Flight number record
OO 3750
SkyWest Airlines · Seattle to Boise
- Route
- SEA → BOI
- Departs
- 07:15
- Flights
- 252
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3750, 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 3750 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 252 flights, with a median arrival 13 minutes early.
Set against the rest of the country, OO 3750's record is 16 points better than the US average of 77.3%. That gap is worth roughly 156 fewer late arrivals for every thousand flights.
Key figures
On time
92.9%
Arrivals under 15 minutes late, of 252 completed flights
Avg delay
83 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
3.2%
National rate is 8.3%
These figures cover 252 flights between September 2025 and August 2026. The median arrival is 13 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When OO 3750 flies
OO 3750 flies SEA to BOI without a single fixed slot. Its most common scheduled departure was 07:15, used on 179 of 252 flights, with 07:20 (57 flights) next.
- Departs 07:15179 flights71.0%
- Departs 07:2057 flights22.6%
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 07:15 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 3750 runs 4 points better at 92.9%. 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 3750 next to SEA to BOI
Every carrier on SEA to BOI combined arrived on time 86.3% of the time across 3,829 flights, so OO 3750 is 7 points ahead of it. SkyWest flew 2,853 flights on the same city pair under all its flight numbers, including this one, and those ran 87.8% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3750thin sample | 252 | 92.9% | 83 min | 0.00% | A+ |
| All SkyWest Airlines on SEA–BOI | 2,853 | 87.8% | 55 min | 0.21% | A+ |
| All carriers on SEA–BOI | 3,829 | 86.3% | 51 min | 0.26% | A+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3750 quarter by quarter
Quarter by quarter OO 3750 held fairly steady: 88.5% in Jan–Mar 2026, 95.6% in Apr–Jun 2026 and 95.2% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Oct–Dec 202512 flights—
- Jan–Mar 202687 flights88.5%
- Apr–Jun 202691 flights95.6%
- Jul–Sep 202662 flights95.2%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 3750 did best on Sunday at 100.0% on time and worst on Thursday at 83.3%. Each day rests on about 36 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3750 runs when it is late
OO 3750 often beats the schedule: 119 of 252 completed flights, 47%, arrived 15 minutes or more early. The 18 late arrivals split 6 under half an hour, 4 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early119 flights47.2%
- Within 15 min115 flights45.6%
- 15–29 min late6 flights2.4%
- 30–59 min late4 flights1.6%
- 1–2 hours late4 flights1.6%
- 2+ hours late4 flights1.6%
Scale runs 0% to 100%.
Share of 252 completed flights by arrival against schedule.
Only 15 of 252 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for OO 3750
The latest arrival of the period was on 31 December 2025, 5 hours 46 minutes behind schedule; most of its delay minutes were filed as extreme weather. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 31 December 2025 | 5 hours 46 minutes | Extreme weather |
| 15 January 2026 | 3 hours 32 minutes | Extreme weather |
| 15 April 2026 | 2 hours 54 minutes | Carrier |
| 7 August 2026 | 2 hours 40 minutes | Carrier |
| 1 January 2026 | 1 hour 21 minutes | Extreme weather |
Delay causes
Why OO 3750 runs late
Carrier accounts for 47% of the 1,487 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Carrier
- 46%Extreme weather
- 7%National Airspace System
Extreme weather accounts for 46% 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 7.6 times the usual weather exposure. The split is drawn from 1,487 delay minutes reported on OO 3750.
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
Badly late arrivals are rare here: only 3.2% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The same number turns up on six other city pairs in the data, including BOI to SEA (239), FAR to MSP (4) and MSP to FAR (4), but none flew often enough under OO 3750 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to BOI only.
One caution: this is a thin sample. 252 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 3750
For a booking, OO 3750 has one of the better records a US domestic flight can show: 92.9% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SEA to BOI, every carrier and departure
- BOI to SEA, the return direction
- SkyWest Airlines 4127 on the same route87.4%
- SkyWest Airlines 3688 on the same route85.8%
- SkyWest Airlines 3692 on the same route86.1%
- Seattle-Tacoma International (SEA) 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
- Worst months to fly in the US, ranked by the data
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.