May is a high-demand month for travel between San Francisco International Airport (SFO) and Ontario International Airport (ONT) because of spring vacations and Memorial Day. Expect an uptick in weekly frequencies in the two weeks surrounding Memorial Day; peak travel days are usually the Friday before and Monday after the holiday. For budget-conscious travelers, midweek departures (Tuesdays and Wednesdays) often yield lower fares, while Friday–Sunday trips can be 15–25% higher. Book 3–6 weeks in advance for the best balance of price and availability, use fare alerts, and consider early morning flights for lower rates and fewer delays. Nearby destinations accessible from SFO include San Jose, Oakland, Palo Alto, Napa, and Sacramento; from ONT you can quickly access Los Angeles, Anaheim, Riverside, San Bernardino, Long Beach, and Palm Springs — making SFO→ONT convenient for both business and leisure itineraries.
May arrivals at Ontario International Airport (ONT) are shaped by warm weather and increased leisure travel to theme parks and coastal areas. Travelers landing from San Francisco International Airport (SFO) should be ready for Memorial Day weekend surges and reserve rentals or shared rides in advance. ONT is a practical gateway to Los Angeles, Anaheim (Disneyland/Convention Center), Riverside and the Inland Empire business hubs, as well as beach communities like Long Beach and vacation spots such as Palm Springs. For a smooth arrival, check transit schedules, book rental cars early, and use online parking deals to reduce costs.
Starting from $196
Book your economy class flight from San Francisco (SFO) to Ontario (ONT)and save money on your travel. Compare all flight options to find the best deal for your may trip.
Starting from $356
Book your economy class flight from San Francisco (SFO) to Ontario (ONT)and save money on your travel. Compare all flight options to find the best deal for your may trip.
Planning a trip from San Francisco (SFO) to Ontario (ONT) in may? SlickTrip helps you find the cheapest economy class flights with our comprehensive flight comparison tool. Whether you prefer direct flights for convenience or multi-stop flights for savings, we have options for every budget and schedule.