Common itineraries for San Diego International Airport (SAN) to Clark International Airport (CRK) combine a U.S. domestic carrier (United, American, Alaska) to a major West Coast hub with a transpacific carrier (ANA, Korean Air, Japan Airlines, Philippine Airlines) onward to Clark or nearby Manila. Low-cost Asian carriers may offer competitive pricing but often require separate tickets and stricter baggage rules. Compare total price including checked bags, seat selection, and transfer protection; if peace of mind is a priority, book through-ticket itineraries on alliance partners. For January travel, watch for seasonal promotions from carriers serving the Philippines and consider loyalty programs if you expect multiple segments.