Flight number record
OO 4683
SkyWest Airlines · Tucson to San Francisco
- Route
- TUS → SFO
- Departs
- 07:02
- Flights
- 333
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4683, 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 4683 earns a D+, which is as low as this site's scale goes for a reason. Only 57.8% of flights arrive inside the 15-minute window, 20 points worse than the national rate of 77.3%. Late arrivals average about 50 minutes. Treat any tight connection here as a coin flip. That rests on 333 flights, with a median arrival 9 minutes late.
The national on-time rate over the same period is 77.3%, so OO 4683 runs 20 points behind the country as a whole. Across a thousand flights that is about 195 extra late arrivals.
Key figures
On time
57.8%
Arrivals under 15 minutes late, of 332 completed flights
Avg delay
51 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
11.1%
National rate is 8.3%
These figures cover 333 flights between September 2025 and August 2026. Beyond the headline rate, 11.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4683 flies
OO 4683 flies TUS to SFO without a single fixed slot. Its most common scheduled departure was 07:02, used on 95 of 333 flights, with 09:04 (81 flights) and 08:50 (52 flights) next.
- Departs 07:0295 flights28.5%
- Departs 09:0481 flights24.3%
- Departs 08:5052 flights15.6%
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 07:02 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 4683 runs 32 points worse at 57.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 4683 next to TUS to SFO
Every carrier on TUS to SFO combined arrived on time 66.4% of the time across 945 flights, so OO 4683 is 9 points behind it. SkyWest flew 883 flights on the same city pair under all its flight numbers, including this one, and those ran 66.2% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 21 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4683thin sample | 333 | 57.8% | 51 min | 0.00% | D+ |
| All SkyWest Airlines on TUS–SFO | 883 | 66.2% | 66 min | 0.34% | C+ |
| All carriers on TUS–SFO | 945 | 66.4% | 66 min | 0.42% | C+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4683 quarter by quarter
OO 4683 did not run the same all year. Its best quarter was Oct–Dec 2025 at 89.4% on time and its weakest Apr–Jun 2026 at 19.8%, a swing of 70 points on roughly 83 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 202524 flights—
- Oct–Dec 202566 flights89.4%
- Jan–Mar 202690 flights82.0%
- Apr–Jun 202691 flights19.8%
- Jul–Sep 202662 flights32.3%
Scale runs 10% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4683 did best on Sunday at 70.2% on time and worst on Friday at 48.9%. Each day rests on about 48 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4683 runs when it is late
The 140 late arrivals split 60 under half an hour, 43 between 30 and 60 minutes, and 37 an hour or more.
- 15+ min early58 flights17.5%
- Within 15 min134 flights40.4%
- 15–29 min late60 flights18.1%
- 30–59 min late43 flights13.0%
- 1–2 hours late25 flights7.5%
- 2+ hours late12 flights3.6%
Scale runs 0% to 100%.
Share of 332 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 123 departures that left 15 minutes late or more, only 7 made it up before arrival. In the other direction, 24 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SFO.
The worst days
Worst days for OO 4683
The latest arrival of the period was on 20 April 2026, 3 hours 52 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 April 2026 | 3 hours 52 minutes | National Airspace System |
| 17 March 2026 | 3 hours 48 minutes | Carrier |
| 21 December 2025 | 3 hours 41 minutes | Carrier |
| 28 May 2026 | 3 hours 32 minutes | National Airspace System |
| 20 May 2026 | 2 hours 41 minutes | National Airspace System |
Delay causes
Why OO 4683 runs late
National Airspace System accounts for 83% of the 7,096 delay minutes carriers reported here, and the remaining four split what is left.
- 83%National Airspace System
- 17%Carrier
- 0%Extreme weather
83% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 5,887 minutes out of 7,096, against a national NAS share of 21%. The split is drawn from 7,096 delay minutes reported on OO 4683.
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
11.1% 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 751 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on two other city pairs in the data, including SFO to SMF (31) and LIT to IAH (1), but none flew often enough under OO 4683 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to TUS to SFO only.
One caution: this is a thin sample. 333 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 4683
For a booking, OO 4683 is one of the weaker ways to fly TUS to SFO: 9 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- TUS to SFO, every carrier and departure
- SFO to TUS, the return direction
- SkyWest Airlines 5583 on the same route72.9%
- San Francisco International (SFO) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- The best time of day to fly, according to 7.05 million flight records
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 ; recomputed monthly. How this data is collected.