Flight number record

OO 3777

SkyWest Airlines · Fresno to Salt Lake City

Route: FAT → SLC
Departs: 17:15
Flights: 345
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s OO 3777, 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 3777 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 about an hour. That rests on 345 flights, with a median arrival 11 minutes early.

Set against the rest of the country, OO 3777's record is 12 points better than the US average of 77.3%. That gap is worth roughly 122 fewer late arrivals for every thousand flights.

On time

89.5%

Arrivals under 15 minutes late, of 343 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

0.29%

National rate is 1.89%

1 hour+ late

2.6%

National rate is 8.3%

These figures cover 345 flights between September 2025 and August 2026. The median arrival is 11 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 3777 flies

OO 3777 flies FAT to SLC without a single fixed slot. Its most common scheduled departure was 17:15, used on 93 of 345 flights, with 17:10 (60 flights) and 17:13 (49 flights) next.

Departs 17:1593 flights27.0%
Departs 17:1060 flights17.4%
Departs 17:1349 flights14.2%

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 17:15 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 3777 runs 22 points better at 89.5%. 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 3777 next to FAT to SLC

Every carrier on FAT to SLC combined arrived on time 93.3% of the time across 1,365 flights, so OO 3777 is 4 points behind it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 11 points.

OO 3777 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 3777thin sample	345	89.5%	63 min	0.29%	A+
All SkyWest Airlines on FAT–SLC	1,365	93.3%	84 min	0.51%	A+
All carriers on FAT–SLC	1,365	93.3%	84 min	0.51%	A+
SkyWest Airlines, whole network	855,406	78.7%	88 min	1.79%	B

Across the year

OO 3777 quarter by quarter

OO 3777 did not run the same all year. Its best quarter was Oct–Dec 2025 at 95.9% on time and its weakest Jul–Sep 2026 at 68.9%, a swing of 27 points on roughly 86 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 202527 flights—
Oct–Dec 202575 flights95.9%
Jan–Mar 202690 flights93.3%
Apr–Jun 202691 flights94.5%
Jul–Sep 202662 flights68.9%

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 3777 ranged from 86.3% on Wednesday to 92.2% on Thursday. With about 49 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late OO 3777 runs when it is late

OO 3777 often beats the schedule: 136 of 343 completed flights, 40%, arrived 15 minutes or more early. The 36 late arrivals split 13 under half an hour, 14 between 30 and 60 minutes, and 9 an hour or more.

15+ min early136 flights39.7%
Within 15 min171 flights49.9%
15–29 min late13 flights3.8%
30–59 min late14 flights4.1%
1–2 hours late3 flights0.9%
2+ hours late6 flights1.7%

Scale runs 0% to 100%.

Share of 343 completed flights by arrival against schedule.

7 of 36 late departures made up the time and arrived on time, 19% of them. 7 flights left on time and still arrived late.

The worst days

Worst days for OO 3777

The latest arrival of the period was on 12 July 2026, 5 hours 36 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.

The latest arrivals of OO 3777 in the period
Date	Arrived late by	Largest filed cause
12 July 2026	5 hours 36 minutes	Carrier
12 September 2025	4 hours 23 minutes	Carrier
18 February 2026	3 hours 8 minutes	Extreme weather
12 June 2026	2 hours 57 minutes	Carrier
31 December 2025	2 hours 33 minutes	Carrier

Delay causes

Why OO 3777 runs late

Carrier accounts for 72% of the 2,253 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
72%
Extreme weather
24%
National Airspace System
4%

Extreme weather accounts for 24% 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 3.9 times the usual weather exposure. The split is drawn from 2,253 delay minutes reported on OO 3777.

Cancellations are rare at 0.29%, 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 2.6% 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 501 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 3777 is not only a FAT to SLC flight. It also flew SLC to FAT (345 flights, 92.2% 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. 345 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 3777
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
SLC to FATthin sample	345	92.2%	59 min	0.29%	A+

What to do with this

Booking OO 3777

For a booking, OO 3777 has one of the better records a US domestic flight can show: 89.5% on time and 0.29% 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