San Francisco (SFO) to Ontario (ONT) flights
2 airlines fly nonstop from San Francisco (SFO) to Ontario (ONT): 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 SFO to ONT
- Frontier AirlinesNot in an allianceWho books it
- United AirlinesStar Alliance · bookable with 13 programsWho books it
Book SFO to ONT 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
SFO to ONT with one stop
5 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Sacramento (SMF)United Airlines, then Southwest Airlines and Frontier Airlines
- Via Las Vegas (LAS)Frontier Airlines and Southwest 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
SFO to ONT: common questions
Which airlines fly nonstop from SFO to ONT?
Frontier Airlines and United Airlines (Star Alliance) fly nonstop from San Francisco (SFO) to Ontario (ONT).
How far is San Francisco from Ontario by plane?
San Francisco (SFO) and Ontario (ONT) 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 SFO to ONT 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 SFO to ONT cost?
It depends on the program: each prices the route from its own chart or dynamically. The Award Flight Pricer compares 30+ programs for SFO to ONT with taxes and fees.
Where can I connect between San Francisco and Ontario?
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 Frontier 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.