Route reliability record
PHX→GJT
Phoenix to Grand Junction
- Flights
- 978
- Period
- September 2025 to August 2026
- Distance
- 438 mi
- Carriers
- 2
This route 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 a little over an hour on average. That rests on 978 PHX to GJT flights, with a median arrival 5 minutes early.
Best time to fly PHX to GJT: a 8am–11am departure, ideally on a Wednesday. Flights in that window arrived on time 84.3% of the time and Wednesday flights 84.0%, against 80.4% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.4%
Arrivals under 15 minutes late, of 971 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
0.51%
National rate is 1.89%
Best carrier
SkyWest
80.9% on time across 948 flights
These figures cover 978 flights between September 2025 and August 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.
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Carrier by carrier
Which airline is most reliable on PHX to GJT
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 948 | 80.9% | 75 min | 0.53% | B+ |
| Envoy Airthin sample | 30 | 66.7% | 33 min | 0.00% | C+ |
Flight by flight
Flights on PHX to GJT
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
The best time of day to leave
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 978 flights.
- 5am–8am—
- 8am–11am365 flights84.3%
- 11am–2pm1 flights—
- 2pm–5pm339 flights76.2%
- 5pm–8pm79 flights82.3%
- 8pm–5am194 flights79.7%
Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 84.3% of the time, against 76.2% for the afternoon window. That is 8 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 365 flights scheduled in it.
Explore
Filter PHX to GJT by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On PHX to GJT, the best departure window is 8am–11am at 84.3% on time and the worst is 2pm–5pm at 76.2%, a real gap of 8.1 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am84.3%
- 11am–2pm—
- 2–5pm76.2%
- 5–8pm82.3%
- 8pm–5am79.7%
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 17 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
Delays peak in March, when the on-time rate falls to 70.3%. December is the strongest month at 87.7%. Moving a flexible trip across that boundary buys 17 points. March was the busiest month here, with 91 flights.
Across the week, Wednesday is the strongest day at 84.0% on time and Friday the weakest at 75.9%, a spread of 8 points.
Delay causes
Why this route gets delayed
Carrier accounts for 58% of the 14,000 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Carrier
- 30%Late-arriving aircraft
- 10%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 58%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 7,983 of the 14,000 delay minutes reported here. The split is drawn from 13,872 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 84.3% on time here.
Cancellations are rare at 0.51%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here actually costs
6.4% 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 a little over an hour, which a normal layover absorbs.
At 438 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8am–11am window matters as much as it does.
The return leg runs 82.7% on time across 979 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 978 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.
Work out the risk of missing a connection in GJT after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 978 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 80.4% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 971 completed flights over 12 months sit behind that.
Common questions
PHX to GJT questions
How often is PHX to GJT delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 19.6% of the 978 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is PHX to GJT compared with the rest of the country?
80.4% of flights arrive on time here against a national 77.3%, a difference of 3 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on PHX to GJT?
The 8am–11am departure window is the strongest at 84.3% on time. The 2pm–5pm window is the weakest at 76.2%, 8 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are March delays on PHX to GJT?
March is the weakest month at 70.3% on time, compared with 87.7% in December. Across the year that is 17 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- GJT to PHX — the return legseparate record
- Phoenix Sky Harbor International (PHX) delay statistics
- PHX to DEN, a related route76.7%
- DEN to GJT, a related route79.9%
- PHX to LAX, a related route82.1%
- SkyWest Airlines on-time record80.9%
- Envoy Air on-time record66.7%
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. PHX to GJT and GJT to PHX are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.