Flight number record

OO 5240

SkyWest Airlines · Denver to Grand Junction

Route: DEN → GJT
Departs: 21:05
Flights: 296
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 5240, 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 5240 lands a B+, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 296 flights, with a median arrival 10 minutes early.

On time

78.7%

Arrivals under 15 minutes late, of 296 completed flights

Avg delay

75 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

7.8%

National rate is 8.1%

These figures cover 296 flights between July 2025 and June 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.

Schedule

When OO 5240 flies

OO 5240 flies DEN to GJT without a single fixed slot. Its most common scheduled departure was 21:05, used on 90 of 296 flights, with 21:00 (84 flights) and 21:04 (45 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:0590 flights30.4%
Departs 21:0084 flights28.4%
Departs 21:0445 flights15.2%

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 21:05 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 5240 runs 8 points better at 78.7%. 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 5240 next to DEN to GJT

Every carrier on DEN to GJT combined arrived on time 79.5% of the time across 2,229 flights, so OO 5240 is about level with it. SkyWest flew 1,496 flights on the same city pair under all its flight numbers, including this one, and those ran 80.5% on time. Across its whole network SkyWest Airlines managed 79.0%, close to this flight's figure.

OO 5240 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 5240thin sample	296	78.7%	75 min	0.00%	B+
All SkyWest Airlines on DEN–GJT	1,496	80.5%	62 min	1.74%	B
All carriers on DEN–GJT	2,229	79.5%	65 min	1.21%	B
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 5240 quarter by quarter

OO 5240 did not run the same all year. Its best quarter was Oct–Dec 2025 at 94.8% on time and its weakest Apr–Jun 2026 at 70.3%, a swing of 25 points on roughly 74 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 202543 flights72.1%
Oct–Dec 202577 flights94.8%
Jan–Mar 202685 flights76.5%
Apr–Jun 202691 flights70.3%

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

By weekday, OO 5240 did best on Wednesday at 86.0% on time and worst on Friday at 71.4%. Each day rests on about 42 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 5240 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 47% of the 4,736 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.

Late-arriving aircraft
47%
Carrier
44%
National Airspace System
8%
Extreme weather
1%

47% 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 4,736 reported delay minutes here, that single category outweighs weather by 41 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 4,736 delay minutes reported on OO 5240.

Cancellations are rare at 0.00%, below the national 1.81% 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

7.8% 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 a little over an hour, which a normal layover absorbs.

The same number turns up on two other city pairs in the data, including BIL to DEN (49) and DEN to COS (19), but none flew often enough under OO 5240 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to GJT only.

One caution: this is a thin sample. 296 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 5240

For a booking, read OO 5240 as 78.7% on time with 0.00% cancelled over 296 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