Union, SC to Mount Pleasant, SC is 184.7 miles and takes about 3h 34m via I 26 and Whitmire Highway, with a fuel budget near $29 and enough daylight to finish in a day. This trip stays within South Carolina, moving from the Southeast region to another part of the Southeast. It's a straightforward drive that mostly sticks to major highways, making it a convenient option for a quick transit. You'll find the route efficient if you're looking to cover ground without much complication. Consider this if you need a simple, direct path between these two points.
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
92.4 miles from Union, SC
A natural place for your longest stop of the day
, about 1h 48m into the drive
.
Main Roads
Road
Distance
Duration
I 26
139.1 mi
2h 33m
Whitmire Highway
15.2 mi
17m
Mark Clark Expressway
11.9 mi
14m
Watson Street
7.4 mi
10m
State Highway 121
6.1 mi
9m
Chuck Dawley Boulevard
1.3 mi
2m
North Pinckney Street
1.3 mi
2m
Rivers Avenue
0.8 mi
1m
Longest stretch:
I 26
— 139.1 mi, about 2h 33m
Turn-by-Turn Driving Directions
Step-by-step road directions between Union, SC and Mount Pleasant, SC.
1
Start on SC 18
1.3 mi·2 min·North Pinckney Street
2
Continue on US 176
15 mi·17 min·Whitmire Highway
3
Turn slight left onto US 176; SC 121
7.4 mi·10 min·Watson Street
Use the slight left lane.
4
Keep slight right at fork onto SC 121
6.1 mi·9 min·State Highway 121
5
Take the ramp
0.2 mi·28 sec
6
Merge onto I 26
36 mi·40 min·I 26
Use the straight / slight right lanes.
7
Keep slight right at fork onto I 26
103 mi·1 hr 53 min·I 26
Toward CharlestonUse the straight / slight right lanes.
8
Take the exit
0.2 mi·27 sec
Exit 211A-BToward Aviation Avenue, Remount RoadUse the straight / slight right lanes.
9
Keep slight left at fork
0.4 mi·45 sec
Toward Remount Road, Hanahan
10
Keep slight right at fork
0.2 mi·28 sec
Exit 211BToward Remount Road, HanahanUse the slight right lane.
11
Turn left onto Remount Road
0.4 mi·44 sec·Remount Road
12
Turn right onto US 52; US 78
0.8 mi·1 min·Rivers Avenue
13
Take the ramp
0.4 mi·48 sec
Use the left lane.
14
Merge onto I 526
12 mi·14 min·Mark Clark Expressway
Use the straight / slight right lanes.
15
Continue on I 526 Bus
1.3 mi·2 min·Chuck Dawley Boulevard
16
Turn right onto SC 703
237 ft·12 sec·Coleman Boulevard
17
Turn left
76 ft·5 sec
18
Arrive at destination
Trip Plan
With a drive time under four hours, this route is easily manageable in a single day. Leaving in the morning, perhaps around 9 AM, should get you to your destination well before the afternoon rush. The longest stretch on I 26 is over 139 miles, so plan for one significant fuel and stretch stop before you hit the final 45 miles or so of surface roads. Since the total mileage is relatively low, you have flexibility if you decide to depart later or make an impromptu stop along the way. Remember to check your fuel level before leaving Union, as services can be more spread out on the latter half of the route.
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 92.4 miles from Union, SC, or about 1h 48m into the drive.
The longest continuous stretch on this route runs about 139.1 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 41 miles or 51m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 92.4 miles or 1h 48m 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 53m
Traffic, exits, and arrival timing usually matter more near Mount Pleasant, SC than in the middle of the route.
Before You Leave
+
Open the route before leaving Union, SC 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 Union, SC
This is one driving day of about 184.7 miles and 3h 34m.
Your first comfortable stop window is around 41 miles from Union, SC.
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 26 for about 139.1 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 13
5 decision points cluster between mile 30.1 and 169.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
30.1 mi into trip|~39m in|I 26
Merge onto I 26
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
7
66.3 mi into trip|~1h 19m in|I 26
Keep slight right at fork onto I 26 toward Charleston
Highway fork - watch signs carefully. Lane positioning matters here
Use the straight / slight right lanes.
Toward Charleston
8
169.2 mi into trip|~3h 13m in
Take the exit toward Aviation Avenue, Remount Road
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 211A-B
Toward Aviation Avenue, Remount Road
6
169.4 mi into trip|~3h 13m in
Keep slight left at fork toward Remount Road, Hanahan
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward Remount Road, Hanahan
9
169.8 mi into trip|~3h 14m in
Keep slight right at fork toward Remount Road, Hanahan
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 211B
Toward Remount Road, Hanahan
Fuel & Cost
Regular Gas
$28.88 one way
$57.77 round trip
$3.97/gal25.4 MPG avg65 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.34
$31.58
$63.16
premium
$4.70
$34.18
$68.37
diesel
$5.61
$40.78
$81.56
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$29
Meals
$25–$50
Total
$54–$79
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 64.6 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $19 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
55.4
0
$19.39
$8.87
Efficient EV
46.2
0
$16.16
$7.39
EV Truck/SUV
73.9
0
$25.86
$11.82
Gas CO2
65 kg
EV CO2
22 kg (66% 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 20, 2026
Origin
Union, SC
Late night
in Union on Tuesday
Local time
5:15 AM
EDT
Current temp
82°F
Unavailable
Live forecast
Destination
Mount Pleasant, SC
Late night
in Mount Pleasant on Tuesday
Local time
5:15 AM
EDT
Current temp
77°F
Unavailable
Live 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
5 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
3h 34m on the road
Use the two city cards together: check the sky where you start, then compare it with the local time and temperature at arrival.
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.
Fort Sumter and Fort Moultrie National Historical Park
National Historical Park
Two forts stand at the entrance of Charleston Harbor. Patriots inside a palmetto log fort, later named Fort Moultrie, defeated the Royal Navy in 1776. As Charleston blazed a path towards secession to...
Astonishing biodiversity exists in Congaree National Park, the largest intact expanse of old growth bottomland hardwood forest remaining in the southeastern United States. Waters from the Congaree and...
12 mi from route
~29 min detour
Free
near mile 89.2
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This drive is 85% highway, so expect a lot of time on high-speed roads. The longest continuous stretch on I 26 spans 139.1 miles, meaning you'll have a substantial period of uninterrupted driving. Eventually, you'll transition to surface roads like Whitmire Highway, where the pace will naturally slow. Keep an eye out for the shift in traffic patterns as you move from the interstate environment to more localized routes.
85% highway — fuel and pacing are the main things to plan.
18 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 139.1 mi on I 26.
How Hard Is This Drive?
8/10
This is a straightforward highway drive that stays mostly on I 26 and Whitmire Highway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 30.1 miles in near I 26.
Driving Effort8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 13 significant decision points across 184.7 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 30.1 miles (I 26): Merge point - match speed before joining. Lane positioning matters here; at 66.3 miles (I 26): Highway fork - watch signs carefully. Lane positioning matters here; at 169.2 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 Union, SC and Mount Pleasant, SC, road signs point toward Charleston and Hanahan.
Mount Pleasant is a large town in the Greater Charleston region of South Carolina. The population of the town has exploded, making it a very popular bedroom community of the city of Charleston.
Doable as a same-day drive at 3h 34m. Total distance: 184.7 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
3h 34m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (85%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 139.1 miles on I 26. The full list of main roads is in the Roads section above.
Yes — we found about 16 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
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 Mount Pleasant, SC 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. There are 16 rest areas along the route for bathroom stops.
The main spots that need attention: at 30.1 miles (I 26): Merge point - match speed before joining. Lane positioning matters here; at 66.3 miles (I 26): Highway fork - watch signs carefully. Lane positioning matters here; at 169.2 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Fort Sumter and Fort Moultrie National Historical Park and Congaree National Park. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 3.6 hours each way, an in-and-out day trip would put you behind the wheel for 7.2 hours — manageable with a long break at Mount Pleasant, SC, but most travelers stay overnight.
