Ontario (ONT) to San Francisco (SFO) flights
2 airlines fly nonstop from Ontario (ONT) to San Francisco (SFO): Frontier Airlines and United Airlines. The two airports are 364 miles (585 km) apart. United Airlines is in Star Alliance. There are also 5 ways to fly it with one stop, through Sacramento, Las Vegas and Phoenix and more.
Airlines flying nonstop from ONT to SFO
- Frontier AirlinesNot in an allianceWho books it
- United AirlinesStar Alliance · bookable with 13 programsWho books it
Book ONT to SFO with points
Loyalty programs that can book at least one of the nonstop airlines, from the Award Booking Guide.
- Air Canada AeroplanBooks United Airlines
- Air New Zealand AirpointsBooks United Airlines
- ANA Mileage ClubBooks United Airlines
- Avianca LifeMilesBooks United Airlines
- Emirates SkywardsBooks United Airlines
- EVA Air Infinity MileageLandsBooks United Airlines
- JetBlue TrueBlueBooks United Airlines
- Lufthansa Miles & MoreBooks United Airlines
- Singapore Airlines KrisFlyerBooks United Airlines
- TAP Miles&GoBooks United Airlines
- Thai Royal Orchid PlusBooks United Airlines
- Turkish Airlines Miles&SmilesBooks United Airlines
- United MileagePlusBooks United Airlines
ONT to SFO with one stop
5 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Sacramento (SMF)Southwest Airlines and Frontier Airlines, then United Airlines
- Via Las Vegas (LAS)Southwest Airlines and Frontier Airlines the whole way
+1 - Via Phoenix (PHX)American Airlines and Southwest Airlines the whole way
+1 - Via Salt Lake City (SLC)Delta Air Lines the whole way
- Via Boise (BOI)Alaska Airlines the whole way
ONT to SFO: common questions
Which airlines fly nonstop from ONT to SFO?
Frontier Airlines and United Airlines (Star Alliance) fly nonstop from Ontario (ONT) to San Francisco (SFO).
How far is Ontario from San Francisco by plane?
Ontario (ONT) and San Francisco (SFO) are 364 miles (585 km) apart along the great circle, the shortest path a flight can take. Connections add distance on top.
Which points programs can book ONT to SFO award flights?
13 programs can book at least one of the nonstop airlines: Air Canada Aeroplan, Air New Zealand Airpoints, ANA Mileage Club, Avianca LifeMiles, Emirates Skywards, EVA Air Infinity MileageLands, JetBlue TrueBlue, Lufthansa Miles & More and 5 more. Which flights each can book depends on its partners, so check the airline before you transfer points.
How many miles does ONT to SFO cost?
It depends on the program: each prices the route from its own chart or dynamically. The Award Flight Pricer compares 30+ programs for ONT to SFO with taxes and fees.
Where can I connect between Ontario and San Francisco?
The most direct connections are through Sacramento (SMF), Las Vegas (LAS), Phoenix (PHX), Salt Lake City (SLC) and Boise (BOI). On 4 of them the same airline flies both flights, for example Southwest Airlines through Las Vegas.
More routes
Routes are scheduled nonstop flights. The route data is refreshed monthly; this list was last checked November 11, 2026. Seasonal routes and new launches can be missing or end early, so confirm with the airline before you book. Distances are great-circle, the shortest path between the two airports.