How far is Thermopolis, WY from Casper, WY?
The driving distance from Thermopolis, WY to Casper, WY is about 133 miles (214.1 km), with a travel time of about 02h 27m by car.
- The straight-line flight distance is about 109.7 miles (176.5 km).
- For a round trip, plan for roughly 04h 54m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM MDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 02h 27m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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.
Town of the 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 Casper.
Turn-by-Turn Driving Directions
Step-by-step road directions between Thermopolis and Casper.
-
1
Start on South 6th Street
2765 ft · 1 min · South 6th Street
-
2
Turn right onto Shoshoni Street
1.4 km · 2 min · Shoshoni Street
-
3
Continue straight
31 mi · 36 min
-
4
Turn left onto East 2nd Street
33.1 mi · 38 min · East 2nd Street
-
5
Continue on West US Highway 20-26
60.7 mi · 1 hr 9 min · West US Highway 20-26
-
6
Turn left
2.7 mi · 3 min
-
7
Take the exit right
2.5 mi · 4 min
-
8
Take the exit slight right toward US 20 East, US 26 East, US 87 South: North Beverly Street, Bryan Stock Trail
1755 ft · 41 sec
-
9
At the end of the road, turn left onto Bryan Stock Trail
1.1 mi · 2 min · Bryan Stock Trail
-
10
Turn left onto East Sunlight Drive
1.5 km · 4 min · East Sunlight Drive
-
11
Arrive at your destination
0 m · 1 sec · North Sunlight Drive
Car Route Details
A richer read on the saved driving route between Thermopolis and Casper.
Straightforward drive
The saved road route has a manageable number of maneuvers and should be easy to follow with normal attention to signs.
West US Highway 20-26
Continue on West US Highway 20-26
60.7 mi · 01h 09m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Sunny leaving Thermopolis and Mostly Sunny near Casper.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Thermopolis to Casper?
The road trip is about 133 miles (214.1 km) and usually takes 02h 27m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Shoshoni is a useful midpoint, sitting about 66.8 miles from Thermopolis and 66.3 miles from Casper.
How much longer is the road route than the straight-line distance?
The direct path is about 109.7 miles (176.5 km), while the road route adds roughly 23.3 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 8:00 AM to 10:00 AM MDT. If you want a more comfortable same-day return, try to leave by 1:36 PM MDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $18.26 one way or $36.52 round trip. Estimated CO2 is about 41.7 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Thermopolis and Mostly Sunny near Casper.
Flight Path Map
This map shows the direct air route between Thermopolis and Casper. Straight-line distance: 109.68 mi (176.52 km).
#1 Thermopolis
Town of the United States
| Population | 2,770 |
| Coordinates | 43.6460700, -108.2120400 |
| Altitude | 1320 |
| Country | United States |
#2 Casper
The most populous city in Natrona County, Wyoming.
| Population | 58,498 |
| Coordinates | 42.8666300, -106.3130800 |
| Altitude | 1560 |
| Country | United States |
End: North Sunlight Drive (-106.309604, 42.868632)
Estimated Travel Time
Distance: 214 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 04h 25m |
| 40 mph (64.37 km/h) | 03h 19m |
| 50 mph (80.47 km/h) | 02h 39m |
| 60 mph (96.56 km/h) | 02h 13m |
| 70 mph (112.65 km/h) | 01h 54m |
| 80 mph (129 km/h) | 01h 39m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $3.89 | $18.26 | $36.52 |
| Mid-grade | $4.23 | $19.84 | $39.69 |
| Premium | $4.55 | $21.33 | $42.67 |
| Diesel | $5.41 | $25.38 | $50.76 |
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.