Flight number record
OO 4733
SkyWest Airlines · Boise to San Francisco
- Route
- BOI → SFO
- Departs
- 12:30
- Flights
- 346
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s OO 4733, 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 4733 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 346 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.6%, so OO 4733 runs 9 points behind the country as a whole. Across a thousand flights that is about 91 extra late arrivals.
Key figures
On time
68.5%
Arrivals under 15 minutes late, of 346 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
1 hour+ late
8.4%
National rate is 8.1%
These figures cover 346 flights between July 2025 and June 2026. Beyond the headline rate, 8.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When OO 4733 flies
OO 4733 flies BOI to SFO without a single fixed slot. Its most common scheduled departure was 12:30, used on 53 of 346 flights, with 10:35 (52 flights) and 10:50 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 12:3053 flights15.3%
- Departs 10:3552 flights15.0%
- Departs 10:5049 flights14.2%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 12:30 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 4733 runs 10 points worse at 68.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
OO 4733 next to BOI to SFO
Every carrier on BOI to SFO combined arrived on time 71.2% of the time across 1,684 flights, so OO 4733 is 3 points behind it. SkyWest flew 1,453 flights on the same city pair under all its flight numbers, including this one, and those ran 71.1% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4733thin sample | 346 | 68.5% | 59 min | 0.00% | C+ |
| All SkyWest Airlines on BOI–SFO | 1,453 | 71.1% | 77 min | 0.41% | C+ |
| All carriers on BOI–SFO | 1,684 | 71.2% | 82 min | 0.48% | C+ |
| SkyWest Airlines, whole network | 852,935 | 79.0% | 88 min | 1.77% | B |
Across the year
OO 4733 quarter by quarter
OO 4733 did not run the same all year. Its best quarter was Jan–Mar 2026 at 82.4% on time and its weakest Apr–Jun 2026 at 40.7%, a swing of 42 points on roughly 87 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 202592 flights77.2%
- Oct–Dec 202578 flights75.6%
- Jan–Mar 202685 flights82.4%
- Apr–Jun 202691 flights40.7%
Scale runs 30% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4733 did best on Saturday at 83.7% on time and worst on Monday at 55.1%. Each day rests on about 49 flights, so a gap of 29 points is worth noticing but could still narrow in another year.
Delay causes
Why OO 4733 runs late
One category carries most of the weight here. National Airspace System accounts for 55% of the 6,426 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 55%National Airspace System
- 34%Carrier
- 6%Late-arriving aircraft
- 5%Extreme weather
55% 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 3,512 minutes out of 6,426, against a national NAS share of 21%. The split is drawn from 6,426 delay minutes reported on OO 4733.
Cancellations are rare at 0.00%, below the national 1.81% 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
8.4% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 522 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on one other city pair in the data, including BOI to DEN (19), but none flew often enough under OO 4733 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOI to SFO only.
One caution: this is a thin sample. 346 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 4733
For a booking, read OO 4733 as 68.5% on time with 0.00% cancelled over 346 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- BOI to SFO, every carrier and departure
- SFO to BOI, the return direction
- SkyWest Airlines 4678 on the same route87.7%
- 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 7.04 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.