Carrier route record
OOSEA→PHX
SkyWest Airlines · Seattle to Phoenix
- Flights
- 506
- Period
- July 2025 to June 2026
- Share of route
- 7%
- Carriers
- 7
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.
SkyWest on SEA to PHX lands a B+, 3 points better than the national rate of 77.6%. 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 is a workable record, not a spotless one. That rests on 506 flights. The strongest carrier on the route with a full sample, Envoy Air, flew 691 at 86.9% on time.
Envoy Air is the most reliable of the four carriers covered here at 86.9% on time across 691 flights.
Key figures
On time
80.2%
Arrivals under 15 minutes late, of 500 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
0.59%
National rate is 1.81%
Whole route
79.2%
Every carrier on SEA to PHX, 7,268 flights
These figures cover 506 flights between July 2025 and June 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.
Carrier by carrier
SkyWest against every carrier on SEA to PHX
SkyWest flew 506 of the 7,268 flights on SEA to PHX, about 7% of it. Its 80.2% on time is about level with the route as a whole at 79.2%. Ranked by on-time rate it is number four 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. Envoy Air arrives on time 86.9% 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 | 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 (this page) | 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 Envoy and Southwest is 18 points, wide enough that it should decide the booking. On a hundred trips that is 18 more arrivals inside the on-time window.
Departure window
When SkyWest runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 18 points, against 18 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am169 flights89.2%
- 8am–11am35 flights85.7%
- 11am–2pm153 flights76.3%
- 2pm–5pm45 flights75.0%
- 5pm–8pm103 flights71.6%
- 8pm–5am1 flights—
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.2% of the time, against 71.6% for the evening window. That is 18 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 169 flights scheduled in it.
Across the year
SkyWest on SEA to PHX through the year
Delays peak in November, when the on-time rate falls to 63.2%. August is the strongest month at 91.4%. Moving a flexible trip across that boundary buys 28 points. January was the busiest month here, with 75 flights.
Across the week, Friday is the strongest day at 86.1% on time and Saturday the weakest at 73.4%. 13 points is a smaller lever than departure hour, but it is free.
Delay causes
Why SkyWest runs late on this route
One category carries most of the weight here. Carrier accounts for 70% of the 7,464 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.
- 70%Carrier
- 14%Late-arriving aircraft
- 12%National Airspace System
- 4%Extreme weather
The largest share of delay minutes, 70%, 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 5,255 of the 7,464 delay minutes reported here. The split is drawn from 7,464 reported delay minutes.
Cancellations are rare at 0.59%, below the national 1.81% 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 costs
6.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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.
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 82.6% on time across 506 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. 506 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 SkyWest on SEA to PHX
Put together: treat all of this as provisional. 506 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 80.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 500 completed flights over 12 months sit behind that.
Related
Where to go next
- SEA to PHX, every carrier
- SkyWest on PHX to SEA, the return leg
- Envoy Air on SEA to PHX86.9%
- American Airlines on SEA to PHX84.8%
- Delta Air Lines on SEA to PHX82.6%
- Alaska Airlines on SEA to PHX79.0%
- Frontier Airlines on SEA to PHX70.4%
- Southwest Airlines on SEA to PHX69.0%
- SkyWest Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Phoenix Sky Harbor International (PHX) delay statistics
- Same route, different airline: where the carrier you pick matters most
- The best time of day to fly, according to 7.04 million flight records
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.