SR 218 takes an approach north of Monterey Regional Airport via the cities of Seaside and Del Rey Oaks.

It then exits the city and enters Del Rey Oaks as a 2-lane highway where it shortly meets its east end at California State Route 68.

[3] Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage.

R reflects a realignment in the route since then, M indicates a second realignment, L refers to an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see California postmile § Official postmile definitions).

[1] Segments that remain unconstructed or have been relinquished to local control may be omitted.