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585 km · Domestic

Ontario (ONT) – San Francisco (SFO)

In July 2026, 245 flights operated between Ontario and San Francisco (both directions), and 64.1% left on time, according to the US BTS.

Official · July 2026 according to the US BTS only airlines required to report on-time data to the US DOT

Flights per month

Only complete months are shown. A month appears once the source has published every day of it.

The most recent periods19 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January201182▼ 9.5%
February203158▼ 22.2%
March229204▼ 10.9%
April306248▼ 19.0%
May262250▼ 4.6%
June207239▲ 15.5%
July208245▲ 17.8%
August216––
September216––
October228–in progress
November206––
December204––
Year to date (Jan–Jul)1,6161,526▼ 5.6%

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods19 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January91.0%83.0%▼ 8.8%
February85.2%79.1%▼ 7.2%
March78.2%91.2%▲ 16.6%
April91.2%79.0%▼ 13.4%
May83.6%67.6%▼ 19.1%
June78.3%56.9%▼ 27.3%
July71.6%64.1%▼ 10.5%
August79.2%––
September83.8%––
October78.1%–in progress
November75.2%––
December77.0%––
Year-to-date average (Jan–Jul)82.7%74.4%▼ 10.1%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January14▲ 300.0%
February70▼ 100.0%
March63▼ 50.0%
April10▼ 100.0%
May04–
June110.0%
July01–
August2––
September0––
October0–in progress
November4––
December4––
Year to date (Jan–Jul)1613▼ 18.8%

Airlines on this route

  1. United Airlines 56.7%
  2. SkyWest Airlines 28.2%
  3. Frontier Airlines 15.1%

Oct 1, 2024 – Jul 31, 2026

By direction

ONT → SFO

Scheduled flights
2,556
Flights operated
2,528
Cancelled
28 · 1.1%
On-time departures
77.1%

SFO → ONT

Scheduled flights
2,557
Flights operated
2,532
Cancelled
25 · 1.0%
On-time departures
80.6%

ONT → SFO and SFO → ONT counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
United Airlines UA 2,901 56.7% 83.4% 8
SkyWest Airlines OO 1,442 28.2% 79.6% 30
Frontier Airlines F9 770 15.1% 59.6% 15

Shares are of scheduled flights in the period shown. Codeshare flights are counted once, under the operating airline.

Flight timing & delays

Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.

Times are local to the departure airport of each flight; both directions are combined.

US domestic sectors recorded by BTS

Source: the US BTS · Oct 12, 2024 → Jul 31, 2026

Lowest average delay06:00–07:003.1min · 623 recorded · 620 measured
Gap to highest-delay hour15.9min06:00 ↔ 18:00
Recorded flights5,113ONT–SFO

Departure hour

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · Fewer than 200 measured departures · 11 recorded · 11 measured · Source: the US BTS 06:00 · 93.6% · 623 recorded · 620 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 64 recorded · 64 measured · Source: the US BTS 08:00 · 80.8% · 405 recorded · 401 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 156 recorded · 154 measured · Source: the US BTS 10:00 · 84.5% · 555 recorded · 553 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 172 recorded · 172 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 24 recorded · 24 measured · Source: the US BTS 13:00 · 79.2% · 656 recorded · 650 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 19 recorded · 19 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 132 recorded · 129 measured · Source: the US BTS 16:00 · 80.1% · 666 recorded · 657 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 34 recorded · 32 measured · Source: the US BTS 18:00 · 69.3% · 637 recorded · 628 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 130 recorded · 128 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 52 recorded · 52 measured · Source: the US BTS 21:00 · 78.0% · 583 recorded · 578 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 194 recorded · 188 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · Fewer than 200 measured departures · 11 recorded · 11 measured · Source: the US BTS 06:00 · 3.1 min · 623 recorded · 620 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 64 recorded · 64 measured · Source: the US BTS 08:00 · 6.3 min · 405 recorded · 401 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 156 recorded · 154 measured · Source: the US BTS 10:00 · 6.5 min · 555 recorded · 553 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 172 recorded · 172 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 24 recorded · 24 measured · Source: the US BTS 13:00 · 13.1 min · 656 recorded · 650 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 19 recorded · 19 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 132 recorded · 129 measured · Source: the US BTS 16:00 · 12.3 min · 666 recorded · 657 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 34 recorded · 32 measured · Source: the US BTS 18:00 · 18.9 min · 637 recorded · 628 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 130 recorded · 128 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 52 recorded · 52 measured · Source: the US BTS 21:00 · 14.7 min · 583 recorded · 578 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 194 recorded · 188 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · 11 · 11 recorded · 11 measured · Source: the US BTS 06:00 · 623 · 623 recorded · 620 measured · Source: the US BTS 07:00 · 64 · 64 recorded · 64 measured · Source: the US BTS 08:00 · 405 · 405 recorded · 401 measured · Source: the US BTS 09:00 · 156 · 156 recorded · 154 measured · Source: the US BTS 10:00 · 555 · 555 recorded · 553 measured · Source: the US BTS 11:00 · 172 · 172 recorded · 172 measured · Source: the US BTS 12:00 · 24 · 24 recorded · 24 measured · Source: the US BTS 13:00 · 656 · 656 recorded · 650 measured · Source: the US BTS 14:00 · 19 · 19 recorded · 19 measured · Source: the US BTS 15:00 · 132 · 132 recorded · 129 measured · Source: the US BTS 16:00 · 666 · 666 recorded · 657 measured · Source: the US BTS 17:00 · 34 · 34 recorded · 32 measured · Source: the US BTS 18:00 · 637 · 637 recorded · 628 measured · Source: the US BTS 19:00 · 130 · 130 recorded · 128 measured · Source: the US BTS 20:00 · 52 · 52 recorded · 52 measured · Source: the US BTS 21:00 · 583 · 583 recorded · 578 measured · Source: the US BTS 22:00 · 194 · 194 recorded · 188 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00No observations———
01:00No observations———
02:00No observations———
03:00No observations———
04:00No observations———
05:00Fewer than 200 measured departures—1111
06:0093.6%3.1 min620623
07:00Fewer than 200 measured departures—6464
08:0080.8%6.3 min401405
09:00Fewer than 200 measured departures—154156
10:0084.5%6.5 min553555
11:00Fewer than 200 measured departures—172172
12:00Fewer than 200 measured departures—2424
13:0079.2%13.1 min650656
14:00Fewer than 200 measured departures—1919
15:00Fewer than 200 measured departures—129132
16:0080.1%12.3 min657666
17:00Fewer than 200 measured departures—3234
18:0069.3%18.9 min628637
19:00Fewer than 200 measured departures—128130
20:00Fewer than 200 measured departures—5252
21:0078.0%14.7 min578583
22:00Fewer than 200 measured departures—188194
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 74.2% · 824 recorded · 818 measured · Source: the US BTS Tuesday · 85.6% · 618 recorded · 617 measured · Source: the US BTS Wednesday · 79.9% · 630 recorded · 626 measured · Source: the US BTS Thursday · 76.9% · 763 recorded · 743 measured · Source: the US BTS Friday · 77.2% · 812 recorded · 803 measured · Source: the US BTS Saturday · 82.9% · 640 recorded · 638 measured · Source: the US BTS Sunday · 77.7% · 826 recorded · 815 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Monday · 19.2 min · 824 recorded · 818 measured · Source: the US BTS Tuesday · 3.0 min · 618 recorded · 617 measured · Source: the US BTS Wednesday · 8.9 min · 630 recorded · 626 measured · Source: the US BTS Thursday · 13.8 min · 763 recorded · 743 measured · Source: the US BTS Friday · 13.7 min · 812 recorded · 803 measured · Source: the US BTS Saturday · 12.7 min · 640 recorded · 638 measured · Source: the US BTS Sunday · 14.8 min · 826 recorded · 815 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 824 · 824 recorded · 818 measured · Source: the US BTS Tuesday · 618 · 618 recorded · 617 measured · Source: the US BTS Wednesday · 630 · 630 recorded · 626 measured · Source: the US BTS Thursday · 763 · 763 recorded · 743 measured · Source: the US BTS Friday · 812 · 812 recorded · 803 measured · Source: the US BTS Saturday · 640 · 640 recorded · 638 measured · Source: the US BTS Sunday · 826 · 826 recorded · 815 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday74.2%19.2 min818824
Tuesday85.6%3.0 min617618
Wednesday79.9%8.9 min626630
Thursday76.9%13.8 min743763
Friday77.2%13.7 min803812
Saturday82.9%12.7 min638640
Sunday77.7%14.8 min815826

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Jan · 87.2% · 388 recorded · 383 measured · Source: the US BTS Feb · 82.6% · 368 recorded · 361 measured · Source: the US BTS Mar · 84.3% · 442 recorded · 433 measured · Source: the US BTS Apr · 85.7% · 555 recorded · 554 measured · Source: the US BTS May · 75.8% · 516 recorded · 512 measured · Source: the US BTS Jun · 66.8% · 448 recorded · 446 measured · Source: the US BTS Jul · 67.6% · 454 recorded · 453 measured · Source: the US BTS Aug · 79.2% · 218 recorded · 216 measured · Source: the US BTS Sep · 83.8% · 216 recorded · 216 measured · Source: the US BTS Oct · 82.4% · 450 recorded · 450 measured · Source: the US BTS Nov · 76.4% · 570 recorded · 556 measured · Source: the US BTS Dec · 78.3% · 488 recorded · 480 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Jan · 17.8 min · 388 recorded · 383 measured · Source: the US BTS Feb · 8.9 min · 368 recorded · 361 measured · Source: the US BTS Mar · 6.2 min · 442 recorded · 433 measured · Source: the US BTS Apr · 5.3 min · 555 recorded · 554 measured · Source: the US BTS May · 12.0 min · 516 recorded · 512 measured · Source: the US BTS Jun · 18.9 min · 448 recorded · 446 measured · Source: the US BTS Jul · 18.5 min · 454 recorded · 453 measured · Source: the US BTS Aug · 22.6 min · 218 recorded · 216 measured · Source: the US BTS Sep · 9.0 min · 216 recorded · 216 measured · Source: the US BTS Oct · 6.9 min · 450 recorded · 450 measured · Source: the US BTS Nov · 16.9 min · 570 recorded · 556 measured · Source: the US BTS Dec · 13.8 min · 488 recorded · 480 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 388 · 388 recorded · 383 measured · Source: the US BTS Feb · 368 · 368 recorded · 361 measured · Source: the US BTS Mar · 442 · 442 recorded · 433 measured · Source: the US BTS Apr · 555 · 555 recorded · 554 measured · Source: the US BTS May · 516 · 516 recorded · 512 measured · Source: the US BTS Jun · 448 · 448 recorded · 446 measured · Source: the US BTS Jul · 454 · 454 recorded · 453 measured · Source: the US BTS Aug · 218 · 218 recorded · 216 measured · Source: the US BTS Sep · 216 · 216 recorded · 216 measured · Source: the US BTS Oct · 450 · 450 recorded · 450 measured · Source: the US BTS Nov · 570 · 570 recorded · 556 measured · Source: the US BTS Dec · 488 · 488 recorded · 480 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan87.2%17.8 min383388
Feb82.6%8.9 min361368
Mar84.3%6.2 min433442
Apr85.7%5.3 min554555
May75.8%12.0 min512516
Jun66.8%18.9 min446448
Jul67.6%18.5 min453454
Aug79.2%22.6 min216218
Sep83.8%9.0 min216216
Oct82.4%6.9 min450450
Nov76.4%16.9 min556570
Dec78.3%13.8 min480488

Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.

Recorded outcomes

  • On time 78.0% 3,988
  • Delayed >15 min 21.0% 1,072
  • Cancelled 1.0% 53
  • Missing departure time 0.0% 0

All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.

On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.

Flight numbers on this route

50
50 of 50
Flight numbersBy direction DeparturesOn time
F992678 SFO → ONT 350 60.6%
F992677 ONT → SFO 309 59.3%
UA277 ONT → SFO 307 93.8%
UA2363 ONT → SFO 201 92.5%
UA552 SFO → ONT 194 82.4%
OO5740 SFO → ONT 178 87.0%
UA1697 SFO → ONT 178 89.3%
OO4783 SFO → ONT 175 85.8%
UA2661 SFO → ONT 164 89.0%
OO5429 ONT → SFO 163 82.2%
UA2332 ONT → SFO 147 87.1%
OO4639 ONT → SFO 145 75.7%
OO5684 SFO → ONT 137 81.2%
UA448 SFO → ONT 133 75.2%
UA1375 ONT → SFO 129 65.1%
UA794 SFO → ONT 91 92.3%
OO5613 SFO → ONT 78 61.3%
UA1561 SFO → ONT 76 86.8%
F991159 ONT → SFO 74 50.7%
UA1665 ONT → SFO 71 67.6%
UA1772 SFO → ONT 68 92.7%
UA393 ONT → SFO 68 70.6%
OO5624 ONT → SFO 62 34.4%
UA1470 ONT → SFO 58 79.3%
OO5920 ONT → SFO 52 78.0%
UA1074 SFO → ONT 51 86.3%
OO4662 ONT → SFO 49 89.8%
UA765 SFO → ONT 49 93.9%
UA1708 ONT → SFO 48 85.4%
UA698 ONT → SFO 47 59.6%
UA368 SFO → ONT 46 67.4%
OO5921 SFO → ONT 37 70.3%
UA1739 ONT → SFO 37 86.1%
UA2012 ONT → SFO 37 94.6%
UA210 SFO → ONT 37 97.3%
UA2647 ONT → SFO 37 97.3%
OO5645 ONT → SFO 36 76.5%
UA2072 ONT → SFO 36 70.6%
UA796 SFO → ONT 36 69.4%
F991160 SFO → ONT 35 68.6%
OO5921 ONT → SFO 35 68.6%
UA1152 SFO → ONT 35 80.0%
UA552 ONT → SFO 35 57.1%
UA216 SFO → ONT 34 87.5%
UA2692 SFO → ONT 34 58.8%
OO5257 ONT → SFO 32 93.8%
OO5361 ONT → SFO 32 100.0%
UA1585 ONT → SFO 31 74.2%
UA1840 ONT → SFO 31 90.3%
UA1603 ONT → SFO 30 60.0%

Flight numbers are the codes sold on tickets. On shared flights one aircraft can carry several of them. Only numbers with at least 30 flights have a page.

Monthly figures
PeriodFlights operated Change vs last yearCancelled On-time departures
July 2026 245 +17.8% 1 64.1%
June 2026 239 +15.5% 1 56.9%
May 2026 250 −4.6% 4 67.6%
April 2026 248 −19.0% 0 79.0%
March 2026 204 −10.9% 3 91.2%
February 2026 158 −22.2% 0 79.1%
January 2026 182 −9.5% 4 83.0%
December 2025 204 −26.1% 4 77.0%
November 2025 206 −41.1% 4 75.2%
October 2025 228 +2.7% 0 78.1%
September 2025 216 0 83.8%
August 2025 216 2 79.2%
July 2025 208 0 71.6%
June 2025 207 1 78.3%
May 2025 262 0 83.6%
April 2025 306 1 91.2%
March 2025 229 6 78.2%
February 2025 203 7 85.2%
January 2025 201 1 91.0%
December 2024 276 4 79.3%
November 2024 350 10 77.1%
October 2024 222 0 86.9%

How to read this chart

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