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
About 325 miles.
3 MILES
Flagstaff is located approximately 145 miles north of Phoenix. The drive between the two cities typically takes around 2 to 2.5 hours, depending on traffic and road conditions.
515 miles
123 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.
It is 864.12 miles according to MapQuest.
222 miles