Saint Martin to Horn Lake is 356.9 miles and takes about 6h 56m via I 55 and US 49, with a fuel budget near $52 and enough daylight to finish in a day. This drive stays entirely within Mississippi, beginning in the Southeast region and concluding in the same area. Given its predominantly highway profile, expect a straightforward trip focused on covering ground efficiently. It's a solid choice for a single-day transit if you prefer to get to your destination without significant detours.
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
178.5 miles from Saint Martin, MS
A natural place for your longest stop of the day
, about 3h 40m into the drive
.
Main Roads
Road
Distance
Duration
I 55
193.7 mi
3h 29m
US 49
135 mi
2h 46m
MS 15
20.7 mi
24m
Goodman Road West
2.1 mi
3m
Lemoyne Boulevard
1.4 mi
2m
I 110
1.3 mi
1m
Gorenflo Road
0.5 mi
<1m
Hurt Road
0.5 mi
2m
Longest stretch:
I 55
— 193.7 mi, about 3h 29m
Traffic on I-55
Hour-of-day weekday pattern from 57 FHWA count stations on your route.
Peak
4 PM
~2,443 veh/hr typical
Quietest
2 AM
~141 veh/hr
Peak-to-quiet ratio
17.3×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Saint Martin, MS and Horn Lake, MS.
1
Start on Needle Street
505 ft·27 sec·Needle Street
2
Turn left onto Sundown Avenue
0.3 mi·1 min·Sundown Avenue
3
At end of road, turn left onto Lemoyne Boulevard
1.4 mi·2 min·Lemoyne Boulevard
4
Turn left onto Gorenflo Road
0.5 mi·57 sec·Gorenflo Road
5
Turn right onto Rodriguez Street
0.2 mi·35 sec·Rodriguez Street
6
Take the ramp
0.3 mi·37 sec
7
Merge onto I 110
1.3 mi·1 min·I 110
8
Continue on MS 15; MS 67
21 mi·24 min·MS 15; MS 67
Use the straight lane.
9
Keep slight right at fork
0.4 mi·47 sec
Toward US 49 North: Hattiesburg, Jackson
10
Merge onto US 49
40 mi·46 min·US 49
Use the straight lane.
11
Continue on US 49
2.4 mi·2 min·US 49
Use the straight / slight right lanes.
12
Turn straight onto US 49
10 mi·16 min·US 49
Use the straight lane.
13
Continue on US 49; MS 42
5.4 mi·6 min·US 49; MS 42
Use the straight lane.
14
Continue on US 49
5.3 mi·6 min·US 49
Use the straight lane.
15
Continue on US 49
0.2 mi·14 sec·US 49
Use the straight lane.
16
Continue on US 49
4.2 mi·4 min·US 49
Use the straight lane.
17
Continue on US 49
66 mi·1 hr 20 min·US 49
Use the straight lane.
18
Take the exit onto US 49
0.2 mi·21 sec·US 49
19
Keep slight left at fork onto US 49
0.7 mi·1 min·US 49
Toward Jackson
20
Keep slight right at fork onto US 49
0.9 mi·1 min·US 49
21
Merge onto I 55
194 mi·3 hr 29 min·I 55
22
Take the exit
0.3 mi·38 sec
Toward Southaven, Horn Lake, Olive Branch
23
Keep slight left at fork
192 ft·6 sec
Toward Memphis
24
Turn left onto MS 302
2.1 mi·3 min·Goodman Road West
25
Turn left onto Hurt Road
0.5 mi·2 min·Hurt Road
26
Turn right onto Camelot Road
193 ft·8 sec·Camelot Road
27
Arrive at destination
Camelot Road
Trip Plan
Given the 6h 56m duration, leaving Saint Martin in the morning will allow you to reach Horn Lake before evening. While the route has only one recommended stop, you can certainly add more breaks as needed, especially during the 193.7-mile stretch on I 55. Plan your fuel stops strategically; the $52 estimate suggests you'll need to fill up at least once. Since this is a manageable one-day drive, you have flexibility in your departure time.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 178.5 miles from Saint Martin, MS, or about 3h 40m into the drive.
The longest continuous stretch on this route runs about 193.7 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 79 miles or 1h 41m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 178.5 miles or 3h 40m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 5h 48m
Traffic, exits, and arrival timing usually matter more near Horn Lake, MS than in the middle of the route.
Before You Leave
+
Open the route before leaving Saint Martin, MS 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 Martin, MS
This is one driving day of about 356.9 miles and 6h 56m.
Your first comfortable stop window is around 79 miles from Saint Martin, MS.
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 55 for about 193.7 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 17
5 decision points cluster between mile 0.4 and 354.3 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
0.4 mi into trip|~1m in|Lemoyne Boulevard
At end of road, turn left onto Lemoyne Boulevard
Navigation decision point
6
24.9 mi into trip|~32m in
Keep slight right at fork toward US 49 North: Hattiesburg, Jackson
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward US 49 North: Hattiesburg, Jackson
5
25.3 mi into trip|~33m in|US 49
Merge onto US 49
Merge point - match speed before joining. Lane positioning matters here
Use the straight lane.
5
158.7 mi into trip|~3h 17m in|US 49
Keep slight left at fork onto US 49 toward Jackson
Highway fork - watch signs carefully
Toward Jackson
6
354.3 mi into trip|~6h 50m in
Keep slight left at fork toward Memphis
Highway fork - watch signs carefully
Toward Memphis
Fuel & Cost
Regular Gas
$49.54 one way
$99.09 round trip
$3.53/gal25.4 MPG avg125 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$3.95
$55.43
$110.86
premium
$4.29
$60.27
$120.53
diesel
$4.80
$67.39
$134.78
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$50
Meals
$25–$50
Total
$75–$100
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 124.9 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $37 in charging
· 1 stop
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
107.1
1
$37.47
$17.13
Efficient EV
89.2
1
$31.23
$14.28
EV Truck/SUV
142.8
1
$49.97
$22.84
Gas CO2
125 kg
EV CO2
42 kg (66% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
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 Jul 17, 2026
Origin
Saint Martin, MS
Evening
in Saint Martin on Saturday
Local time
8:27 PM
CDT
Current temp
77°F
Partly Cloudy
W 5 mph2% chanceLive forecast
Destination
Horn Lake, MS
Evening
in Horn Lake on Saturday
Local time
8:27 PM
CDT
Current temp
73°F
Mostly Clear
WSW 5 mph1% chanceLive 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
4 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
6h 56m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
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.
Medgar and Myrlie Evers Home National Monument
National Monument
Medgar and Myrlie Evers were partners in the civil rights struggle. The assassination of Medgar Evers in the carport of their home on June 12, 1963, was the first murder of a nationally significant le...
Emmett Till and Mamie Till-Mobley National Monument
National Monument
In 1955, 14-year-old Emmett Till traveled to Money, Mississippi, to visit relatives. He was kidnapped, tortured, and murdered after reportedly whistling at a white woman. His mother, Mamie Till-Mobley...
28 mi from route
~71 min detour
Free
near mile 295.4
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This route is nearly all highway, with 98% of the drive on major roads like I 55 and US 49. You'll experience a long stretch of 193.7 miles on I 55, indicating extended periods of consistent cruising. The transition to surface roads will be minimal, so prepare for continuous highway driving for the vast majority of the trip.
98% highway — fuel and pacing are the main things to plan.
27 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 193.7 mi on I 55.
How Hard Is This Drive?
8/10
This is a straightforward highway drive that stays mostly on I 55 and US 49. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.4 miles in near Lemoyne Boulevard.
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 17 significant decision points across 356.9 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 0.4 miles (Lemoyne Boulevard): Navigation decision point; at 24.9 miles: Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 25.3 miles (US 49): Merge point - match speed before joining. Lane positioning matters here.
Elevation Profile
Mostly flat terrain
411 ft10 ft
Total Climb
578 ft
Total Descent
292 ft
Highest Point
411 ft
~254.9 mi in
Elevation Range
401 ft
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 Martin, MS to Horn Lake, MS, road signs begin pointing toward Jackson along the way.
Doable as a same-day drive at 6h 56m. Total distance: 356.9 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
6h 56m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 193.7 miles on I 55. The full list of main roads is in the Roads section above.
Yes — we found about 15 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 Horn Lake, MS 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 15 rest areas along the route for bathroom stops.
The main spots that need attention: at 0.4 miles (Lemoyne Boulevard): Navigation decision point; at 24.9 miles: Highway fork - watch signs carefully. Multiple destination signs - pick the right one; at 25.3 miles (US 49): Merge point - match speed before joining. Lane positioning matters here.
Yes — Medgar and Myrlie Evers Home National Monument and Emmett Till and Mamie Till-Mobley National Monument. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 6.9 hours each way, a round trip means 13.9 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at Horn Lake, MS before the return drive.
