Ontario to San Francisco (ONT–SFO) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
ONT–SFO is served by 2 airlines with nonstop service. United Airlines and Frontier lead the route. The flight covers 363 miles in approximately 1h 25m. Beyond nonstop, 55 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| UA United Airlines Also: AC, CM | 44 | 319, 320, 738, 739, 7M9, B39M, E7W | 1h25-1h30 | Star Alliance | AC, CM | |
| F9 Frontier Also: Y4 | 7 | 32N | 1h27 | – | Y4 |
Weekly Schedule Pattern
Connection Landscape
Other ways to reach San Francisco from Ontario
| Metric | ONT→SFO | SBD→SFO | SNA→SFO |
|---|---|---|---|
| Distance from ONT | – | 21 mi | 30 mi |
| Nonstop airlines | 2 | 3 | 21 |
| Weekly flights | 92 | 4 | 288 |
| Flight time | 1h 25m | 1h 34m | 1h |
| Departure OTP | 72% | – | – |
Travel Essentials
ONT: PDT · SFO: PDT
When it's 6:00 PM in Ontario, it's 6:00 PM in San Francisco.
BART from SFO station (free AirTrain from any terminal to the station) to downtown San Francisco takes 30–40 minutes ($10.45 to Embarcadero). Traffic on 101 can make taxis and ride-hails much slower during peak hours; BART skips all of that. BART also reaches Oakland, Berkeley, and Millbrae for Caltrain connections.Ride-hails from SFO use a dedicated garage pickup area; follow signs. Taxis are metered; downtown SF costs $40–60. Caltrain to the Peninsula (Mountain View, Palo Alto, San Jose) requires taking BART to Millbrae station for the transfer. Rental cars are at a consolidated facility accessible by AirTrain.
Coastal fog dominates the climate pattern. The thick marine layer ("Karl the Fog") rolls into SFO from the Pacific regularly in summer (June–September), causing significant low-visibility delays even on days that appear sunny inland. Morning fog burns off by afternoon most days, but persistent IFR conditions can last all day. This is the primary flight disruption risk at SFO.
Temperatures are mild year-round (10–20°C) with little seasonal variation. Winters bring rain (December–March) and occasional atmospheric river events that cause brief but intense flooding on the 101. Summers are cool. Pack a light jacket year-round. Wind off the bay affects small aircraft approach paths.
ONT–SFO Quick Facts
Frequently Asked Questions
Flights from ONT to SFO
Ontario International Airport (ONT) and San Francisco International Airport (SFO) are connected by nonstop service from Frontier and United Airlines. With 92 weekly departures, this is a heavily served route.
ONT to SFO Flight Duration and Schedule
Nonstop flight time from ONT to SFO ranges from 1 hours 25 minutes to 1 hours 40 minutes. The route covers a distance of 363 miles (585 km). There are approximately 92 weekly flights outbound and 78 return, totaling 170 flights per week in both directions.
Connecting Options and Alternatives
55 one-stop connections are available, with the fastest taking approximately 3 hours via VNY. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include San Bernardino (SBD), Santa Ana (SNA) and Hawthorne (HHR).