Route
SEA → DEN
Seattle–Tacoma International Airport Denver International Airport
How punctual is this route?
- On-time arrivals
- 78.3%
- Less than 15 minutes late
- Cancelled
- 0.7%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 6,333
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 36%
- Airline (crew, maintenance, cleaning) 30%
- Air traffic control & airport 29%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 75.9% | 574 |
| October 2025 | 83.2% | 557 |
| November 2025 | 86.1% | 466 |
| December 2025 | 80.5% | 468 |
| January 2026 | 87.4% | 429 |
| February 2026 | 85.1% | 403 |
| March 2026 | 79.2% | 455 |
| April 2026 | 87.6% | 470 |
| May 2026 | 82.6% | 546 |
| June 2026 | 72.2% | 635 |
| July 2026 | 68.2% | 678 |
| August 2026 | 63.8% | 652 |
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 |
|---|---|---|---|---|
| United Airlines | 1,910 | 88.2% | 0.6% | 79 min |
| Alaska Airlines | 1,552 | 78.2% | 0.6% | 53 min |
| Southwest Airlines | 1,342 | 67.3% | 0.7% | 60 min |
| Delta Air Lines | 869 | 72.9% | 0.9% | 61 min |
| Frontier Airlines | 439 | 76.0% | 0.9% | 77 min |
| SkyWest Airlines | 221 | 85.0% | 0.5% | 65 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA757
15% late · 365 flights
-
UA1505
9% late · 363 flights
-
AS602
25% late · 290 flights
-
F93406
25% late · 284 flights
-
AS682
14% late · 282 flights
-
DL2851
24% late · 255 flights
-
AS535
27% late · 217 flights
-
UA1218
16% late · 196 flights
-
AS642
17% late · 184 flights
-
UA2601
4% late · 166 flights
-
F91176
22% late · 155 flights
-
DL1358
19% late · 141 flights
-
UA1351
12% late · 134 flights
-
DL2740
14% late · 126 flights
-
OO4026
17% late · 122 flights
-
AS786
17% late · 115 flights
-
DL1750
18% late · 110 flights
-
DL1675
32% late · 108 flights
-
UA2269
0% late · 108 flights
-
DL2543
60% late · 86 flights
-
AS310
35% late · 83 flights
-
AS375
10% late · 70 flights
-
WN3485
13% late · 70 flights
-
AS242
41% late · 69 flights
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