To find cheap flights from Oakland International Airport (OAK) to Kahului Airport (OGG) in June, be flexible on travel dates and depart midweek where possible. Use fare alerts, flexible-date search tools, and compare flights from nearby airports such as San Francisco (SFO) and San Jose (SJC) to find lower fares. Consider one-stop itineraries via Los Angeles (LAX), San Diego (SAN), or Seattle (SEA) when nonstop fares are high; sometimes adding a short connection saves several hundred dollars. Sign up for airline newsletters and watch for flash sales from Southwest, Alaska, and other carriers that serve OAK and Maui. Book earlier for weekend trips and holiday weekends in June to avoid premium pricing. CTA: Compare OAK to OGG June fares now and set alerts to lock a cheap flight.