via I-15
The drive from Billings to Denver takes approximately 8h, covering 550 miles via I-15. Under normal conditions, expect to spend around $64 on gas.
Travel time can vary — during rush hour or bad weather, the journey may take 11–12+ hours. For the fastest trip, avoid peak commute hours.
Traffic is usually worst during weekday rush hours (7–9 AM, 4–7 PM) and holiday weekends.
Plan rest stops every 2-3 hours on longer drives. Check traffic conditions before departure and keep your tank above quarter-full.
This trip can typically be done on a single tank of gas.
For a long drive like Billings to Denver, plan to depart early in the morning. This lets you cover most of the distance before afternoon traffic builds up. Consider breaking the trip with a lunch stop midway.
✈️ Flying is faster when you factor in airport time. Flight time is ~1h 6m but add ~2.5 hours for check-in, security, and boarding.
Estimated times and prices. Bus/train availability varies by route. Driving gives the most flexibility for stops and schedules.
Popular cities along the route for rest, food, or fuel:
The long road trip from Billings to Denver follows I-15 for 550 miles, with an estimated travel time of 8h under normal conditions. Fuel costs run approximately $64 at current prices, assuming average fuel efficiency of 30 MPG. Weekday mid-day is generally the best window to depart for the smoothest ride.
This is a serious 550-mile road trip that spans multiple states and regions. Plan for at least one overnight stop, pack emergency supplies, and make sure your vehicle is road-trip ready with fresh oil and properly inflated tires. Popular stopping points include Casper, Laramie, Cheyenne — great options for grabbing a meal, fueling up, or stretching your legs.