How far is Thermopolis, WY from Gillette, WY?
The driving distance from Thermopolis, WY to Gillette, WY is about 192.9 miles (310.5 km), with a travel time of about 03h 27m by car.
- The straight-line flight distance is about 141.9 miles (228.4 km).
- For a round trip, plan for roughly 06h 55m 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 03h 27m.
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.
Sunny
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Thermopolis and Gillette.
Turn-by-Turn Driving Directions
Step-by-step road directions between Thermopolis and Gillette.
-
1
Start on South 6th Street
1608 ft · 53 sec · South 6th Street
-
2
Continue on Park Street
35.7 mi · 45 min · Park Street
-
3
Continue straight
87.1 mi · 2 hr 9 min
-
4
At the end of the road, turn left onto North Main Street
2195 ft · 41 sec · North Main Street
-
5
Turn right onto East Hart Street
1 km · 57 sec · East Hart Street
-
6
Continue on US Highway 16 East
1.4 mi · 2 min · US Highway 16 East
-
7
Take the ramp slight right toward I 90 East: Gillette
1418 ft · 35 sec
-
8
Merge slight left
65.1 mi · 1 hr 5 min
-
9
Take the exit slight right
1875 ft · 48 sec
-
10
Turn left onto Skyline Drive
944 ft · 27 sec · Skyline Drive
-
11
Turn slight right
1.2 mi · 3 min
-
12
Turn right onto South Warren Avenue
719 ft · 34 sec · South Warren Avenue
-
13
Turn left onto West 4th Street
852 ft · 32 sec · West 4th Street
-
14
Arrive at your destination
0 m · 1 sec · East 4th Street
Car Route Details
A richer read on the saved driving route between Thermopolis and Gillette.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
Park Street
Continue straight
87.1 mi · 02h 09m
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.
Sunny leaving Thermopolis and Mostly Sunny near Gillette.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Thermopolis to Gillette?
The road trip is about 192.9 miles (310.5 km) and usually takes 03h 27m 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 96.3 miles from Thermopolis and 96.6 miles from Gillette.
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 51 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 10:04 AM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $26.51 one way or $53.02 round trip. Estimated CO2 is about 60.5 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Thermopolis and Mostly Sunny near Gillette.
Flight Path Map
This map shows the direct air route between Thermopolis and Gillette. Straight-line distance: 141.92 mi (228.4 km).
#1 Thermopolis
Town of the United States
| Population | 2,770 |
| Coordinates | 43.6460700, -108.2120400 |
| Altitude | 1320 |
| Country | United States |
#2 Gillette
City in Campbell County, Wyoming, United States
| Population | 32,220 |
| Coordinates | 44.2910900, -105.5022200 |
| Altitude | 1388 |
| Country | United States |
End: East 4th Street (-105.502224, 44.291248)
Estimated Travel Time
Distance: 311 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 25m |
| 40 mph (64.37 km/h) | 04h 49m |
| 50 mph (80.47 km/h) | 03h 51m |
| 60 mph (96.56 km/h) | 03h 12m |
| 70 mph (112.65 km/h) | 02h 45m |
| 80 mph (129 km/h) | 02h 24m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $26.51 | $53.02 |
| Mid-grade | $4.23 | $28.81 | $57.63 |
| Premium | $4.55 | $30.98 | $61.96 |
| Diesel | $5.41 | $36.86 | $73.71 |
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.