Flight number record

OO 3954

SkyWest Airlines · Seattle to Medford

Route: SEA → MFR
Departs: 21:45
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3954, 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 3954 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 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 365 flights, with a median arrival 10 minutes early.

Set against the rest of the country, OO 3954's record is 12 points better than the US average of 77.3%. That gap is worth roughly 119 fewer late arrivals for every thousand flights.

On time

89.2%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

74 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.89%

1 hour+ late

3.0%

National rate is 8.3%

These figures cover 365 flights between September 2025 and August 2026. The median arrival is 10 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 3954 flies

OO 3954 flies SEA to MFR without a single fixed slot. Its most common scheduled departure was 21:45, used on 79 of 365 flights, with 21:35 (79 flights) and 21:25 (74 flights) next.

Departs 21:4579 flights21.6%
Departs 21:3579 flights21.6%
Departs 21:2574 flights20.3%

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 21:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 3954 runs 19 points better at 89.2%. 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 3954 next to SEA to MFR

Every carrier on SEA to MFR combined arrived on time 86.2% of the time across 1,320 flights, so OO 3954 is 3 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 11 points.

OO 3954 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3954	365	89.2%	74 min	0.55%	A+
All SkyWest Airlines on SEA–MFR	1,320	86.2%	62 min	0.98%	A+
All carriers on SEA–MFR	1,320	86.2%	62 min	0.98%	A+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 3954 quarter by quarter

OO 3954 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Apr–Jun 2026 at 84.6%, a swing of 15 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 flights100.0%
Oct–Dec 202592 flights90.1%
Jan–Mar 202690 flights92.0%
Apr–Jun 202691 flights84.6%
Jul–Sep 202662 flights85.5%

Scale runs 75% to 100%.

By weekday, OO 3954 ranged from 84.9% on Monday to 92.2% on Wednesday. With about 52 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late OO 3954 runs when it is late

OO 3954 often beats the schedule: 118 of 362 completed flights, 33%, arrived 15 minutes or more early. The 39 late arrivals split 15 under half an hour, 13 between 30 and 60 minutes, and 11 an hour or more.

15+ min early118 flights32.6%
Within 15 min205 flights56.6%
15–29 min late15 flights4.1%
30–59 min late13 flights3.6%
1–2 hours late8 flights2.2%
2+ hours late3 flights0.8%

Scale runs 0% to 100%.

Share of 362 completed flights by arrival against schedule.

13 of 44 late departures made up the time and arrived on time, 30% of them. 8 flights left on time and still arrived late.

The worst days

Worst days for OO 3954

The latest arrival of the period was on 14 March 2026, 9 hours 58 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as extreme weather.

The latest arrivals of OO 3954 in the period
Date	Arrived late by	Largest filed cause
14 March 2026	9 hours 58 minutes	Carrier
13 December 2025	9 hours 25 minutes	Extreme weather
8 December 2025	2 hours 40 minutes	Extreme weather
5 June 2026	1 hour 46 minutes	National Airspace System
13 March 2026	1 hour 42 minutes	Extreme weather

Delay causes

Why OO 3954 runs late

Carrier accounts for 51% of the 2,866 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
51%
Extreme weather
43%
National Airspace System
6%

Extreme weather accounts for 43% 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 7.2 times the usual weather exposure. The split is drawn from 2,866 delay minutes reported on OO 3954.

Cancellations are rare at 0.55%, 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 3.0% 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 3954 in the data flew SEA to MFR. 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 3954

For a booking, OO 3954 has one of the better records a US domestic flight can show: 89.2% on time and 0.55% 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