Southport, IN to Portage, IN is 164.5 miles and takes about 3h 10m via I 65, I 74, and Central Avenue, with a fuel budget near $26 and enough daylight to finish in a day. This trip stays within Indiana, traversing the Midwest region from start to finish. With a highway-focused profile, this route is designed for efficient travel. It's a straightforward drive, ideal for those looking to cover ground without extensive detours. You'll find this route practical for a single-day journey, allowing you to reach your destination with ample time.
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
82.2 miles from Southport, IN
A natural place for your longest stop of the day
, about 1h 34m into the drive
.
Main Roads
Road
Distance
Duration
I 65
135.4 mi
2h 27m
I 74
10.8 mi
12m
Central Avenue
5.7 mi
11m
65
3.9 mi
4m
I 69
2.3 mi
2m
US 31
2.2 mi
3m
East Southport Road
1 mi
2m
US 52
0.2 mi
<1m
Longest stretch:
I 65
— 135.4 mi, about 2h 27m
Turn-by-Turn Driving Directions
Step-by-step road directions between Southport, IN and Portage, IN.
1
Start on this road
51 ft·4 sec·this road
2
Turn right onto East Southport Road
1.0 mi·2 min·East Southport Road
3
Turn right onto US 31
2.1 mi·3 min·US 31
Use the left / straight lanes.
4
Take the ramp onto US 31
0.1 mi·13 sec·US 31
Toward I 465 West, I 74 West, I 465 East, I 74 East, US 31 NorthUse the straight / slight right lanes.
5
Keep slight left at fork
0.3 mi·40 sec
Toward I 465 West, I 74 WestUse the slight left lane.
6
Merge onto I 69; I 74; I 465
2.3 mi·2 min·I 69; I 74; I 465
Use the straight / slight right lanes.
7
Keep slight left at fork onto I 74; I 465
11 mi·12 min·I 74; I 465
Use the straight / slight right lanes.
8
Keep slight left at fork onto 65
3.9 mi·4 min·65
Use the straight lane.
9
Take the exit
1.1 mi·2 min
Exit 20Toward I 65 North: ChicagoUse the slight left lane.
10
Merge onto I 65
18 mi·19 min·I 65
Use the straight / slight right lanes.
11
Take the exit onto US 52
0.2 mi·15 sec·US 52
Exit 141Toward US 52 West
12
Keep slight left at fork
0.1 mi·9 sec
13
Merge onto I 65
118 mi·2 hr 8 min·I 65
Use the straight / slight right lanes.
14
Take the exit
0.9 mi·1 min
Exit 259BToward I 80 East, I 94 East, US 6 East: Toledo, DetroitUse the slight right lane.
15
Keep slight right at fork
0.3 mi·37 sec
Exit 13Toward Central AvenueUse the slight right lane.
16
Turn right onto Central Avenue
4.3 mi·8 min·Central Avenue
17
Continue on Central Avenue
1.4 mi·3 min·Central Avenue
18
Arrive at destination
Central Avenue
Trip Plan
Given the relatively short duration of 3 hours and 10 minutes, this trip is easily manageable in a single day. Leaving Southport, IN in the morning will allow you to arrive in Portage, IN well before evening. You'll encounter one recommended stop along the way, which is ample for this distance. Keep an eye on your fuel gauge, as the longest stretch without a major exit opportunity is over 135 miles on I 65. Planning your fuel stop before this long segment will ensure a smooth continuation of your drive.
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 82.2 miles from Southport, IN, or about 1h 34m into the drive.
The longest continuous stretch on this route runs about 135.4 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 36 miles or 44m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 82.2 miles or 1h 34m 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 31m
Traffic, exits, and arrival timing usually matter more near Portage, IN than in the middle of the route.
Before You Leave
+
Open the route before leaving Southport, IN 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 Southport, IN
This is one driving day of about 164.5 miles and 3h 10m.
Your first comfortable stop window is around 36 miles from Southport, IN.
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 65 for about 135.4 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 14
5 decision points cluster between mile 3.2 and 158.5 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
6
3.2 mi into trip|~5m in|US 31
Take the ramp onto US 31 toward I 465 West, I 74 West, I 465 East, I 74 East, US 31 North
Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward I 465 West, I 74 West, I 465 East, I 74...
8
3.3 mi into trip|~5m in
Keep slight left at fork toward I 465 West, I 74 West
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left lane.
Toward I 465 West, I 74 West
7
20.7 mi into trip|~26m in
Take the exit toward I 65 North: Chicago
Exit ramp - move to the correct lane early. Lane positioning matters here
Use the slight left lane.
Exit 20
Toward I 65 North: Chicago
8
157.6 mi into trip|~2h 56m in
Take the exit toward I 80 East, I 94 East, US 6 East: Toledo, Detroit
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Exit 259B
Toward I 80 East, I 94 East, US 6 East: Toledo,...
8
158.5 mi into trip|~2h 58m in
Keep slight right at fork toward Central Avenue
Highway fork - watch signs carefully. Lane positioning matters here
Use the slight right lane.
Exit 13
Toward Central Avenue
Fuel & Cost
Regular Gas
$25.72 one way
$51.44 round trip
$3.97/gal25.4 MPG avg58 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.36
$28.24
$56.47
premium
$4.89
$31.66
$63.31
diesel
$5.61
$36.32
$72.64
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$26
Meals
$25–$50
Total
$51–$76
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 57.6 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $17 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
49.4
0
$17.27
$7.90
Efficient EV
41.1
0
$14.39
$6.58
EV Truck/SUV
65.8
0
$23.03
$10.53
Gas CO2
58 kg
EV CO2
19 kg (67% 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 15, 2026
Origin
Southport, IN
Late night
in Southport on Sunday
Local time
3:35 AM
EDT
Current temp
74°F
Unavailable
Live forecast
Destination
Portage, IN
Late night
in Portage on Sunday
Local time
2:35 AM
CDT
Current temp
50°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
1 hour earlier
The destination clock does not match departure time, so double-check hotel check-in windows and late arrival plans.
Temperature spread
24 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 10m 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.
Indiana Dunes National Park
National Park
Lake Michigan's might has influenced Indiana Dunes for millennia. Wind and waves have shaped the land, leaving a rich mosaic of habitats along these 15 miles of Indiana coast. Over 50 miles of trails...
6 mi from route
~15 min detour
$20
near mile 164.5
Park Closure: Partial Closures to Marquette Greenway Trail and Glenwood Dunes Trail
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
This is a predominantly highway-focused drive, with 92% of the route utilizing major interstates. You'll experience long stretches of consistent speed, including a significant 135.4-mile segment primarily on I 65. While the majority of the journey is on high-speed roadways, there are brief transitions onto roads like Central Avenue, offering a slight change of pace. Expect a driving experience characterized by efficiency rather than winding scenic byways.
92% 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: 135.4 mi on I 65.
How Hard Is This Drive?
9/10
This is a straightforward highway drive that stays mostly on I 65 and I 74. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 3.2 miles in near US 31.
Driving Effort9/10
High effort - long or complex enough to need steady focus all day
Balances navigation complexity with total wheel time.
This is a demanding drive. With 14 significant decision points across 164.5 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 3.2 miles (US 31): Lane positioning matters here. Multiple destination signs - pick the right one; at 3.3 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 20.7 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 3h 10m. Total distance: 164.5 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
3h 10m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (92%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 135.4 miles on I 65. The full list of main roads is in the Roads section above.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
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 Portage, IN 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. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 3.2 miles (US 31): Lane positioning matters here. Multiple destination signs - pick the right one; at 3.3 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 20.7 miles: Exit ramp - move to the correct lane early. Lane positioning matters here.
Yes — Indiana Dunes National Park. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 3.2 hours each way, an in-and-out day trip would put you behind the wheel for 6.3 hours — manageable with a long break at Portage, IN, but most travelers stay overnight.
