Flight number record

OO 3903

SkyWest Airlines · Oakland to Salt Lake City

Route: OAK → SLC
Departs: 17:05
Flights: 344
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3903, 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 3903 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 344 flights, with a median arrival 15 minutes early.

Set against the rest of the country, OO 3903's record is 14 points better than the US average of 77.3%. That gap is worth roughly 142 fewer late arrivals for every thousand flights.

On time

91.5%

Arrivals under 15 minutes late, of 343 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.89%

1 hour+ late

2.9%

National rate is 8.3%

These figures cover 344 flights between September 2025 and August 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.

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Schedule

When OO 3903 flies

OO 3903 flies OAK to SLC without a single fixed slot. Its most common scheduled departure was 17:05, used on 73 of 344 flights, with 16:51 (51 flights) and 17:00 (43 flights) next.

Departs 17:0573 flights21.2%
Departs 16:5151 flights14.8%
Departs 17:0043 flights12.5%

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 17:05 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 3903 runs 24 points better at 91.5%. 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 3903 next to OAK to SLC

Every carrier on OAK to SLC combined arrived on time 87.8% of the time across 1,621 flights, so OO 3903 is 4 points ahead of it. SkyWest flew 1,074 flights on the same city pair under all its flight numbers, including this one, and those ran 94.1% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 13 points.

OO 3903 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3903thin sample	344	91.5%	62 min	0.00%	A+
All SkyWest Airlines on OAK–SLC	1,074	94.1%	71 min	0.19%	A+
All carriers on OAK–SLC	1,621	87.8%	61 min	0.12%	A+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 3903 quarter by quarter

OO 3903 did not run the same all year. Its best quarter was Oct–Dec 2025 at 96.6% on time and its weakest Jul–Sep 2026 at 85.2%, a swing of 11 points on roughly 69 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 flights90.0%
Oct–Dec 202588 flights96.6%
Jan–Mar 202674 flights90.4%
Apr–Jun 202691 flights92.3%
Jul–Sep 202661 flights85.2%

Scale runs 75% to 100%.

By weekday, OO 3903 ranged from 87.5% on Sunday to 96.2% on Tuesday. With about 49 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late OO 3903 runs when it is late

OO 3903 often beats the schedule: 176 of 343 completed flights, 51%, arrived 15 minutes or more early. The 29 late arrivals split 10 under half an hour, 9 between 30 and 60 minutes, and 10 an hour or more.

15+ min early176 flights51.3%
Within 15 min138 flights40.2%
15–29 min late10 flights2.9%
30–59 min late9 flights2.6%
1–2 hours late7 flights2.0%
2+ hours late3 flights0.9%

Scale runs 0% to 100%.

Share of 343 completed flights by arrival against schedule.

7 of 30 late departures made up the time and arrived on time, 23% of them. Only 6 left on time and still arrived late.

The worst days

Worst days for OO 3903

The latest arrival of the period was on 5 July 2026, 4 hours 53 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.

The latest arrivals of OO 3903 in the period
Date	Arrived late by	Largest filed cause
5 July 2026	4 hours 53 minutes	Carrier
18 February 2026	2 hours 42 minutes	Carrier
6 April 2026	2 hours 7 minutes	Carrier
3 June 2026	1 hour 58 minutes	Carrier
12 April 2026	1 hour 52 minutes	Carrier

Delay causes

Why OO 3903 runs late

Carrier accounts for 79% of the 1,811 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
79%
Extreme weather
18%
National Airspace System
3%

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 3.0 times the usual weather exposure. The split is drawn from 1,811 delay minutes reported on OO 3903.

Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are 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 2.9% 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.

The 588 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.

OO 3903 is not only a OAK to SLC flight. It also flew SLC to OAK (344 flights, 90.4% 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. 344 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 3903
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SLC to OAKthin sample	344	90.4%	51 min	0.00%	A+

What to do with this

Booking OO 3903

For a booking, OO 3903 has one of the better records a US domestic flight can show: 91.5% on time and 0.00% 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