Flight number record

OO 3953

SkyWest Airlines · Seattle to Portland

Route: SEA → PDX
Departs: 07:25
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 3953, 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 3953 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 365 flights, with a median arrival 15 minutes early.

Set against the rest of the country, OO 3953's record is 16 points better than the US average of 77.6%. That gap is worth roughly 161 fewer late arrivals for every thousand flights.

On time

93.7%

Arrivals under 15 minutes late, of 364 completed flights

Avg delay

64 min

Across delayed arrivals only, not all flights

Cancelled

0.27%

National rate is 1.81%

1 hour+ late

2.5%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 15 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 3953 flies

OO 3953 flies SEA to PDX without a single fixed slot. Its most common scheduled departure was 07:25, used on 189 of 365 flights, with 07:15 (65 flights) and 07:30 (51 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:25189 flights51.8%
Departs 07:1565 flights17.8%
Departs 07:3051 flights14.0%

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 07:25 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 3953 runs 4 points better at 93.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 3953 next to SEA to PDX

Every carrier on SEA to PDX combined arrived on time 83.1% of the time across 4,778 flights, so OO 3953 is 11 points ahead of it. SkyWest flew 3,343 flights on the same city pair under all its flight numbers, including this one, and those ran 86.1% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 15 points.

OO 3953 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3953	365	93.7%	64 min	0.27%	A+
All SkyWest Airlines on SEA–PDX	3,343	86.1%	53 min	0.51%	A+
All carriers on SEA–PDX	4,778	83.1%	51 min	0.67%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3953 quarter by quarter

Quarter by quarter OO 3953 held fairly steady: 97.8% in Jul–Sep 2025, 93.4% in Oct–Dec 2025, 91.1% in Jan–Mar 2026 and 92.3% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights97.8%
Oct–Dec 202592 flights93.4%
Jan–Mar 202690 flights91.1%
Apr–Jun 202691 flights92.3%

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3953 ranged from 88.5% on Monday to 98.1% on Friday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why OO 3953 runs late

One category carries most of the weight here. Carrier accounts for 82% of the 1,478 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
82%
Extreme weather
18%
National Airspace System
0%

Extreme weather accounts for 18% 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 2.9 times the usual weather exposure. The split is drawn from 1,478 delay minutes reported on OO 3953.

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 2.5% 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.

OO 3953 is not only a SEA to PDX flight. It also flew PDX to SEA (365 flights, 81.5% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

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.

Other routes flown as OO 3953
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
PDX to SEA	365	81.5%	45 min	0.55%	B+

What to do with this

Booking OO 3953

For a booking, OO 3953 has one of the better records a US domestic flight can show: 93.7% 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