Basic Economy allows a personal item only; no carry-on bags without extra fees.
Economy Plus offers extra legroom seats towards the front of the economy cabin.

Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $77 (CheapOair) |
One-way from | $39 (United Airlines) |
Popular in | November |
Cheapest in | May |
Average price | $137 |
Good round-trip deal | $124 or less |
Good one-way deal | $80 or less |
Fly from
Fly to
Route
Depart
Return
Price
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 11/15
6:38 pm-8:02 pm
Nonstop1h 24m
San Francisco
Mon 11/17
11:15 am-12:37 pm
Nonstop1h 22m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 11/13
1:40 pm-3:04 pm
Nonstop1h 24m
San Francisco
Tue 11/18
11:15 am-12:37 pm
Nonstop1h 22m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Tue 11/11
6:38 pm-8:02 pm
Nonstop1h 24m
San Francisco
Wed 11/12
9:30 pm-10:51 pm
Nonstop1h 21m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 11/5
6:00 am-7:24 am
Nonstop1h 24m
San Francisco
Wed 11/12
9:30 pm-10:51 pm
Nonstop1h 21m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Mon 11/10
6:00 am-7:24 am
Nonstop1h 24m
San Francisco
Sat 11/15
9:30 pm-10:51 pm
Nonstop1h 21m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 11/6
6:00 am-7:24 am
Nonstop1h 24m
San Francisco
Tue 11/11
11:15 am-12:37 pm
Nonstop1h 22m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 11/13
1:40 pm-3:04 pm
Nonstop1h 24m
San Francisco
Wed 11/19
11:15 am-12:37 pm
Nonstop1h 22m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 10/30
11:05 am-4:15 pm
1 stop5h 10m
San Francisco
Sun 11/2
5:15 am-10:25 am
1 stop5h 10m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Tue 10/28
1:40 pm-3:04 pm
Nonstop1h 24m
San Francisco
Wed 10/29
9:30 pm-10:51 pm
Nonstop1h 21m
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 12/6
8:35 am-1:40 pm
2 stops5h 05m
San Francisco
Sun 12/7
5:15 am-9:55 am
1 stop4h 40m
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*3 stars | |
| Price Accuracy- | Trust Score*1 star |
Booking 74 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to San Francisco. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Currently, December is the cheapest month in which you can book a flight from Ontario to San Francisco (average of $17). Flying from Ontario to San Francisco in July is currently the most expensive (average of $51). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
One of the essential ways to save on airfare from Ontario to San Francisco is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 59% on airfare.
Travelers seeking maximum savings on their Ontario to San Francisco flight should consider departing on Thursday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Entertainment
Food
Comfort
Overall
Crew
Boarding
Reviews
Hannah,Aug 2025
SFO - SAN
Entertainment
Food
Comfort
Overall
Crew
Boarding
Reviews
Hannah,Aug 2025
SFO - SAN
Entertainment
Food
Comfort
Overall
Crew
Boarding
Reviews
Hannah,Aug 2025
SFO - SAN
Entertainment
Food
Comfort
Overall
Crew
Boarding
Reviews
Hannah,Aug 2025
SFO - SAN
Entertainment
Food
Comfort
Overall
Crew
Boarding
Reviews
Hannah,Aug 2025
SFO - SAN
Entertainment
Food
Comfort
Overall
Crew
Boarding
Reviews
Hannah,Aug 2025
SFO - SAN
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$36 | Average$99 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$37 | Average$86 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$58 | Average$182 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$67 | Average$200 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$116 | Average$345 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$147 | Average$197 | FlexibilityNo cancel fee | On-timeN/A |