Driving across the USA: picking your coast-to-coast route
The three classic cross-country corridors compared, what a coast-to-coast drive really costs in days, and the passes and bookings that matter.
2 min read 2 sections 3 questions answered
Coast to coast across the United States is about 4,500 km whichever way you slice it, and the interstate will do it in 42 hours of driving that you will remember as a blur. The trip only becomes a story when you pick a corridor for what is on it. There are three classics, and they are genuinely different trips.
The three corridors
- North (I-90): the parks route. Chicago, the Badlands, the Black Hills, then Yellowstone and Grand Teton before the Cascades. Best June to September; big passes and bigger weather the rest of the year. See the Yellowstone and Grand Teton guides.
- Middle (I-70 and US 50): the mountain route. Denver, the Rockies, then the run of Utah red rock: Arches, Canyonlands, Capitol Reef. The highest interstate country in the system, gorgeous and occasionally closed by snow well into spring.
- South (I-40): the Route 66 route. Oklahoma's neon bones, New Mexico's high desert, the Grand Canyon an hour off the highway, then the Mojave. The winter-proof choice, and a furnace in July.
The honest numbers
- 1 Two weeks is the comfortable minimum for a coast-to-coast with real stops. Ten days works on the southern route; three weeks turns any corridor into a proper trip.
- 2 Budget fuel by thirds: the coasts are expensive, the middle is cheap, and a smaller thirstier rental changes the math less than route choice does.
- 3 Buy the America the Beautiful pass if you will hit three or more national parks; it covers entry at all of them for a year ($80, checked August 2026).
- 4 Book the park lodges and campgrounds first and hang the rest of the route on them; everything outside the parks can be booked two days out.
- 5 Watch the time zones: four of them, and the hour you gain each week is the best free lunch in road tripping.
Location: Badlands National Park, I-90 corridor
Location: Arches National Park, I-70 corridor
The bookings that sell out
- Recreation.gov Federal campgrounds and the timed-entry permits some parks require. https://www.recreation.gov
- America the Beautiful pass The annual pass covering entry to every US national park. https://www.nps.gov/planyourvisit/passes.htm
- National Park Service Conditions, closures and reservation requirements, park by park. https://www.nps.gov
Common questions
- How long does it take to drive across the United States?
- About 42 to 46 hours of driving on the interstate, which is a week of hard days with nothing seen. Two weeks is the comfortable minimum with stops; three weeks makes it the trip people actually rave about.
- Which cross-country route is best?
- It depends what you want dense: I-90 for national parks and northern scenery in summer, I-70 for mountains and Utah red rock, I-40 for desert, Route 66 nostalgia and winter reliability. There is no wrong answer, only wrong seasons.
- How much does a cross-country road trip cost in gas?
- A typical car doing 4,500 km plus detours burns roughly 500 to 600 litres. At recent US prices that lands in the few-hundred-dollar range rather than the four-figure range, and detours, not the crossing itself, are what move the number.
Tip
Coming from Canada? The border crossing guide covers the documents and the questions at the booth.