Flight number record
OO 3913
SkyWest Airlines · Seattle to Portland
- Route
- SEA → PDX
- Departs
- 20:59
- Flights
- 341
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3913, 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 3913 lands a B+, 4 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 45 minutes on average. That rests on 341 flights, with a median arrival 8 minutes early.
Key figures
On time
81.2%
Arrivals under 15 minutes late, of 340 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
0.29%
National rate is 1.89%
1 hour+ late
4.7%
National rate is 8.3%
These figures cover 341 flights between September 2025 and August 2026. The median arrival is 8 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 3913 flies
OO 3913 flies SEA to PDX without a single fixed slot. Its most common scheduled departure was 20:59, used on 82 of 341 flights, with 17:50 (58 flights) and 17:45 (51 flights) next.
- Departs 20:5982 flights24.0%
- Departs 17:5058 flights17.0%
- Departs 17:4551 flights15.0%
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 20:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 3913 runs 11 points better at 81.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 3913 next to SEA to PDX
Every carrier on SEA to PDX combined arrived on time 82.2% of the time across 4,826 flights, so OO 3913 is about level with it. SkyWest flew 3,375 flights on the same city pair under all its flight numbers, including this one, and those ran 84.6% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 3913thin sample | 341 | 81.2% | 47 min | 0.29% | B+ |
| All SkyWest Airlines on SEA–PDX | 3,375 | 84.6% | 52 min | 0.56% | B+ |
| All carriers on SEA–PDX | 4,826 | 82.2% | 49 min | 0.73% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 3913 quarter by quarter
OO 3913 did not run the same all year. Its best quarter was Oct–Dec 2025 at 89.5% on time and its weakest Jul–Sep 2026 at 61.3%, a swing of 28 points on roughly 85 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 202517 flights—
- Oct–Dec 202586 flights89.5%
- Jan–Mar 202685 flights86.9%
- Apr–Jun 202691 flights83.5%
- Jul–Sep 202662 flights61.3%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, OO 3913 did best on Tuesday at 92.0% on time and worst on Monday at 66.7%. Each day rests on about 49 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 3913 runs when it is late
The 64 late arrivals split 28 under half an hour, 20 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early78 flights22.9%
- Within 15 min198 flights58.2%
- 15–29 min late28 flights8.2%
- 30–59 min late20 flights5.9%
- 1–2 hours late12 flights3.5%
- 2+ hours late4 flights1.2%
Scale runs 0% to 100%.
Share of 340 completed flights by arrival against schedule.
10 of 62 late departures made up the time and arrived on time, 16% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for OO 3913
The latest arrival of the period was on 14 August 2026, 2 hours 42 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 August 2026 | 2 hours 42 minutes | Carrier |
| 11 March 2026 | 2 hours 41 minutes | Carrier |
| 5 June 2026 | 2 hours 26 minutes | National Airspace System |
| 19 January 2026 | 2 hours 17 minutes | Extreme weather |
| 28 November 2025 | 1 hour 54 minutes | Carrier |
Delay causes
Why OO 3913 runs late
Carrier accounts for 62% of the 3,034 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Carrier
- 25%Extreme weather
- 13%National Airspace System
Extreme weather accounts for 25% 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 4.1 times the usual weather exposure. The split is drawn from 3,034 delay minutes reported on OO 3913.
Cancellations are rare at 0.29%, 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 4.7% 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 PDX to SEA (210), but none flew often enough under OO 3913 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SEA to PDX only.
One caution: this is a thin sample. 341 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 3913
For a booking, read OO 3913 as 81.2% on time with 0.29% cancelled over 341 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to PDX, every carrier and departure
- PDX to SEA, the return direction
- SkyWest Airlines 3953 on the same route93.1%
- SkyWest Airlines 3802 on the same route85.0%
- SkyWest Airlines 3918 on the same route83.5%
- Alaska Airlines 498 on the same route72.4%
- SkyWest Airlines 3818 on the same route87.8%
- Seattle-Tacoma International (SEA) delay statistics
- Portland International (PDX) 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.