Route
DEN → SEA
Denver International Airport Seattle–Tacoma International Airport
How punctual is this route?
- On-time arrivals
- 74.5%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 6,328
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 44%
- Airline (crew, maintenance, cleaning) 35%
- Air traffic control & airport 19%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 78.6% | 575 |
| October 2025 | 79.7% | 552 |
| November 2025 | 84.0% | 464 |
| December 2025 | 59.3% | 468 |
| January 2026 | 83.0% | 430 |
| February 2026 | 83.3% | 401 |
| March 2026 | 69.1% | 455 |
| April 2026 | 84.0% | 469 |
| May 2026 | 76.6% | 546 |
| June 2026 | 69.6% | 634 |
| July 2026 | 70.2% | 678 |
| August 2026 | 63.8% | 656 |
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 | 1,908 | 80.9% | 0.5% | 64 min |
| Alaska Airlines | 1,551 | 74.9% | 0.7% | 63 min |
| Southwest Airlines | 1,342 | 59.5% | 0.3% | 54 min |
| Delta Air Lines | 868 | 78.5% | 0.9% | 90 min |
| Frontier Airlines | 439 | 82.7% | 1.1% | 59 min |
| SkyWest Airlines | 220 | 75.8% | 0.5% | 74 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL1731
11% late · 364 flights
-
UA2271
8% late · 363 flights
-
AS643
11% late · 294 flights
-
UA2013
22% late · 291 flights
-
UA1424
14% late · 268 flights
-
F94545
18% late · 229 flights
-
UA2651
32% late · 218 flights
-
AS535
36% late · 216 flights
-
AS682
17% late · 214 flights
-
F91175
16% late · 189 flights
-
UA360
35% late · 155 flights
-
DL2740
18% late · 150 flights
-
AS785
32% late · 134 flights
-
DL1358
23% late · 117 flights
-
AS615
38% late · 100 flights
-
DL2543
47% late · 86 flights
-
UA1729
19% late · 86 flights
-
AS317
21% late · 83 flights
-
UA1482
7% late · 82 flights
-
AS381
26% late · 70 flights
-
AS249
52% late · 69 flights
-
UA2164
20% late · 69 flights
-
WN2628
45% late · 64 flights
-
OO3696
21% late · 62 flights
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