Carrier route record
MQSEA→PHX
Envoy Air · Seattle to Phoenix
- Flights
- 691
- Period
- July 2025 to June 2026
- Share of route
- 10%
- Carriers
- 7
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Envoy Air.
Envoy on SEA to PHX earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 691 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 1,765 at 82.6% on time.
Set against the rest of the country, Envoy's SEA to PHX record is 9 points better than the US average of 77.6%. That gap is worth roughly 93 fewer late arrivals for every thousand flights.
Key figures
On time
86.9%
Arrivals under 15 minutes late, of 686 completed flights
Avg delay
71 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.81%
Whole route
79.2%
Every carrier on SEA to PHX, 7,268 flights
These figures cover 691 flights between July 2025 and June 2026. The median arrival is 11 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.
Carrier by carrier
Envoy against every carrier on SEA to PHX
Envoy flew 691 of the 7,268 flights on SEA to PHX, about 10% of it. Its 86.9% on time is 8 points better than the route as a whole, which runs 79.2%. Ranked by on-time rate it is first of seven carriers on the route, where the range runs from Envoy at 86.9% to Southwest at 69.0%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 82.6% of the time; Southwest Airlines manages 69.0%. Sample sizes sit next to every figure, because a two-point gap across 1,036 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Air (this page) | 691 | 86.9% | 71 min | 0.00% | A+ |
| American Airlinesthin sample | 199 | 84.8% | 81 min | 0.50% | B+ |
| Delta Air Lines | 1,765 | 82.6% | 65 min | 0.85% | B+ |
| SkyWest Airlines | 506 | 80.2% | 75 min | 0.59% | B+ |
| Alaska Airlines | 2,906 | 79.0% | 45 min | 0.65% | B+ |
| Frontier Airlinesthin sample | 165 | 70.4% | 126 min | 3.64% | C− |
| Southwest Airlines | 1,036 | 69.0% | 47 min | 0.68% | C+ |
The spread between Delta and Southwest is 14 points, wide enough that it should decide the booking. On a hundred trips that is 14 more arrivals inside the on-time window.
Departure window
When Envoy runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 14 points, against 14 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am193 flights93.3%
- 8am–11am36 flights88.9%
- 11am–2pm169 flights88.6%
- 2pm–5pm144 flights83.8%
- 5pm–8pm149 flights79.1%
- 8pm–5am—
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 93.3% of the time, against 79.1% for the evening window. That is 14 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 193 flights scheduled in it.
Across the year
Envoy on SEA to PHX through the year
December is the weak month at 73.7% on time, against 96.2% in April. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. May was the busiest month here, with 114 flights.
Across the week, Saturday is the strongest day at 94.4% on time and Friday the weakest at 79.2%. 15 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Envoy runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 53% of the 6,415 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.
- 53%Late-arriving aircraft
- 35%Carrier
- 12%National Airspace System
- 0%Extreme weather
53% 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 6,415 reported delay minutes here, that single category outweighs weather by 53 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 6,415 reported delay minutes.
The largest share of delay minutes, 35%, 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 2,266 of the 6,415 delay minutes reported here.
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 stage length
What a delay here costs
Badly late arrivals are rare here: only 4.1% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,107 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg runs 87.1% on time across 692 flights, within half a point 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. 691 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 Envoy on SEA to PHX
Put together: treat all of this as provisional. 691 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 86.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 686 completed flights over 12 months sit behind that.
Related
Where to go next
- SEA to PHX, every carrier
- Envoy on PHX to SEA, the return leg
- American Airlines on SEA to PHX84.8%
- Delta Air Lines on SEA to PHX82.6%
- SkyWest Airlines on SEA to PHX80.2%
- Alaska Airlines on SEA to PHX79.0%
- Frontier Airlines on SEA to PHX70.4%
- Southwest Airlines on SEA to PHX69.0%
- Envoy Air network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Phoenix Sky Harbor International (PHX) delay statistics
- Why the first flight of the morning is statistically safest
- Same route, different airline: where the carrier you pick matters most
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.