jr. Memorial Freeway
2.5 mi · 3 min · Martin Luther King, Jr. Memorial Freeway
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15
Continue on Martin Luther King Jr Memorial Freeway
5.7 mi · 7 min · Martin Luther King Jr Memorial Freeway
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16
Keep slight left to continue on Martin Luther King Jr Memorial Freeway
2897 ft · 36 sec · Martin Luther King Jr Memorial Freeway
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17
Merge slight right
74.7 mi · 1 hr 25 min
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18
Keep slight right to continue on Pontchartrain Expressway
3.5 mi · 4 min · Pontchartrain Expressway
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19
Keep slight left to continue on Pontchartrain Expressway
2.4 mi · 3 min · Pontchartrain Expressway
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20
Continue on Crescent City Connection
1.1 km · 1 min · Crescent City Connection
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21
Continue on Westbank Expressway
2.7 mi · 4 min · Westbank Expressway
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22
Take the exit slight right toward LA 23 South, LA 18 West: Lafayette Street
1312 ft · 32 sec
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23
Turn straight onto Westbank Expressway
90 m · 13 sec · Westbank Expressway
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24
Turn left onto Lafayette Street
2063 ft · 29 sec · Lafayette Street
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25
Continue on Belle Chasse Highway
42.3 mi · 58 min · Belle Chasse Highway
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26
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between Monroe and Port Sulphur.
Long-distance drive
This route is long enough that fuel, rest stops, weather, and timing matter more than any single maneuver.
Seargent Prentiss Drive
Merge slight left onto Seargent Prentiss Drive
79.3 mi · 01h 34m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
Better with a longer stop
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
Mostly Sunny leaving Monroe and Mostly Clear near Port Sulphur.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Monroe to Port Sulphur?
The road trip is about 313.6 miles (504.7 km) and usually takes 06h 15m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is long enough that most travelers will be better off planning an overnight stay or a more deliberate stop window.
What is the halfway point on this route?
Saint Francisville is a useful midpoint, sitting about 157 miles from Monroe and 156.7 miles from Port Sulphur.
How much longer is the road route than the straight-line distance?
The direct path is about 253.8 miles (408.5 km), while the road route adds roughly 59.8 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 7:30 AM CDT. Starting early still helps, but most travelers will want a longer stop or an overnight stay on a route this long.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $41.92 one way or $83.84 round trip. Estimated CO2 is about 98.4 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Monroe and Mostly Clear near Port Sulphur.
Stop Ideas Near Saint Francisville
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 Saint Francisville.
Baton Rouge, Louisiana
Lafayette
Hammond
New Iberia
Flight Path Map
This map shows the direct air route between Monroe and Port Sulphur. Straight-line distance: 253.81 mi (408.46 km).
#1 Monroe
The most populous city in Ouachita Parish, Louisiana.
| Population | 46,998 |
| Coordinates | 32.5093100, -92.1193000 |
| Altitude | 23 |
| Country | United States |
#2 Port Sulphur
City in Louisiana, United States of America
| Population | 1,760 |
| Coordinates | 29.4804900, -89.6939500 |
| Altitude | 1 |
| Country | United States |
End: Port Sulphur (-89.69395, 29.48049)
Estimated Travel Time
Distance: 505 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 10h 27m |
| 40 mph (64.37 km/h) | 07h 50m |
| 50 mph (80.47 km/h) | 06h 16m |
| 60 mph (96.56 km/h) | 05h 13m |
| 70 mph (112.65 km/h) | 04h 28m |
| 80 mph (129 km/h) | 03h 54m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.79 | $41.92 | $83.84 |
| Mid-grade | $4.26 | $47.15 | $94.29 |
| Premium | $4.63 | $51.20 | $102.40 |
| Diesel | $5.42 | $59.94 | $119.89 |
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 Louisiana · Apr 16, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.