Flight number record
OO 3775
SkyWest Airlines · Boise to Seattle
- Route
- BOI → SEA
- Departs
- 05:40
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3775, 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 3775 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 18 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 361 flights, with a median arrival 14 minutes early.
Set against the rest of the country, OO 3775's record is 18 points better than the US average of 77.3%. That gap is worth roughly 177 fewer late arrivals for every thousand flights.
Key figures
On time
95.0%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
1.1%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 2026. The median arrival is 14 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 3775 flies
OO 3775 flies BOI to SEA without a single fixed slot. Its most common scheduled departure was 05:40, used on 74 of 361 flights, with 05:45 (63 flights) and 05:20 (41 flights) next.
- Departs 05:4074 flights20.5%
- Departs 05:4563 flights17.5%
- Departs 05:2041 flights11.4%
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 05:40 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 3775 runs 6 points better at 95.0%. 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 3775 next to BOI to SEA
Every carrier on BOI to SEA combined arrived on time 84.9% of the time across 3,730 flights, so OO 3775 is 10 points ahead of it. SkyWest flew 2,754 flights on the same city pair under all its flight numbers, including this one, and those ran 85.9% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3775thin sample | 361 | 95.0% | 71 min | 0.00% | A+ |
| All SkyWest Airlines on BOI–SEA | 2,754 | 85.9% | 61 min | 0.29% | A+ |
| All carriers on BOI–SEA | 3,730 | 84.9% | 56 min | 0.40% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3775 quarter by quarter
Quarter by quarter OO 3775 held fairly steady: 100.0% in Jul–Sep 2025, 93.3% in Oct–Dec 2025, 92.0% in Jan–Mar 2026, 96.7% in Apr–Jun 2026 and 96.8% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights100.0%
- Oct–Dec 202590 flights93.3%
- Jan–Mar 202688 flights92.0%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202662 flights96.8%
Scale runs 85% to 100%.
By weekday, OO 3775 ranged from 90.4% on Sunday to 98.0% on Friday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 3775 runs when it is late
OO 3775 often beats the schedule: 177 of 360 completed flights, 49%, arrived 15 minutes or more early. Most of the lateness is short. 11 of the 18 late arrivals were under half an hour behind, and 4 reached an hour or more.
- 15+ min early177 flights49.2%
- Within 15 min165 flights45.8%
- 15–29 min late11 flights3.1%
- 30–59 min late3 flights0.8%
- 1–2 hours late3 flights0.8%
- 2+ hours late1 flights0.3%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
Only 12 of 360 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 3775
The latest arrival of the period was on 21 November 2025, 12 hours 6 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 November 2025 | 12 hours 6 minutes | Extreme weather |
| 1 December 2025 | 1 hour 21 minutes | Carrier |
| 18 August 2026 | 1 hour 15 minutes | Carrier |
| 6 June 2026 | 1 hour 2 minutes | Carrier |
| 28 December 2025 | 53 minutes | Extreme weather |
Delay causes
Why OO 3775 runs late
Extreme weather accounts for 66% of the 1,277 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Extreme weather
- 30%Carrier
- 4%National Airspace System
Extreme weather accounts for 66% 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 10.9 times the usual weather exposure. The split is drawn from 1,277 delay minutes reported on OO 3775.
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 1.1% 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.
Every one of the 361 flights under OO 3775 in the data flew BOI to SEA. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 361 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 3775
For a booking, OO 3775 has one of the better records a US domestic flight can show: 95.0% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- BOI to SEA, every carrier and departure
- SEA to BOI, the return direction
- SkyWest Airlines 3740 on the same route82.1%
- SkyWest Airlines 3678 on the same route90.4%
- SkyWest Airlines 4127 on the same route82.8%
- 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.