Route
SEA → SLC
Seattle–Tacoma International Airport Salt Lake City International Airport
How punctual is this route?
- On-time arrivals
- 83.4%
- Less than 15 minutes late
- Cancelled
- 0.8%
- Of scheduled flights
- Average delay when late
- 55 min
- Flights arriving 15+ minutes late
- Flights tracked
- 4,098
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 46%
- Late-arriving aircraft 39%
- Air traffic control & airport 12%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 88.9% | 398 |
| October 2025 | 85.6% | 365 |
| November 2025 | 87.5% | 297 |
| December 2025 | 76.6% | 305 |
| January 2026 | 82.4% | 301 |
| February 2026 | 83.8% | 294 |
| March 2026 | 84.7% | 334 |
| April 2026 | 92.4% | 314 |
| May 2026 | 85.2% | 338 |
| June 2026 | 83.8% | 359 |
| July 2026 | 76.6% | 411 |
| August 2026 | 75.3% | 382 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Delta Air Lines | 2,232 | 86.8% | 0.5% | 65 min |
| Alaska Airlines | 1,424 | 79.6% | 1.3% | 45 min |
| SkyWest Airlines | 365 | 79.7% | 0.0% | 50 min |
| Frontier Airlines | 77 | 73.0% | 3.9% | 55 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL1016
10% late · 365 flights
-
DL1120
17% late · 365 flights
-
DL1128
6% late · 365 flights
-
DL1265
15% late · 344 flights
-
DL1165
20% late · 302 flights
-
OO3298
21% late · 294 flights
-
AS733
32% late · 271 flights
-
DL1239
19% late · 256 flights
-
AS430
6% late · 205 flights
-
AS669
21% late · 117 flights
-
DL2858
7% late · 117 flights
-
AS720
19% late · 111 flights
-
F94988
27% late · 77 flights
-
AS630
16% late · 76 flights
-
AS292
9% late · 70 flights
-
AS360
16% late · 70 flights
-
AS373
26% late · 69 flights
-
DL2816
3% late · 69 flights
-
AS677
18% late · 61 flights
-
AS368
39% late · 56 flights
-
AS1125
14% late · 45 flights
-
AS1451
18% late · 34 flights
-
AS594
25% late · 33 flights
-
OO3331
9% late · 33 flights
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