Unicoi, TN to East Chattanooga, TN is 219.5 miles and takes about 4h 9m via I-81 and I-75, with a fuel budget near $34 and enough daylight to finish in a day. This drive stays within Tennessee, moving from the Southeast region to another part of the Southeast. Given its profile, this is mostly a highway route, making it a straightforward trip for a single day. You'll find it's a practical option for getting between these two points efficiently.
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
109.8 miles from Unicoi, TN
A natural place for your longest stop of the day
, about 2h 3m into the drive
.
Main Roads
Road
Distance
Duration
I 75
77.1 mi
1h 23m
I 81
57.1 mi
1h 1m
I 40
52.8 mi
59m
James H. Quillen Parkway
23 mi
27m
Bonny Oaks Drive
6.5 mi
11m
Unicoi Drive
0.7 mi
1m
Campbell Street
0.6 mi
1m
US 11
0.5 mi
1m
Longest stretch:
I 75
— 77.1 mi, about 1h 23m
Turn-by-Turn Driving Directions
Step-by-step road directions between Unicoi, TN and East Chattanooga, TN.
1
Start on SR 173
0.7 mi·1 min·Unicoi Drive
2
Turn left onto SR 173
0.3 mi·30 sec·SR 173
3
Take the ramp
0.3 mi·45 sec
4
Merge onto I 26; US 19W; US 23
23 mi·27 min·James H. Quillen Parkway
5
Take the exit
0.2 mi·37 sec
Exit 8AToward I 81 South: Knoxville
6
Merge onto I 81
56 mi·1 hr·I 81
7
Continue on I 81
0.7 mi·45 sec·I 81
Exit 1BToward I 40 West: Knoxville
8
Merge onto I 40
53 mi·59 min·I 40
Use the straight / slight right lanes.
9
Keep slight left at fork onto I 75
77 mi·1 hr 23 min·I 75
Toward I 75 South: Chattanooga
10
Take the exit onto US 11; US 64; SR 317
0.2 mi·44 sec·US 11; US 64; SR 317
Toward Secondary SR 317 West, US 11 South, US 64 West: Bonny Oaks Drive, Old Lee HighwayUse the slight right lane.
11
Keep slight right at fork onto US 11; US 64; SR 317
0.2 mi·24 sec·US 11; US 64; SR 317
12
Continue on TN 317
4.8 mi·8 min·Bonny Oaks Drive
13
Continue on SR 17
1.8 mi·3 min·Bonny Oaks Drive
14
Continue on SR 17
0.6 mi·1 min·Campbell Street
15
Turn right onto SR 17
0.3 mi·38 sec·Glass Street
16
Turn left onto North Chamberlain Avenue
52 ft·1 sec·North Chamberlain Avenue
17
Arrive at destination
North Chamberlain Avenue
Trip Plan
For this 219.5-mile drive, leaving Unicoi in the morning will give you ample time to reach East Chattanooga before evening. With a duration of just over 4 hours, you likely won't need more than one planned stop for fuel or a quick break. The longest stretch without exiting is over 77 miles, so ensure you have sufficient fuel before embarking on that segment of I-75. Since this is a relatively short, highway-focused trip, you have the flexibility to depart at your convenience.
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 109.8 miles from Unicoi, TN, or about 2h 3m into the drive.
The longest continuous stretch on this route runs about 77.1 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 48 miles or 55m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 109.8 miles or 2h 3m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 20m
Traffic, exits, and arrival timing usually matter more near East Chattanooga, TN than in the middle of the route.
Before You Leave
+
Open the route before leaving Unicoi, TN 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 Unicoi, TN
This is one driving day of about 219.5 miles and 4h 9m.
Your first comfortable stop window is around 48 miles from Unicoi, TN.
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 75 for about 77.1 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 11
5 decision points cluster between mile 24.3 and 211.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
24.3 mi into trip|~29m in
Take the exit toward I 81 South: Knoxville
Exit ramp - move to the correct lane early
Exit 8A
Toward I 81 South: Knoxville
5
81.6 mi into trip|~1h 31m in|I 40
Merge onto I 40
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
5
134.4 mi into trip|~2h 31m in|I 75
Keep slight left at fork onto I 75 toward I 75 South: Chattanooga
Highway fork - watch signs carefully
Toward I 75 South: Chattanooga
7
211.5 mi into trip|~3h 54m in|US 11; US 64; SR 317
Take the exit onto US 11; US 64; SR 317 toward Secondary SR 317 West, US 11 South, US 64 West: Bonny Oaks Drive, Old Lee Highway
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Toward Secondary SR 317 West, US 11 South, US 6...
5
211.8 mi into trip|~3h 55m in|US 11; US 64; SR 317
Keep slight right at fork onto US 11; US 64; SR 317
Highway fork - watch signs carefully
Fuel & Cost
Regular Gas
$34.32 one way
$68.63 round trip
$3.97/gal25.4 MPG avg77 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.36
$37.68
$75.36
premium
$4.89
$42.24
$84.48
diesel
$5.61
$48.46
$96.93
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$34
Meals
$25–$50
Total
$59–$84
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 76.8 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $23 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
65.9
0
$23.05
$10.54
Efficient EV
54.9
0
$19.21
$8.78
EV Truck/SUV
87.8
1
$30.73
$14.05
Gas CO2
77 kg
EV CO2
26 kg (66% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
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
Unicoi, TN
Morning
in Unicoi on Tuesday
Local time
6:28 AM
EDT
Current temp
67°F
Unavailable
Live forecast
Destination
East Chattanooga, TN
Morning
in East Chattanooga on Tuesday
Local time
6:28 AM
EDT
Current temp
78°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
11 degrees warmer at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
4h 9m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
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.
Great Smoky Mountains National Park
National Park
Ridge upon ridge of forest straddles the border between North Carolina and Tennessee in Great Smoky Mountains National Park. World renowned for its diversity of plant and animal life, the beauty of it...
28 mi from route
~70 min detour
Free
near mile 90.8
Park Closure: Ramsey Prong Road and Ramsey Cascade Trail Closed
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 drive, with 96% of the route on interstates. You'll experience a long stretch of 77.1 miles on I-75, so expect a good amount of uninterrupted cruising. The transition from highway to surface roads will be minimal, occurring very late in the trip. Be prepared for a high volume of exits and potential merging traffic as you approach East Chattanooga.
96% highway — fuel and pacing are the main things to plan.
17 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 77.1 mi on I 75.
How Hard Is This Drive?
5/10
This is a straightforward highway drive that stays mostly on I 75 and I 81. You will hit about 11 points where you need to pay attention to lane position or signs. The trickiest moment comes around 24.3 miles in.
Driving Effort5/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 219.5 miles you will encounter 11 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 24.3 miles: Exit ramp - move to the correct lane early; at 81.6 miles (I 40): Merge point - match speed before joining. Lane positioning matters here; at 134.4 miles (I 75): Highway fork - watch signs carefully.
Doable as a same-day drive at 4h 9m. Total distance: 219.5 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
4h 9m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (96%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 77.1 miles on I 75. The full list of main roads is in the Roads section above.
Yes — we found about 25 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.
Yes, with realistic expectations. Build in a stop roughly every 2 hours, have snacks and activities ready, and check the Nearby Places tabs for kid-friendly stops along the way.
The main spots that need attention: at 24.3 miles: Exit ramp - move to the correct lane early; at 81.6 miles (I 40): Merge point - match speed before joining. Lane positioning matters here; at 134.4 miles (I 75): Highway fork - watch signs carefully.
Yes — Great Smoky Mountains National Park. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 4.2 hours each way, an in-and-out day trip would put you behind the wheel for 8.3 hours — manageable with a long break at East Chattanooga, TN, but most travelers stay overnight.
