Flight number record

OO 3818

SkyWest Airlines · Portland to Seattle

Route: PDX → SEA
Departs: 11:10
Flights: 318
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3818, 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 3818 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 318 flights, with a median arrival 12 minutes early.

Set against the rest of the country, OO 3818's record is 14 points better than the US average of 77.3%. That gap is worth roughly 136 fewer late arrivals for every thousand flights.

On time

90.9%

Arrivals under 15 minutes late, of 317 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

0.31%

National rate is 1.89%

1 hour+ late

2.2%

National rate is 8.3%

These figures cover 318 flights between September 2025 and August 2026. The median arrival is 12 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 3818 flies

OO 3818 flies PDX to SEA without a single fixed slot. Its most common scheduled departure was 11:10, used on 72 of 318 flights, with 11:35 (61 flights) and 10:42 (60 flights) next.

Departs 11:1072 flights22.6%
Departs 11:3561 flights19.2%
Departs 10:4260 flights18.9%

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 11:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and OO 3818 runs 13 points better at 90.9%. 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 3818 next to PDX to SEA

Every carrier on PDX to SEA combined arrived on time 84.9% of the time across 4,927 flights, so OO 3818 is 6 points ahead of it. SkyWest flew 3,472 flights on the same city pair under all its flight numbers, including this one, and those ran 85.5% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 12 points.

OO 3818 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3818thin sample	318	90.9%	63 min	0.31%	A+
All SkyWest Airlines on PDX–SEA	3,472	85.5%	59 min	0.58%	A+
All carriers on PDX–SEA	4,927	84.9%	54 min	0.71%	B+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 3818 quarter by quarter

Quarter by quarter OO 3818 held fairly steady: 93.3% in Jul–Sep 2025, 92.5% in Oct–Dec 2025, 92.9% in Jan–Mar 2026, 88.3% in Apr–Jun 2026 and 87.1% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202530 flights93.3%
Oct–Dec 202580 flights92.5%
Jan–Mar 202686 flights92.9%
Apr–Jun 202660 flights88.3%
Jul–Sep 202662 flights87.1%

Scale runs 80% to 100%.

By weekday, OO 3818 did best on Tuesday at 97.8% on time and worst on Friday at 84.1%. Each day rests on about 45 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 3818 runs when it is late

OO 3818 often beats the schedule: 126 of 317 completed flights, 40%, arrived 15 minutes or more early. Most of the lateness is short. 17 of the 29 late arrivals were under half an hour behind, and 7 reached an hour or more.

15+ min early126 flights39.7%
Within 15 min162 flights51.1%
15–29 min late17 flights5.4%
30–59 min late5 flights1.6%
1–2 hours late5 flights1.6%
2+ hours late2 flights0.6%

Scale runs 0% to 100%.

Share of 317 completed flights by arrival against schedule.

A late pushback is often recovered here: of 35 departures that left 15 minutes late or more, 14 still arrived on time. 8 flights left on time and still arrived late.

The worst days

Worst days for OO 3818

The latest arrival of the period was on 30 April 2026, 10 hours 48 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across April, July, June and January, with no single month standing out.

The latest arrivals of OO 3818 in the period
Date	Arrived late by	Largest filed cause
30 April 2026	10 hours 48 minutes	Carrier
16 July 2026	2 hours 55 minutes	National Airspace System
14 June 2026	1 hour 27 minutes	Extreme weather
4 April 2026	1 hour 25 minutes	Carrier
8 January 2026	1 hour 21 minutes	Extreme weather

Delay causes

Why OO 3818 runs late

Carrier accounts for 61% of the 1,830 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
61%
Extreme weather
21%
National Airspace System
18%

Extreme weather accounts for 21% 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 3.6 times the usual weather exposure. The split is drawn from 1,830 delay minutes reported on OO 3818.

Cancellations are rare at 0.31%, 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 2.2% 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.

OO 3818 is not only a PDX to SEA flight. It also flew SEA to PDX (256 flights, 87.8% 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. 318 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 3818
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SEA to PDXthin sample	256	87.8%	32 min	0.39%	A+

What to do with this

Booking OO 3818

For a booking, OO 3818 has one of the better records a US domestic flight can show: 90.9% on time and 0.31% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures