Flight number record

OO 3873

SkyWest Airlines · Seattle to Lewiston

Route: SEA → LWS
Departs: 19:45
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3873, 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 3873 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 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 14 minutes early.

Set against the rest of the country, OO 3873's record is 13 points better than the US average of 77.3%. That gap is worth roughly 134 fewer late arrivals for every thousand flights.

On time

90.7%

Arrivals under 15 minutes late, of 364 completed flights

Avg delay

96 min

Across delayed arrivals only, not all flights

Cancelled

0.27%

National rate is 1.89%

1 hour+ late

2.2%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 2026. The median arrival is 14 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 3873 flies

OO 3873 flies SEA to LWS without a single fixed slot. Its most common scheduled departure was 19:45, used on 148 of 365 flights, with 21:35 (78 flights) next.

Departs 19:45148 flights40.5%
Departs 21:3578 flights21.4%

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 19:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 3873 runs 23 points better at 90.7%. 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 3873 next to SEA to LWS

Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 12 points.

OO 3873 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3873	365	90.7%	96 min	0.27%	A+
All SkyWest Airlines on SEA–LWS	365	90.7%	96 min	0.27%	A+
All carriers on SEA–LWS	365	90.7%	96 min	0.27%	A+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 3873 quarter by quarter

OO 3873 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jul–Sep 2026 at 82.3%, a swing of 14 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 flights96.7%
Oct–Dec 202592 flights94.6%
Jan–Mar 202690 flights91.0%
Apr–Jun 202691 flights90.1%
Jul–Sep 202662 flights82.3%

Scale runs 75% to 100%.

By weekday, OO 3873 did best on Tuesday at 98.1% on time and worst on Thursday at 82.7%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late OO 3873 runs when it is late

OO 3873 often beats the schedule: 175 of 364 completed flights, 48%, arrived 15 minutes or more early. The 34 late arrivals split 14 under half an hour, 12 between 30 and 60 minutes, and 8 an hour or more.

15+ min early175 flights48.1%
Within 15 min155 flights42.6%
15–29 min late14 flights3.8%
30–59 min late12 flights3.3%
1–2 hours late4 flights1.1%
2+ hours late4 flights1.1%

Scale runs 0% to 100%.

Share of 364 completed flights by arrival against schedule.

7 of 33 late departures made up the time and arrived on time, 21% of them. 8 flights left on time and still arrived late.

The worst days

Worst days for OO 3873

The latest arrival of the period was on 14 August 2026, 13 hours 33 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.

The latest arrivals of OO 3873 in the period
Date	Arrived late by	Largest filed cause
14 August 2026	13 hours 33 minutes	Carrier
12 December 2025	11 hours 18 minutes	Extreme weather
5 July 2026	8 hours 41 minutes	Carrier
16 July 2026	2 hours 54 minutes	Extreme weather
3 January 2026	1 hour 39 minutes	Carrier

Delay causes

Why OO 3873 runs late

Carrier accounts for 65% of the 3,275 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
65%
Extreme weather
31%
National Airspace System
3%

Extreme weather accounts for 31% 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 5.2 times the usual weather exposure. The split is drawn from 3,275 delay minutes reported on OO 3873.

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

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.

Every one of the 365 flights under OO 3873 in the data flew SEA to LWS. 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 3873

For a booking, OO 3873 has one of the better records a US domestic flight can show: 90.7% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures