I assume you mean Barstow, CA and not Barstow, TX.
The Approx. driving time from Flagstaff, AZ to Barstow, CA is about 5.5 hours, if you take I-40.
In terms of road distance, that's about halfway between Barstow and Victorville, California.
far
Halfway between Merced, CA, and Flagstaff, AZ, is approximately near the town of Barstow, CA. This location is situated along Interstate 40, making it a convenient stop for travelers. The distance between the two cities is around 500 miles, so Barstow serves as a good midpoint for rest or refueling.
About 325 miles.
3 MILES
123 miles
515 miles
250 miles
5200
81 miles taking this route:Take the 10 EAST or the 210 EAST from Claremont to I-15 NORTH to BARSTOW at EXIT 58A off the 10, or at EXIT 64A off the 210.Take I-15 NORTH to Barstow.
140 miles
2 hours at least with no traffic.