Route reliability record
GJT→PHX
Grand Junction to Phoenix
- Flights
- 979
- Period
- September 2025 to August 2026
- Distance
- 438 mi
- Carriers
- 2
This route lands a B+, 5 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That rests on 979 GJT to PHX flights, with a median arrival 8 minutes early.
Best time to fly GJT to PHX: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 89.6% of the time and Wednesday flights 87.5%, against 82.7% for the route overall.
Set against the rest of the country, this route's record is 5 points better than the US average of 77.3%. That gap is worth roughly 54 fewer late arrivals for every thousand flights.
Key figures
On time
82.7%
Arrivals under 15 minutes late, of 969 completed flights
Avg delay
101 min
Across delayed arrivals only, not all flights
Cancelled
0.72%
National rate is 1.89%
Best carrier
SkyWest
83.3% on time across 948 flights
These figures cover 979 flights between September 2025 and August 2026. The median arrival is 8 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 GJT to PHX
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 | 83.3% | 105 min | 0.74% | B+ |
| Envoy Airthin sample | 31 | 64.5% | 38 min | 0.00% | D+ |
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 matters more here than the choice of carrier. The gap between the best and worst window is 21 points, against half a point between the best and worst carrier.
- 5am–8am261 flights89.6%
- 8am–11am109 flights85.0%
- 11am–2pm345 flights86.5%
- 2pm–5pm19 flights—
- 5pm–8pm245 flights68.4%
- 8pm–5am—
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.6% of the time, against 68.4% for the evening window. That is 21 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 345 flights scheduled in it.
Explore
Filter GJT to PHX 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 GJT to PHX, the best departure window is 5am–8am at 89.6% on time and the worst is 5pm–8pm at 68.4%, a wide gap of 21.2 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am89.6%
- 8–11am85.0%
- 11am–2pm86.5%
- 2–5pm—
- 5–8pm68.4%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
Twelve months, one bar each, drawn from the same 979 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
July is the worst month at 78.0% on time, 11 points below December, the best at 89.0%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 91 flights.
Across the week, Wednesday is the strongest day at 87.5% on time and Sunday the weakest at 79.5%, a spread of 8 points.
Delay causes
Why this route gets delayed
Carrier accounts for 60% of the 17,000 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Carrier
- 21%Late-arriving aircraft
- 12%Extreme weather
- 7%National Airspace System
Extreme weather accounts for 12% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.0 times the usual weather exposure. The split is drawn from 16,919 reported delay minutes.
The largest share of delay minutes, 60%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 10,000 of the 17,000 delay minutes reported here.
Cancellations are rare at 0.72%, 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
6.6% 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.
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 5am–8am window matters as much as it does.
The return leg runs 80.4% on time across 978 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. 979 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 PHX after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 979 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 82.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 969 completed flights over 12 months sit behind that.
Common questions
GJT to PHX questions
How often is GJT to PHX delayed?
About one flight in six arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 17.3% of the 979 flights in this analysis, against 22.7% nationally. Delayed flights are late by close to two hours on average.
How reliable is GJT to PHX compared with the rest of the country?
82.7% of flights arrive on time here against a national 77.3%, a difference of 5 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on GJT to PHX?
The 5am–8am departure window is the strongest at 89.6% on time. The 5pm–8pm window is the weakest at 68.4%, 21 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 July delays on GJT to PHX?
July is the weakest month at 78.0% on time, compared with 89.0% in December. Across the year that is 11 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
- PHX to GJT — the return legseparate record
- Phoenix Sky Harbor International (PHX) delay statistics
- GJT to DEN, a related route79.6%
- DEN to PHX, a related route75.6%
- GJT to DFW, a related route83.4%
- SkyWest Airlines on-time record83.3%
- Envoy Air on-time record64.5%
- 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. GJT to PHX and PHX to GJT 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.