Route guide · 363 miles
Cheap Flights from Ontario to San Francisco
ONT → SFO · Nonstop 1h 14m · Live round-trip fares
If San Francisco is next on your list, here's the honest picture on fares from Ontario. The trip covers about 363 miles and takes roughly 1h 14m in the air. Prices on this route reward planners: booking 2–4 weeks ahead is the sweet spot, and the lowest fares tend to sell out fast.
Live fares for ONT → SFO are updating. Use the search below for real-time prices.
Search live pricesCheapest recent fare
See live fares
Updated daily
Flight time
1h 14m
Nonstop, typical
Distance
363 mi
ONT → SFO
Book ahead
2–4 weeks
Best window, typically
Nonstop airlines
1
United Airlines
Nonstop flights from Ontario to San Francisco
The fastest way between the two cities is the nonstop: about 1h 14m for the 363-mile run from ONT to SFO. Those flights are flown by United Airlines. Prices behave best when you book 2–4 weeks out.
Booking insights: Ontario → San Francisco
- Distance: 363 miles · nonstop flight time: 1h 14m.
- Fares tend to bottom out when you book about 2–4 weeks ahead — earlier than that rarely helps, later usually hurts.
- If your dates flex by a day or two, shifting to a midweek departure is the easiest saving there is.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
Free fare alerts
Watch Ontario (ONT) → San Francisco (SFO)
We check this route's fares daily. The moment the price drops, we'll email you — free, unsubscribe anytime.
Talk to a real person
Get Ontario → San Francisco flights confirmed by phone
Fares move fast. Call us and we'll confirm the latest price for your dates — or drop your number and we'll call you back. Free, no payment taken on the call.
Request a callback
Flying from Ontario to San Francisco: what you need to know
The flight
At 363 miles, ONT to SFO is one of those quick up-and-down flights: roughly 1h 14m nonstop. There's no meal service to plan around — the decisions that matter here are departure time and which airport entrance traffic is kinder to you.
Airlines on this route
United Airlines flies this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from Ontario (ONT)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our Ontario airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in San Francisco (SFO)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The San Francisco airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check San Francisco to Ontario fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 363 miles, booking 2–4 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Flexible dates? Search a few days either side — one day can change the fare a lot.
- Morning flights are delayed less often than evening ones — earlier departures have the best on-time record.
- Basic economy fares often exclude checked bags and seat selection. Price the whole trip, not the headline fare.
- Get to the airport two hours before departure; security, not the flight, is the part that runs late.
- If you're traveling with only a carry-on, you can skip the bag-drop line entirely with mobile check-in.
Ontario to San Francisco flight FAQs
How long is the flight from ONT to SFO?
Nonstop flights from Ontario to San Francisco take about 1h 14m and cover roughly 363 miles. One-stop itineraries add 2–4 hours depending on the layover city.
Are there nonstop flights from Ontario to San Francisco?
United Airlines typically operate nonstop flights from ONT to SFO. Nonstops are usually cheapest when booked 2–4 weeks ahead of departure.
What is the cheapest month to fly from Ontario to San Francisco?
Travelers usually find the gentlest prices away from peak periods — think post-holiday January and the early-fall weeks. Midweek dates inside those windows are cheaper still.
How much are last minute flights from ONT to SFO?
Walking up to this route at the last minute is the expensive way to do it — prices inside 7 days of departure climb fast. The 2–4 weeks booking window is where the value sits.
What is a good round-trip deal from Ontario to San Francisco?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from Ontario to San Francisco?
You'll mainly see United Airlines on Ontario to San Francisco. Checking each against the live fares below is the surest way to find the lowest price for your dates.
How early should I get to Ontario airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
More cheap flights from Ontario
How Airfare Deal works — Airfare Deal is a free fare-search and enquiry service. We take no payment online; send an enquiry and our travel team confirms your fare before you pay anything.