Route
SEA → DTW
Seattle–Tacoma International Airport Detroit Metropolitan Wayne County Airport
How punctual is this route?
- On-time arrivals
- 86.6%
- Less than 15 minutes late
- Cancelled
- 0.7%
- Of scheduled flights
- Average delay when late
- 72 min
- Flights arriving 15+ minutes late
- Flights tracked
- 2,063
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 53%
- Late-arriving aircraft 30%
- Air traffic control & airport 13%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 84.1% | 176 |
| October 2025 | 92.4% | 157 |
| November 2025 | 88.8% | 155 |
| December 2025 | 79.6% | 164 |
| January 2026 | 82.4% | 133 |
| February 2026 | 87.1% | 125 |
| March 2026 | 89.0% | 151 |
| April 2026 | 89.0% | 156 |
| May 2026 | 87.0% | 204 |
| June 2026 | 91.3% | 209 |
| July 2026 | 82.5% | 216 |
| August 2026 | 86.2% | 217 |
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 | 1,515 | 87.1% | 0.9% | 78 min |
| Alaska Airlines | 548 | 85.3% | 0.2% | 58 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL812
8% late · 365 flights
-
AS313
15% late · 362 flights
-
DL810
10% late · 361 flights
-
DL533
15% late · 320 flights
-
DL1706
19% late · 302 flights
-
DL2324
10% late · 127 flights
-
AS343
13% late · 82 flights
-
AS380
8% late · 51 flights
-
AS406
14% late · 28 flights
-
AS139
38% late · 24 flights
-
DL302
21% late · 24 flights
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