Flight number record

OO 5137

SkyWest Airlines · Hays to Denver

Route: HYS → DEN
Departs: 06:30
Flights: 327
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5137, 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 5137 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 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 3.5 hours. That rests on 327 flights, with a median arrival 15 minutes early.

Set against the rest of the country, OO 5137's record is 11 points better than the US average of 77.6%. That gap is worth roughly 106 fewer late arrivals for every thousand flights.

On time

88.2%

Arrivals under 15 minutes late, of 321 completed flights

Avg delay

210 min

Across delayed arrivals only, not all flights

Cancelled

1.83%

National rate is 1.81%

1 hour+ late

8.4%

National rate is 8.1%

These figures cover 327 flights between July 2025 and June 2026. Beyond the headline rate, 8.4% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When OO 5137 flies

OO 5137 flies HYS to DEN without a single fixed slot. Its most common scheduled departure was 06:30, used on 236 of 327 flights, with 06:35 (90 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:30236 flights72.2%
Departs 06:3590 flights27.5%

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 06:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 5137 runs level with that at 88.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

OO 5137 next to HYS to DEN

Every carrier on HYS to DEN combined arrived on time 80.7% of the time across 626 flights, so OO 5137 is 8 points ahead of it. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 9 points.

OO 5137 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5137thin sample	327	88.2%	210 min	1.83%	A
All SkyWest Airlines on HYS–DEN	626	80.7%	123 min	3.04%	B−
All carriers on HYS–DEN	626	80.7%	123 min	3.04%	B−
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5137 quarter by quarter

Quarter by quarter OO 5137 held fairly steady: 92.7% in Jul–Sep 2025, 91.3% in Oct–Dec 2025, 85.1% in Jan–Mar 2026 and 85.1% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202555 flights92.7%
Oct–Dec 202592 flights91.3%
Jan–Mar 202689 flights85.1%
Apr–Jun 202691 flights85.1%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, OO 5137 did best on Thursday at 97.8% on time and worst on Tuesday at 78.7%. Each day rests on about 47 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5137 runs late

One category carries most of the weight here. Carrier accounts for 54% of the 7,996 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
54%
Late-arriving aircraft
40%
Extreme weather
4%
National Airspace System
2%

40% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 7,996 reported delay minutes here, that single category outweighs weather by 9 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 7,996 delay minutes reported on OO 5137.

Cancellations sit at 1.83% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

8.4% 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 about 3.5 hours, which a normal layover absorbs.

The same number turns up on one other city pair in the data, including DEN to COD (12), but none flew often enough under OO 5137 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to HYS to DEN only.

One caution: this is a thin sample. 327 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 5137

For a booking, read OO 5137 as 88.2% on time with 1.83% cancelled over 327 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