Flight number record

OO 5377

SkyWest Airlines · Denver to Gunnison

Route: DEN → GUC
Departs: 19:15
Flights: 322
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5377, 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 5377 lands a B, level with the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 322 flights, with a median arrival 5 minutes early.

On time

78.2%

Arrivals under 15 minutes late, of 317 completed flights

Avg delay

98 min

Across delayed arrivals only, not all flights

Cancelled

1.24%

National rate is 1.81%

1 hour+ late

7.9%

National rate is 8.1%

These figures cover 322 flights between July 2025 and June 2026. The median arrival is 5 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 5377 flies

OO 5377 flies DEN to GUC without a single fixed slot. Its most common scheduled departure was 19:15, used on 92 of 322 flights, with 19:25 (81 flights) and 19:10 (67 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:1592 flights28.6%
Departs 19:2581 flights25.2%
Departs 19:1067 flights20.8%

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 19:15 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and OO 5377 runs 10 points better at 78.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

OO 5377 next to DEN to GUC

Every carrier on DEN to GUC combined arrived on time 81.3% of the time across 995 flights, so OO 5377 is 3 points behind it. Across its whole network SkyWest Airlines managed 79.0%, close to this flight's figure.

OO 5377 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5377thin sample	322	78.2%	98 min	1.24%	B
All SkyWest Airlines on DEN–GUC	995	81.3%	95 min	0.80%	B+
All carriers on DEN–GUC	995	81.3%	95 min	0.80%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5377 quarter by quarter

Quarter by quarter OO 5377 held fairly steady: 79.3% in Jul–Sep 2025, 80.0% in Oct–Dec 2025, 78.5% in Jan–Mar 2026 and 74.3% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights79.3%
Oct–Dec 202591 flights80.0%
Jan–Mar 202669 flights78.5%
Apr–Jun 202670 flights74.3%

Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5377 did best on Tuesday at 87.2% on time and worst on Monday at 71.7%. Each day rests on about 46 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5377 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,732 reported delay minutes.

National Airspace System
32%
Carrier
28%
Late-arriving aircraft
27%
Extreme weather
14%

Extreme weather accounts for 14% 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 2.2 times the usual weather exposure. The split is drawn from 6,732 delay minutes reported on OO 5377.

Cancellations sit at 1.24% against a national 1.81%, which is ordinary. Diversions add another 0.31%.

Connections and routes

What a delay on this flight costs

7.9% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.

The same number turns up on two other city pairs in the data, including SAF to DEN (94) and IAH to ICT (21), but none flew often enough under OO 5377 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to GUC only.

One caution: this is a thin sample. 322 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 5377

For a booking, read OO 5377 as 78.2% on time with 1.24% cancelled over 322 flights. Those are rates from the past twelve months, not a forecast for any particular 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