Flight number record

OO 3818

SkyWest Airlines · Portland to Seattle

Route: PDX → SEA
Departs: 11:10
Flights: 318
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 13 points better than the national rate of 77.6%. 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 13 points better than the US average of 77.6%. That gap is worth roughly 129 fewer late arrivals for every thousand flights.

On time

90.5%

Arrivals under 15 minutes late, of 317 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

0.31%

National rate is 1.81%

1 hour+ late

1.9%

National rate is 8.1%

These figures cover 318 flights between July 2025 and June 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.

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. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

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

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 11:10 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and OO 3818 runs 12 points better at 90.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

OO 3818 next to PDX to SEA

Every carrier on PDX to SEA combined arrived on time 84.8% of the time across 4,938 flights, so OO 3818 is 6 points ahead of it. SkyWest flew 3,501 flights on the same city pair under all its flight numbers, including this one, and those ran 85.2% on time. Across its whole network SkyWest Airlines managed 79.0%, 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	90.5%	57 min	0.31%	A+
All SkyWest Airlines on PDX–SEA	3,501	85.2%	59 min	0.54%	A+
All carriers on PDX–SEA	4,938	84.8%	55 min	0.65%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 3818 quarter by quarter

Quarter by quarter OO 3818 held fairly steady: 88.0% in Jul–Sep 2025, 92.5% in Oct–Dec 2025, 92.9% in Jan–Mar 2026 and 88.3% in Apr–Jun 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights88.0%
Oct–Dec 202580 flights92.5%
Jan–Mar 202686 flights92.9%
Apr–Jun 202660 flights88.3%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3818 did best on Tuesday at 100.0% on time and worst on Friday at 84.1%. Each day rests on about 45 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 3818 runs late

One category carries most of the weight here. Carrier accounts for 76% of the 1,723 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
76%
Extreme weather
17%
National Airspace System
7%

Extreme weather accounts for 17% 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 2.7 times the usual weather exposure. The split is drawn from 1,723 delay minutes reported on OO 3818.

Cancellations are rare at 0.31%, 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 1.9% 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 3818 is not only a PDX to SEA flight. It also flew SEA to PDX (256 flights, 91.4% 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	91.4%	38 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: 90.5% 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures