Flight number record

OO 6318

SkyWest Airlines · Phoenix to Grand Junction

Route: PHX → GJT
Departs: 21:45
Flights: 265
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s OO 6318, 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 6318 lands a B+, 3 points 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 close to two hours on average. That is a workable record, not a spotless one. That rests on 265 flights, with a median arrival 7 minutes early.

On time

80.8%

Arrivals under 15 minutes late, of 265 completed flights

Avg delay

113 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

7.5%

National rate is 8.1%

These figures cover 265 flights between July 2025 and June 2026. The median arrival is 7 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 6318 flies

OO 6318 flies PHX to GJT without a single fixed slot. Its most common scheduled departure was 21:45, used on 43 of 265 flights, with 20:10 (37 flights) and 18:50 (30 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:4543 flights16.2%
Departs 20:1037 flights14.0%
Departs 18:5030 flights11.3%

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 21:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 6318 runs 10 points better at 80.8%. 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 6318 next to PHX to GJT

Every carrier on PHX to GJT combined arrived on time 81.1% of the time across 983 flights, so OO 6318 is about level with it. SkyWest flew 944 flights on the same city pair under all its flight numbers, including this one, and those ran 81.6% on time. Across its whole network SkyWest Airlines managed 79.0%, which this flight beats by 2 points.

OO 6318 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
OO 6318thin sample	265	80.8%	113 min	0.00%	B+
All SkyWest Airlines on PHX–GJT	944	81.6%	76 min	0.32%	B+
All carriers on PHX–GJT	983	81.1%	73 min	0.31%	B+
SkyWest Airlines, whole network	852,935	79.0%	88 min	1.77%	B

Across the year

OO 6318 quarter by quarter

Quarter by quarter OO 6318 held fairly steady: 79.2% in Jul–Sep 2025, 81.7% in Oct–Dec 2025, 85.5% in Jan–Mar 2026 and 77.1% 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 202553 flights79.2%
Oct–Dec 202560 flights81.7%
Jan–Mar 202669 flights85.5%
Apr–Jun 202683 flights77.1%

Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, OO 6318 did best on Monday at 89.2% on time and worst on Friday at 71.1%. Each day rests on about 38 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why OO 6318 runs late

One category carries most of the weight here. Carrier accounts for 75% of the 5,759 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
75%
Late-arriving aircraft
16%
National Airspace System
7%
Extreme weather
1%

The largest share of delay minutes, 75%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 4,342 of the 5,759 delay minutes reported here. The split is drawn from 5,759 delay minutes reported on OO 6318.

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

7.5% 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 close to two hours, which a normal layover absorbs.

The same number turns up on one other city pair in the data, including ICT to DFW (1), but none flew often enough under OO 6318 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to PHX to GJT only.

One caution: this is a thin sample. 265 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 6318

For a booking, read OO 6318 as 80.8% on time with 0.00% cancelled over 265 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