Bismarck, ND to Gillette, WY: distance, drive time and fuel cost
It is about 333 miles from Bismarck, ND to Gillette, WY, which is roughly 5 hr 33 min behind the wheel. Everything below is an estimate — see how it is worked out at the bottom of the page.
Estimated road distance
333miles
536 km
- Drive time
- 5 hr 33 min
- Average speed
- 60 mph
- Fuel cost
- $41
- Fuel used
- 13.1 gal
What the drive from Bismarck to Gillette is like
The route runs from Bismarck, ND to Gillette, WY, crossing a single state line — North Dakota and Wyoming. Speed limits and everyday driving rules are set state by state, so what is posted can change as you cross. At roughly 5 hr 33 min of driving this is a full day and worth planning as one. Two stops rather than one, and an early start, make the difference between arriving usable and arriving wrecked.
The route also crosses a time-zone boundary, so the clock at the far end is 1 hour behind the one you set off with. Arrival times booked at the destination are in local time, which is the part people get wrong.
Flying this route saves about 2 hr 28 min door to door once airport time is counted, so the drive is a choice rather than the obvious option — worth it if you want the car at the other end, or if you would rather see the 333 miles than sit them out.
What the fuel works out at, and what that figure assumes
333 miles at 25.4 miles per gallon is about 13.1 gallons, which comes to roughly $41 at $3.15 a gallon. Split between four people that is about $10.32 each, which is the comparison worth making before you look at a flight price rather than after. Two figures in that sentence are assumptions rather than facts about your trip: the price per gallon, reviewed 2026-08, and the consumption, which is a US fleet average. Both are published with the rest of the method under fuel cost assumptions.
The size of that assumption is easy to see on this route. A fifty-cent move in the pump price either way changes the total by about $6.55 — so read $41 as the middle of a range from roughly $35 to $48, not as a quote. A car that does noticeably better or worse than 25.4 mpg shifts it further, and neither figure includes tolls, which are charged on a good deal of the interstate network in the northeast and on individual bridges and tunnels elsewhere. Nothing on this page knows which tolls apply to a particular route, so none are counted.
For the same reason the 116 kg of CO₂ this drive implies is arithmetic on the fuel rather than a measurement: 13.1 gallons of gasoline at the EPA's figure of 8.89 kg per gallon. It is useful for comparing this route against flying it, or against a longer way round, and not useful as an absolute number.