Carrier route record

OOTUS→SEA

SkyWest Airlines · Tucson to Seattle

Flights: 371
Period: September 2025 to August 2026
Share of route: 35%
Carriers: 3

Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with SkyWest Airlines.

SkyWest on TUS to SEA 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 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 371 flights, with a median arrival 9 minutes early.

Set against the rest of the country, SkyWest's TUS to SEA record is 10 points better than the US average of 77.3%. That gap is worth roughly 95 fewer late arrivals for every thousand flights.

On time

86.8%

Arrivals under 15 minutes late, of 371 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.89%

Whole route

85.9%

Every carrier on TUS to SEA, 1,065 flights

These figures cover 371 flights between September 2025 and August 2026. The median arrival is 9 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

SkyWest against every carrier on TUS to SEA

SkyWest flew 371 of the 1,065 flights on TUS to SEA, about 35% of it. Its 86.8% on time is about level with the route as a whole at 85.9%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Delta at 89.0% to Alaska at 84.6%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

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.

On-time performance by carrier on TUS to SEA
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Linesthin sample	138	89.0%	152 min	1.45%	A
SkyWest Airlines (this page)	371	86.8%	72 min	0.00%	A+
Alaska Airlines	556	84.6%	45 min	0.90%	B+

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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 11 points, against half a point between the best and worst carrier.

5am–8am116 flights90.5%
8am–11am28 flights—
11am–2pm179 flights88.3%
2pm–5pm48 flights79.2%
5pm–8pm—
8pm–5am—

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 90.5% of the time, against 79.2% for the afternoon window. That is 11 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 179 flights scheduled in it.

Across the year

SkyWest on TUS to SEA through the year

Jul–Sep 202560 flights86.7%
Oct–Dec 202583 flights85.5%
Apr–Jun 2026104 flights83.7%
Jul–Sep 2026124 flights90.3%

Scale runs 75% to 95%.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 86.8% on time across 371 flights.

Quarter by quarter SkyWest on TUS to SEA held fairly steady: 86.7% in Jul–Sep 2025, 85.5% in Oct–Dec 2025, 83.7% in Apr–Jun 2026 and 90.3% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Across the week, Saturday is the strongest day at 98.1% on time and Friday the weakest at 81.5%, a spread of 17 points.

Arrival by arrival

How late SkyWest on TUS to SEA runs when it is late

SkyWest on TUS to SEA often beats the schedule: 139 of 371 completed flights, 37%, arrived 15 minutes or more early. The 49 late arrivals split 23 under half an hour, 12 between 30 and 60 minutes, and 14 an hour or more.

15+ min early139 flights37.5%
Within 15 min183 flights49.3%
15–29 min late23 flights6.2%
30–59 min late12 flights3.2%
1–2 hours late7 flights1.9%
2+ hours late7 flights1.9%

Scale runs 0% to 100%.

Share of 371 completed flights by arrival against schedule.

7 of 39 late departures made up the time and arrived on time, 18% of them. 17 flights left on time and still arrived late.

The worst days

Worst days for SkyWest on TUS to SEA

The latest arrival of the period was on 3 June 2026, 10 hours 57 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across June, August, September and December, with no single month standing out.

The latest arrivals of SkyWest on TUS to SEA in the period
Date	Arrived late by	Largest filed cause
3 June 2026	10 hours 57 minutes	Late-arriving aircraft
20 August 2026	8 hours 47 minutes	Late-arriving aircraft
11 September 2025	2 hours 47 minutes	Extreme weather
16 December 2025	2 hours 41 minutes	Carrier
21 August 2026	2 hours 36 minutes	Carrier

Delay causes

Why SkyWest runs late on this route

Carrier accounts for 47% of the 3,515 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
47%
Late-arriving aircraft
38%
Extreme weather
8%
National Airspace System
7%

38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,515 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 3,515 reported delay minutes.

The largest share of delay minutes, 47%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,639 of the 3,515 delay minutes reported here.

Cancellations are rare at 0.00%, below the national 1.89% 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 3.8% land an hour or more behind schedule, against 8.3% 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 1,215 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.

The return leg runs 88.1% on time across 371 flights, within about 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. 371 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 TUS to SEA

Put together: treat all of this as provisional. 371 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 86.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 371 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures