Route guide · 363 miles
Cheap Flights from San Francisco to Ontario
SFO → ONT · Nonstop 1h 14m · Live round-trip fares
Plenty of travelers price out San Francisco to Ontario every day — here's how to beat the average fare. Nonstops run about 1h 14m, and the calendar matters more than the airline. Aim to book 2–4 weeks ahead, stay flexible on the day of the week, and set a free alert so a price drop never slips past you.
Live fares for SFO → ONT are updating. Use the search below for real-time prices.
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See live fares
Updated daily
Flight time
1h 14m
Nonstop, typical
Distance
363 mi
SFO → ONT
Book ahead
2–4 weeks
Best window, typically
Nonstop airlines
1
United Airlines
Nonstop flights from San Francisco to Ontario
Nonstop flights from San Francisco to Ontario are flown by United Airlines. The 363-mile trip takes about 1h 14m gate to gate, and nonstops are usually cheapest when booked 2–4 weeks ahead.
Booking insights: San Francisco → Ontario
- Distance: 363 miles · nonstop flight time: 1h 14m.
- Cheapest upcoming week in the live data starts around Nov 12, with fares from $22.
- 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.
Price trend
Cheapest departure weeks ahead
Departing around Nov 12 is currently the cheapest window — about $69 less than the nearest weeks. Based on recent fares found for this route; prices change quickly.
Cheapest month · San Francisco → Ontario
November 2026
Every date's recent round-trip fare, at a glance.
Fares from
$22
Cheapest: Mon, Nov 16 — $22
Get this fare →Recent fares found for specific dates in November 2026. Blank days had no recent fare in our data — ask our team and we'll check them for you.
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Flying from San Francisco to Ontario: what you need to know
The flight
At 363 miles, SFO to ONT 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 San Francisco (SFO)
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 San Francisco airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Ontario (ONT)
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 Ontario airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Ontario to San Francisco 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
- Nonstop time on this route is about 1h 14m — a one-stop itinerary needs to be a lot cheaper to be worth the extra hours.
- Tuesday and Wednesday departures are typically the cheapest days on domestic routes.
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
- 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.
San Francisco to Ontario flight FAQs
How long is the flight from SFO to ONT?
A nonstop from SFO to ONT clocks in at around 1h 14m for the 363-mile trip. If you're connecting, budget an extra 2–4 hours depending on where you stop.
Are there nonstop flights from San Francisco to Ontario?
United Airlines typically operate nonstop flights from SFO to ONT. Nonstops are usually cheapest when booked 2–4 weeks ahead of departure.
What is the cheapest month to fly from San Francisco to Ontario?
There's no single magic month, but prices on this route generally soften in the shoulder season, when demand dips after the holidays and again in early fall. A free fare alert is the easiest way to catch those windows.
How much are last minute flights from SFO to ONT?
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 San Francisco to Ontario?
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 San Francisco to Ontario?
You'll mainly see United Airlines on San Francisco to Ontario. 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 San Francisco 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.
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