Route
SFO → SEA
San Francisco International Airport Seattle–Tacoma International Airport
Alerts at SFO and SEA
How punctual is this route?
- On-time arrivals
- 72.3%
- Less than 15 minutes late
- Cancelled
- 1.1%
- Of scheduled flights
- Average delay when late
- 60 min
- Flights arriving 15+ minutes late
- Flights tracked
- 6,821
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 47%
- Airline (crew, maintenance, cleaning) 26%
- Air traffic control & airport 22%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 78.0% | 585 |
| October 2025 | 73.2% | 585 |
| November 2025 | 79.4% | 565 |
| December 2025 | 73.7% | 559 |
| January 2026 | 83.6% | 485 |
| February 2026 | 86.4% | 481 |
| March 2026 | 86.9% | 528 |
| April 2026 | 69.6% | 496 |
| May 2026 | 62.1% | 594 |
| June 2026 | 60.1% | 633 |
| July 2026 | 62.3% | 666 |
| August 2026 | 62.2% | 644 |
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 |
|---|---|---|---|---|
| Alaska Airlines | 2,729 | 68.8% | 1.3% | 58 min |
| United Airlines | 2,063 | 75.1% | 0.4% | 61 min |
| SkyWest Airlines | 1,040 | 68.8% | 1.2% | 54 min |
| Delta Air Lines | 986 | 79.5% | 1.8% | 73 min |
| Southwest Airlines | 3 | 100.0% | 0.0% | — |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL2721
5% late · 349 flights
-
DL1412
26% late · 346 flights
-
OO3707
35% late · 331 flights
-
AS758
33% late · 297 flights
-
OO3991
36% late · 296 flights
-
UA2279
24% late · 296 flights
-
AS1327
32% late · 258 flights
-
AS591
32% late · 246 flights
-
UA1007
35% late · 236 flights
-
AS580
21% late · 234 flights
-
AS656
46% late · 233 flights
-
AS1340
35% late · 214 flights
-
AS68
16% late · 173 flights
-
UA2019
17% late · 160 flights
-
OO5579
29% late · 142 flights
-
UA1008
16% late · 131 flights
-
UA2340
19% late · 122 flights
-
UA1577
32% late · 111 flights
-
UA2744
25% late · 106 flights
-
AS416
7% late · 104 flights
-
UA433
15% late · 89 flights
-
AS316
32% late · 88 flights
-
DL2870
56% late · 86 flights
-
UA1265
42% late · 85 flights
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