How far is Gillette, WY from Thermopolis, WY?
The driving distance from Gillette, WY to Thermopolis, WY is about 194.5 miles (313 km), with a travel time of about 04h 06m by car.
- The straight-line flight distance is about 141.9 miles (228.4 km).
- For a round trip, plan for roughly 08h 13m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM MDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 04h 06m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in and county seat of Johnson County, Wyoming, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Sunny
Driving Route Map
The map below follows the saved road route between Gillette and Thermopolis.
Turn-by-Turn Driving Directions
Step-by-step road directions between Gillette and Thermopolis.
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1
Start on East 4th Street
2116 ft · 1 min · East 4th Street
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2
Turn right onto South Douglas Highway
1.2 km · 2 min · South Douglas Highway
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3
Take the ramp right
67.4 mi · 1 hr 5 min
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4
Take the exit slight right toward US 16, I 90 Business: Buffalo Ucross
1112 ft · 34 sec
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5
Turn left onto US Highway 16 East
1.6 mi · 2 min · US Highway 16 East
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6
Continue on East Hart Street
1 km · 1 min · East Hart Street
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7
At the end of the road, turn left onto North Main Street
2195 ft · 41 sec · North Main Street
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8
Turn right onto Fort Street
96.9 mi · 2 hr 22 min · Fort Street
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9
Continue straight
25.9 mi · 32 min
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10
Continue on North 6th Street
1608 ft · 49 sec · North 6th Street
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11
Arrive at your destination
0 m · 1 sec · South 6th Street
Car Route Details
A richer read on the saved driving route between Gillette and Thermopolis.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
Fort Street
Turn right onto Fort Street
96.9 mi · 02h 22m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Mostly Sunny leaving Gillette and Sunny near Thermopolis.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Gillette to Thermopolis?
The road trip is about 194.5 miles (313 km) and usually takes 04h 06m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Buffalo is a useful midpoint, sitting about 97.1 miles from Gillette and 97.4 miles from Thermopolis.
How much longer is the road route than the straight-line distance?
The direct path is about 141.9 miles (228.4 km), while the road route adds roughly 52.6 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM MDT. If you want a more comfortable same-day return, try to leave by 8:46 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $26.71 one way or $53.41 round trip. Estimated CO2 is about 61 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Gillette and Sunny near Thermopolis.
Flight Path Map
This map shows the direct air route between Gillette and Thermopolis. Straight-line distance: 141.92 mi (228.4 km).
#1 Gillette
City in Campbell County, Wyoming, United States
| Population | 32,220 |
| Coordinates | 44.2910900, -105.5022200 |
| Altitude | 1388 |
| Country | United States |
#2 Thermopolis
Town of the United States
| Population | 2,770 |
| Coordinates | 43.6460700, -108.2120400 |
| Altitude | 1320 |
| Country | United States |
End: Thermopolis (-108.21204, 43.64607)
Estimated Travel Time
Distance: 313 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 28m |
| 40 mph (64.37 km/h) | 04h 51m |
| 50 mph (80.47 km/h) | 03h 53m |
| 60 mph (96.56 km/h) | 03h 14m |
| 70 mph (112.65 km/h) | 02h 46m |
| 80 mph (129 km/h) | 02h 25m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $26.71 | $53.41 |
| Mid-grade | $4.23 | $29.02 | $58.05 |
| Premium | $4.55 | $31.21 | $62.41 |
| Diesel | $5.41 | $37.13 | $74.25 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Wyoming · Apr 23, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.