Flight number record
OO 6318
SkyWest Airlines · Phoenix to Grand Junction
- Route
- PHX → GJT
- Departs
- 20:10
- Flights
- 281
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That rests on 281 flights, with a median arrival 7 minutes early.
Key figures
On time
80.7%
Arrivals under 15 minutes late, of 280 completed flights
Avg delay
116 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
8.2%
National rate is 8.3%
These figures cover 281 flights between September 2025 and August 2026. Beyond the headline rate, 8.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 6318 flies
OO 6318 flies PHX to GJT without a single fixed slot. Its most common scheduled departure was 20:10, used on 37 of 281 flights, with 21:48 (33 flights) and 18:50 (30 flights) next.
- Departs 20:1037 flights13.2%
- Departs 21:4833 flights11.7%
- Departs 18:5030 flights10.7%
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 20:10 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 6318 runs 11 points better at 80.7%. 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 6318 next to PHX to GJT
Every carrier on PHX to GJT combined arrived on time 80.4% of the time across 978 flights, so OO 6318 is about level with it. SkyWest flew 948 flights on the same city pair under all its flight numbers, including this one, and those ran 80.9% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 6318thin sample | 281 | 80.7% | 116 min | 0.00% | B+ |
| All SkyWest Airlines on PHX–GJT | 948 | 80.9% | 75 min | 0.53% | B+ |
| All carriers on PHX–GJT | 978 | 80.4% | 73 min | 0.51% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 6318 quarter by quarter
Quarter by quarter OO 6318 held fairly steady: 81.7% in Oct–Dec 2025, 85.5% in Jan–Mar 2026, 77.1% in Apr–Jun 2026 and 78.3% in Jul–Sep 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 20258 flights—
- Oct–Dec 202560 flights81.7%
- Jan–Mar 202669 flights85.5%
- Apr–Jun 202683 flights77.1%
- Jul–Sep 202661 flights78.3%
Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 6318 ranged from 73.8% on Friday to 82.9% on Saturday. With about 40 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 6318 runs when it is late
The 54 late arrivals split 14 under half an hour, 17 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early68 flights24.3%
- Within 15 min158 flights56.4%
- 15–29 min late14 flights5.0%
- 30–59 min late17 flights6.1%
- 1–2 hours late12 flights4.3%
- 2+ hours late11 flights3.9%
Scale runs 0% to 100%.
Share of 280 completed flights by arrival against schedule.
7 of 52 late departures made up the time and arrived on time, 13% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for OO 6318
The latest arrival of the period was on 19 June 2026, 12 hours 50 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.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 June 2026 | 12 hours 50 minutes | Carrier |
| 5 January 2026 | 12 hours 35 minutes | Carrier |
| 17 April 2026 | 12 hours 16 minutes | Carrier |
| 19 April 2026 | 12 hours 5 minutes | Carrier |
| 18 June 2026 | 4 hours 12 minutes | Late-arriving aircraft |
Delay causes
Why OO 6318 runs late
Carrier accounts for 70% of the 6,255 delay minutes carriers reported here, and the remaining four split what is left.
- 70%Carrier
- 18%Late-arriving aircraft
- 11%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 70%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,395 of the 6,255 delay minutes reported here. The split is drawn from 6,255 delay minutes reported on OO 6318.
Cancellations are rare at 0.00%, below the national 1.89% 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
8.2% of arrivals land an hour or more late, close to the national 8.3%, so 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 two other city pairs in the data, including GJT to PHX (4) and 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. 281 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 80.7% on time with 0.00% cancelled over 281 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- PHX to GJT, every carrier and departure
- GJT to PHX, the return direction
- Phoenix Sky Harbor International (PHX) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.