Flight number record
OO 3688
SkyWest Airlines · Seattle to Boise
- Route
- SEA → BOI
- Departs
- 16:10
- Flights
- 361
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3688, 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 3688 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 361 flights, with a median arrival 9 minutes early.
Set against the rest of the country, OO 3688's record is 9 points better than the US average of 77.3%. That gap is worth roughly 85 fewer late arrivals for every thousand flights.
Key figures
On time
85.8%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
4.5%
National rate is 8.3%
These figures cover 361 flights between September 2025 and August 2026. The median arrival is 9 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 3688 flies
OO 3688 flies SEA to BOI without a single fixed slot. Its most common scheduled departure was 16:10, used on 88 of 361 flights, with 16:20 (71 flights) and 15:59 (38 flights) next.
- Departs 16:1088 flights24.4%
- Departs 16:2071 flights19.7%
- Departs 15:5938 flights10.5%
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 16:10 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and OO 3688 runs 14 points better at 85.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
OO 3688 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 3688 is about level with 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 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3688thin sample | 361 | 85.8% | 53 min | 0.28% | 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 3688 quarter by quarter
OO 3688 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jul–Sep 2026 at 82.0%, a swing of 15 points on roughly 72 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 202530 flights96.7%
- Oct–Dec 202588 flights92.0%
- Jan–Mar 202690 flights82.0%
- Apr–Jun 202691 flights82.4%
- Jul–Sep 202662 flights82.0%
Scale runs 75% to 100%.
By weekday, OO 3688 did best on Monday at 90.6% on time and worst on Wednesday at 76.9%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3688 runs when it is late
OO 3688 often beats the schedule: 117 of 359 completed flights, 33%, arrived 15 minutes or more early. The 51 late arrivals split 20 under half an hour, 15 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early117 flights32.6%
- Within 15 min191 flights53.2%
- 15–29 min late20 flights5.6%
- 30–59 min late15 flights4.2%
- 1–2 hours late13 flights3.6%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 45 departures that left 15 minutes late or more, only 4 made it up before arrival. 10 flights left on time and still arrived late.
The worst days
Worst days for OO 3688
The latest arrival of the period was on 31 December 2025, 4 hours 34 minutes behind schedule; most of its delay minutes were filed as extreme weather. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 31 December 2025 | 4 hours 34 minutes | Extreme weather |
| 17 May 2026 | 4 hours 20 minutes | Carrier |
| 11 February 2026 | 2 hours 9 minutes | Carrier |
| 24 October 2025 | 1 hour 46 minutes | Carrier |
| 8 July 2026 | 1 hour 45 minutes | Carrier |
Delay causes
Why OO 3688 runs late
Carrier accounts for 62% of the 2,690 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Carrier
- 31%Extreme weather
- 7%National Airspace System
Extreme weather accounts for 31% 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 5.1 times the usual weather exposure. The split is drawn from 2,690 delay minutes reported on OO 3688.
Cancellations are rare at 0.28%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is 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 4.5% 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 one other city pair in the data, including BOI to SEA (227), but none flew often enough under OO 3688 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. 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 3688
For a booking, OO 3688 has one of the better records a US domestic flight can show: 85.8% on time and 0.28% 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 3692 on the same route86.1%
- SkyWest Airlines 3750 on the same route92.9%
- 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.