Flight number record

OO 5670

SkyWest Airlines · San Francisco to Monterey

Route: SFO → MRY
Departs: 21:05
Flights: 281
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5670, check with SkyWest Airlines. SkyWest Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.

OO 5670 sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land about 2.2 hours behind schedule. That rests on 281 flights, with a median arrival 8 minutes early.

On time

75.5%

Arrivals under 15 minutes late, of 278 completed flights

Avg delay

135 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.89%

1 hour+ late

12.2%

National rate is 8.3%

These figures cover 281 flights between September 2025 and August 2026. Beyond the headline rate, 12.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.

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Schedule

When OO 5670 flies

OO 5670 flies SFO to MRY without a single fixed slot. Its most common scheduled departure was 21:05, used on 86 of 281 flights, with 22:40 (68 flights) and 20:45 (38 flights) next.

Departs 21:0586 flights30.6%
Departs 22:4068 flights24.2%
Departs 20:4538 flights13.5%

Scale runs 0% to 100%.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 21:05 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 5670 runs 5 points better at 75.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

OO 5670 next to SFO to MRY

Every carrier on SFO to MRY combined arrived on time 72.6% of the time across 780 flights, so OO 5670 is 3 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 3 points.

OO 5670 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5670thin sample	281	75.5%	135 min	0.00%	B+
All SkyWest Airlines on SFO–MRY	780	72.6%	89 min	0.38%	C+
All carriers on SFO–MRY	780	72.6%	89 min	0.38%	C+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 5670 quarter by quarter

OO 5670 did not run the same all year. Its best quarter was Jan–Mar 2026 at 92.2% on time and its weakest Jul–Sep 2026 at 64.3%, a swing of 28 points on roughly 70 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202523 flights—
Oct–Dec 202574 flights80.8%
Jan–Mar 202653 flights92.2%
Apr–Jun 202675 flights72.0%
Jul–Sep 202656 flights64.3%

Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5670 did best on Saturday at 88.9% on time and worst on Sunday at 56.5%. Each day rests on about 40 flights, so a gap of 32 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 5670 runs when it is late

OO 5670 often beats the schedule: 101 of 278 completed flights, 36%, arrived 15 minutes or more early. The 68 late arrivals split 21 under half an hour, 13 between 30 and 60 minutes, and 34 an hour or more.

15+ min early101 flights36.3%
Within 15 min109 flights39.2%
15–29 min late21 flights7.6%
30–59 min late13 flights4.7%
1–2 hours late15 flights5.4%
2+ hours late19 flights6.8%

Scale runs 0% to 100%.

Share of 278 completed flights by arrival against schedule.

17 of 82 late departures made up the time and arrived on time, 21% of them. Only 3 left on time and still arrived late.

The worst days

Worst days for OO 5670

The latest arrival of the period was on 2 August 2026, 15 hours 17 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on four of the five worst days.

The latest arrivals of OO 5670 in the period
Date	Arrived late by	Largest filed cause
2 August 2026	15 hours 17 minutes	National Airspace System
29 May 2026	13 hours 24 minutes	Carrier
11 September 2025	10 hours 18 minutes	National Airspace System
23 April 2026	10 hours 15 minutes	National Airspace System
17 September 2025	9 hours 26 minutes	National Airspace System

Delay causes

Why OO 5670 runs late

National Airspace System accounts for 51% of the 9,156 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
51%
Carrier
20%
Late-arriving aircraft
17%
Extreme weather
12%

Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.0 times the usual weather exposure. The split is drawn from 9,156 delay minutes reported on OO 5670.

Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

12.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.

The same number turns up on three other city pairs in the data, including ORD to CMH (20), RDM to SFO (19) and OMA to DEN (13), but none flew often enough under OO 5670 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SFO to MRY only.

One caution: this is a thin sample. 281 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.

What to do with this

Booking OO 5670

For a booking, OO 5670 is a flight to put a long connection behind. 12.2% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.

Where to go next

A flight number here means SkyWest Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures