via I-90
The drive from Boise to Billings takes approximately 7h 45min, covering 540 miles via I-90. Under normal conditions, expect to spend around $63 on gas.
Travel time can vary — during peak hours, weekends, or holidays, the journey may take 10–11+ hours. For the fastest trip, leave early morning (before 7 AM) or travel on weekday evenings.
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 Boise to Billings, 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 5m 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:
Heading from Boise to Billings? This 540-mile long road trip via I-90 takes roughly 7h 45min in typical traffic. Budget around $63 for gas, and aim to leave during late evening (8-10 pm) to minimize delays and enjoy a stress-free drive.
At 540 miles, this cross-country journey deserves careful planning. Consider breaking it into two or more days, booking hotels along the route, and mapping out fuel stops in advance — especially through rural stretches. Popular stopping points include Big Sky, Yellowstone, Grand Teton — great options for grabbing a meal, fueling up, or stretching your legs.