Flight number record

OO 4017

SkyWest Airlines · Seattle to Pasco

Route: SEA → PSC
Departs: 22:50
Flights: 364
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4017, 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 4017 lands a B+, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 364 flights, with a median arrival 8 minutes early.

Set against the rest of the country, OO 4017's record is 5 points better than the US average of 77.3%. That gap is worth roughly 50 fewer late arrivals for every thousand flights.

On time

82.3%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

99 min

Across delayed arrivals only, not all flights

Cancelled

0.27%

National rate is 1.89%

1 hour+ late

5.5%

National rate is 8.3%

These figures cover 364 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 4017 flies

OO 4017 flies SEA to PSC without a single fixed slot. Its most common scheduled departure was 22:50, used on 89 of 364 flights, with 21:59 (71 flights) and 21:50 (39 flights) next.

Departs 22:5089 flights24.5%
Departs 21:5971 flights19.5%
Departs 21:5039 flights10.7%

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 22:50 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 4017 runs 12 points better at 82.3%. 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 4017 next to SEA to PSC

Every carrier on SEA to PSC combined arrived on time 83.3% of the time across 1,678 flights, so OO 4017 is about level with it. SkyWest flew 1,465 flights on the same city pair under all its flight numbers, including this one, and those ran 83.8% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 4 points.

OO 4017 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4017thin sample	364	82.3%	99 min	0.27%	B+
All SkyWest Airlines on SEA–PSC	1,465	83.8%	65 min	0.75%	B+
All carriers on SEA–PSC	1,678	83.3%	61 min	0.95%	B+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 4017 quarter by quarter

OO 4017 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jul–Sep 2026 at 73.8%, a swing of 16 points on roughly 73 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 flights90.0%
Oct–Dec 202592 flights89.1%
Jan–Mar 202690 flights78.4%
Apr–Jun 202691 flights82.4%
Jul–Sep 202661 flights73.8%

Scale runs 65% to 95%.

By weekday, OO 4017 did best on Tuesday at 92.3% on time and worst on Friday at 72.5%. Each day rests on about 52 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 4017 runs when it is late

OO 4017 often beats the schedule: 116 of 362 completed flights, 32%, arrived 15 minutes or more early. The 64 late arrivals split 29 under half an hour, 15 between 30 and 60 minutes, and 20 an hour or more.

15+ min early116 flights32.0%
Within 15 min182 flights50.3%
15–29 min late29 flights8.0%
30–59 min late15 flights4.1%
1–2 hours late12 flights3.3%
2+ hours late8 flights2.2%

Scale runs 0% to 100%.

Share of 362 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 56 departures that left 15 minutes late or more, only 5 made it up before arrival. 13 flights left on time and still arrived late.

The worst days

Worst days for OO 4017

The latest arrival of the period was on 14 January 2026, 16 hours 41 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).

The latest arrivals of OO 4017 in the period
Date	Arrived late by	Largest filed cause
14 January 2026	16 hours 41 minutes	Extreme weather
16 February 2026	12 hours 17 minutes	Carrier
21 November 2025	11 hours 6 minutes	Extreme weather
4 January 2026	9 hours 48 minutes	Carrier
14 April 2026	8 hours 25 minutes	Carrier

Delay causes

Why OO 4017 runs late

Carrier accounts for 60% of the 6,329 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
60%
Extreme weather
35%
National Airspace System
5%

Extreme weather accounts for 35% 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 5.8 times the usual weather exposure. The split is drawn from 6,329 delay minutes reported on OO 4017.

Cancellations are rare at 0.27%, 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

5.5% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.

Every one of the 364 flights under OO 4017 in the data flew SEA to PSC. 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. 364 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 4017

For a booking, read OO 4017 as 82.3% on time with 0.27% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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 22 October 2026; recomputed monthly. How this data is collected.

Key figures