Flight number record

OO 4017

SkyWest Airlines · Seattle to Pasco

Route: SEA → PSC
Departs: 22:50
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 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 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 365 flights, with a median arrival 9 minutes early.

Set against the rest of the country, OO 4017's record is 8 points better than the US average of 77.6%. That gap is worth roughly 75 fewer late arrivals for every thousand flights.

On time

85.1%

Arrivals under 15 minutes late, of 363 completed flights

Avg delay

106 min

Across delayed arrivals only, not all flights

Cancelled

0.27%

National rate is 1.81%

1 hour+ late

4.7%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 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.

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 79 of 365 flights, with 21:59 (77 flights) and 21:55 (53 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 22:5079 flights21.6%
Departs 21:5977 flights21.1%
Departs 21:5553 flights14.5%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 70.5%, and OO 4017 runs 15 points better at 85.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 4017 next to SEA to PSC

Every carrier on SEA to PSC combined arrived on time 83.9% of the time across 1,818 flights, so OO 4017 is about level with it. SkyWest flew 1,542 flights on the same city pair under all its flight numbers, including this one, and those ran 84.9% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 6 points.

OO 4017 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 4017	365	85.1%	106 min	0.27%	A+
All SkyWest Airlines on SEA–PSC	1,542	84.9%	66 min	0.71%	B+
All carriers on SEA–PSC	1,818	83.9%	60 min	0.99%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	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 90.2% on time and its weakest Jan–Mar 2026 at 78.4%, a swing of 12 points on roughly 91 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 202592 flights90.2%
Oct–Dec 202592 flights89.1%
Jan–Mar 202690 flights78.4%
Apr–Jun 202691 flights82.4%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, OO 4017 did best on Tuesday at 94.3% on time and worst on Thursday at 78.4%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 4017 runs late

One category carries most of the weight here. Carrier accounts for 58% of the 5,741 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
58%
Extreme weather
36%
National Airspace System
6%

Extreme weather accounts for 36% 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 5,741 delay minutes reported on OO 4017.

Cancellations are rare at 0.27%, below the national 1.81% 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 8.1% 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 365 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. 365 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, OO 4017 has one of the better records a US domestic flight can show: 85.1% on time and 0.27% cancelled. That is a base rate, not a promise about any single 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures