Johnson City, TN to Union, TN is 200.6 miles and takes about 3h 52m via I 75, I 81, and I 40, with a fuel budget near $31 and enough daylight to finish in a day. This trip stays within the Southeast region, entirely within Tennessee. Expect a primarily highway-focused drive that makes for a straightforward journey. Given the relatively short duration and high highway share, this route is ideal for a single-day trip, allowing you to reach your destination without needing an overnight stop.
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
100.3 miles from Johnson City, TN
A natural place for your longest stop of the day
, about 1h 52m into the drive
.
Who Is This Route For?
Weekend Trip
Doable as a same-day drive at 3h 52m. Total distance: 200.6 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
3h 52m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (91%). Some complex stretches to watch for.
Drive Character
This route is predominantly a highway-focused drive, with 91% of the journey on major interstates like I 75, I 81, and I 40. You'll experience mostly fast-paced driving, punctuated by a longest stretch of 59.9 miles on I 75. The road character remains consistent for the majority of the trip, offering a smooth and efficient travel experience. While it's a highway-heavy route, the transitions between the interstates are generally well-managed, keeping your momentum up.
Most of the miles stay on highways, which makes pacing and fuel planning easier than turn-by-turn city driving.
There are about 23 navigation steps in the underlying route data, so the final approach matters more than the middle miles.
I 75 is the longest continuous segment at about 59.9 miles.
How Hard Is This Drive?
This is a straightforward highway drive that stays mostly on I 75 and I 81. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 0.1 miles in near Buffalo Street.
Driving Effort7/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 15 significant decision points across 200.6 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 0.1 miles (Buffalo Street): Lane positioning matters here; at 0.4 miles (North Roan Street): Lane positioning matters here; at 15 miles: Exit ramp - move to the correct lane early.
Critical Maneuvers
5 of 15 key points
These are the spots where you need to pay the most attention. Preview them before you drive.
6
0.1 mi into trip|~0m in|Buffalo Street
Turn left onto Buffalo Street
Lane positioning matters here
Use the straight lane.
7
0.4 mi into trip|~1m in|North Roan Street
Turn left onto North Roan Street
Lane positioning matters here
Use the left lane.
5
15 mi into trip|~19m 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
72.3 mi into trip|~1h 21m in|I 40
Merge onto I 40
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
5
125.1 mi into trip|~2h 20m 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
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 Johnson City, TN to Union, TN, road signs begin pointing toward Dayton along the way.
Dayton
185 mi in|~3h 25m
Main Roads
Road
Distance
Duration
I 75
59.9 mi
1h 4m
I 81
57.1 mi
1h 1m
I 40
52.8 mi
59m
James H. Quillen Parkway
13.7 mi
16m
Spring Place Road Southeast
8.4 mi
14m
25th Street Northwest
3.5 mi
5m
Hughes Lake Road Southeast
1.3 mi
3m
Appalachian Highway
1.2 mi
1m
Longest stretch:
I 75
— 59.9 mi, about 1h 4m
Turn-by-Turn Driving Directions
Step-by-step road directions between Johnson City, TN and Union, TN.
1
Start on this road
433 ft·35 sec·this road
2
Turn left onto Buffalo Street
0.3 mi·56 sec·Buffalo Street
Use the straight lane.
3
Turn left onto North Roan Street
0.3 mi·36 sec·North Roan Street
Use the left lane.
4
Turn right onto SR 400
0.3 mi·45 sec·East Watauga Avenue
5
Turn left onto Oak Street
441 ft·10 sec·Oak Street
6
Take the ramp
0.2 mi·23 sec
7
Merge onto I 26; US 19W; US 23
14 mi·16 min·James H. Quillen Parkway
8
Take the exit
0.2 mi·37 sec
Exit 8AToward I 81 South: Knoxville
9
Merge onto I 81
56 mi·1 hr·I 81
10
Continue on I 81
0.7 mi·45 sec·I 81
Exit 1BToward I 40 West: Knoxville
11
Merge onto I 40
53 mi·59 min·I 40
Use the straight / slight right lanes.
12
Keep slight left at fork onto I 75
60 mi·1 hr 4 min·I 75
Toward I 75 South: Chattanooga
13
Take the exit
0.2 mi·27 sec
Toward SR 60: Cleveland, Dayton
14
Turn right onto TN 60
0.2 mi·20 sec·Georgetown Road Northwest
15
Continue on TN 60
0.1 mi·12 sec·25th Street Northwest
16
Continue on TN 60
0.6 mi·59 sec·25th Street NW
17
Continue on TN 60
3.4 mi·5 min·25th Street Northwest
18
Continue on US 74; US 64 Bypass; TN 60
1.2 mi·1 min·Appalachian Highway
19
Take the exit
0.2 mi·22 sec
20
Keep slight left at fork
98 ft·7 sec
21
Turn left onto SR 74
8.4 mi·14 min·Spring Place Road Southeast
22
Turn slight right onto Hughes Lake Road Southeast
1.3 mi·3 min·Hughes Lake Road Southeast
23
Arrive at destination
Hughes Lake Road Southeast
Trip Plan
For this 200.6-mile drive, leaving Johnson City in the morning will give you ample time to reach Union comfortably within the 3h 52m estimated duration. With only one recommended stop and a fuel cost around $31, you can easily manage this trip in a single day. The longest uninterrupted stretch is 59.9 miles on I 75, so plan your fuel and restroom breaks accordingly before entering that segment. Keep an eye on the traffic reports, especially if traveling during peak hours, as interstates can experience delays.
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 100.3 miles from Johnson City, TN, or about 1h 52m into the drive.
The longest continuous stretch on this route runs about 59.9 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 44 miles or 51m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 100.3 miles or 1h 52m 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 3m
Traffic, exits, and arrival timing usually matter more near Union, TN than in the middle of the route.
Before You Leave
+
Open the route before leaving Johnson City, 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 Johnson City, TN
This is one driving day of about 200.6 miles and 3h 52m.
Your first comfortable stop window is around 44 miles from Johnson City, 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 59.9 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Halfway Point
Midpoint
About 100.3 mi from Johnson City, TN
· 1h 52m into the drive
The midpoint is around 100.3 miles from Johnson City, TN, which is a good place for a longer meal and fuel stop.
Arriving in Union, TN
The final approach into Union, TN usually feels slower than the middle of the drive, so avoid planning your tightest schedule at the very end.
Try to arrive with enough fuel left to skip an immediate station stop unless you already know the area around Union, TN.
These stop ideas are pacing suggestions — the exact town or exit can change with traffic, hotel plans, and fuel range.
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...
Park data from the National Park Service API. Alerts update every 2 hours.
Fuel & Cost
Regular Gas
$31.36 one way
$62.72 round trip
$3.97/gal25.4 MPG avg70 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.36
$34.43
$68.87
premium
$4.89
$38.60
$77.21
diesel
$5.61
$44.29
$88.58
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$31
Meals
$25–$50
Total
$56–$81
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 70.2 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $21 in charging
· 0 stops
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
60.2
0
$21.06
$9.63
Efficient EV
50.2
0
$17.55
$8.02
EV Truck/SUV
80.2
1
$28.08
$12.84
Gas CO2
70 kg
EV CO2
23 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 18, 2026
Origin
Johnson City, TN
Late night
in Johnson City on Saturday
Local time
1:33 AM
EDT
Current temp
77°F
Unavailable
Live forecast
Destination
Union, TN
Late night
in Union on Saturday
Local time
1:33 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
1 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
3h 52m 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.
Frequently Asked Questions
The drive from Johnson City, TN to Union, TN covers 200.6 miles and takes about 3h 52m without stops. Add 15-30 minutes for a fuel or rest stop on longer drives.
The main roads are I 75, I 81, I 40. Most of the drive stays on highways, so watch for ramps and exits.
This is a comfortable same-day trip.
The midpoint is about 100.3 miles from Johnson City, TN. Look for rest areas, gas stations, or food options near the halfway mark.
At current regular gas prices, expect to spend about $31.36 one way. This estimate uses 25.4 MPG — your actual cost will vary with your vehicle's fuel efficiency and current gas prices.
An early start around 7-8 AM gets you there with plenty of daylight left. A late afternoon start means arriving after dark. Morning is better.
Plan about 1 meaningful break for fuel, food, or rest. A short stop every 2 to 3 hours is enough for this drive.
This is a demanding drive. With 15 significant decision points across 200.6 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.
The main spots that need attention: at 0.1 miles (Buffalo Street): Lane positioning matters here; at 0.4 miles (North Roan Street): Lane positioning matters here; at 15 miles: Exit ramp - move to the correct lane early.
On the drive from Johnson City, TN to Union, TN, road signs begin pointing toward Dayton along the way.
Yes. Nearby national parks include Great Smoky Mountains National Park.
How this page is built
Compiled by the Trip.ovh planning team at COD Solutions Oy from open government datasets — OSRM over OpenStreetMap for geometry, EIA for fuel prices, and NPS for national parks. See our methodology for refresh cadence and limitations.
