Answer: It depends from where you are at the US/Canada border or where you are going to on the US/Mexico border.It is 1381.29 miles (2223 kilometers) from Blaine,Washington to San Ysidro,California. On the other hand the distance from Pembina,North Dakota to Brownsville,Texas is 1843.51 miles or 2940.2 kilometers.
Answer: It is not 100 miles. By road from the Tijuana crossing it is less than 75 miles by road along the coast, according to MS Streets & Trips. As the crow flies, Ensenada is just under 50 miles from the closest point on the US border.