Carrier route record

MQPHX→SEA

Envoy Air · Phoenix to Seattle

Flights: 692
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 PHX to SEA earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 45 minutes. That rests on 692 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 1,764 at 87.8% on time.

Delta Air Lines is the most reliable of the four carriers covered here at 87.8% on time across 1,764 flights.

On time

87.1%

Arrivals under 15 minutes late, of 688 completed flights

Avg delay

45 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

Whole route

82.7%

Every carrier on PHX to SEA, 7,269 flights

These figures cover 692 flights between July 2025 and June 2026. The median arrival is 10 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 PHX to SEA

Envoy flew 692 of the 7,269 flights on PHX to SEA, about 10% of it. Its 87.1% on time is 4 points better than the route as a whole, which runs 82.7%. Ranked by on-time rate it is number two of seven carriers on the route, where the range runs from Delta at 87.8% to Southwest at 64.8%. 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 87.8% of the time; Southwest Airlines manages 64.8%. Sample sizes sit next to every figure, because a two-point gap across 1,037 flights means less than a ten-point one.

On-time performance by carrier on PHX to SEA
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	1,764	87.8%	73 min	0.85%	A+
Envoy Air (this page)	692	87.1%	45 min	0.00%	A+
Frontier Airlinesthin sample	165	86.1%	80 min	0.00%	A+
Alaska Airlines	2,903	84.9%	56 min	0.76%	B+
SkyWest Airlines	506	82.6%	61 min	0.59%	B+
American Airlinesthin sample	202	81.6%	53 min	0.50%	B+
Southwest Airlines	1,037	64.8%	43 min	0.58%	D+

The spread between Delta and Southwest is 23 points, wide enough that it should decide the booking. On a hundred trips that is 23 more arrivals inside the on-time window.

Departure window

When Envoy runs best on this route

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 692 flights.

5am–8am200 flights92.5%
8am–11am18 flights—
11am–2pm150 flights83.2%
2pm–5pm141 flights87.8%
5pm–8pm183 flights85.2%
8pm–5am—

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

The weak window here is the middle of the day, not the evening: 11am–2pm runs 83.2% on time against 92.5% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 5am–8am window is the busiest, with 200 flights scheduled in it.

Across the year

Envoy on PHX to SEA through the year

Darker means more delays. Figures are on-time percentages.February best, July worst

July is the worst month at 77.2% on time, 20 points below February, the best at 97.5%. 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. May was the busiest month here, with 114 flights.

Across the week, Monday is the strongest day at 91.5% on time and Thursday the weakest at 83.3%. 8 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 57% of the 3,957 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.

Late-arriving aircraft
57%
Carrier
27%
National Airspace System
16%

57% 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 3,957 reported delay minutes here, that single category outweighs weather by 57 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 3,957 reported delay minutes.

The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 92.5% on time 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 2.6% 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 86.9% on time across 691 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. 692 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 PHX to SEA

Put together: treat all of this as provisional. 692 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 87.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 688 completed flights over 12 months sit behind that.

Where to go next

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