Route Reliability
Seattle → San Francisco
SEA–SFO · 679 miles · Seattle–Tacoma International Airport to San Francisco International Airport
- 70%
- Arrive within 15 minutes
- 13 min
- Average arrival delay
- 1.2%
- Cancelled
- 6,766
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.Delta Air Lines75%1,744 flights
- 2.United Airlines74%2,266 flights
- 3.Alaska Airlines63%2,752 flights
Not enough history to rank: Southwest Airlines (4 flights). We rank airlines only after 100 flights on the route.
What the data says
Morning flights do better here.
SEA–SFO flights departing between 3–6 AM arrived on time 92% of the time, versus 59% between 6–9 PM.
Sunday scaries are real for this one.
SEA–SFO flights arrived on time 77% of the time on Tuesdays. On Sundays: 65%.
Delta Air Lines runs this route best.
Delta Air Lines arrived on time 75% of the time on this route; Alaska Airlines managed 63%.
Recent months have been rougher.
SEA–SFO flights arrived on time 59% of the time over the last three months in the data, compared with 73% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon68%(1027 flights)
- Tue77%(913 flights)
- Wed71%(934 flights)
- Thu68%(995 flights)
- Fri66%(993 flights)
- Sat76%(837 flights)
- Sun65%(983 flights)
- 3–6 AM92%(227 flights)
- 6–9 AM65%(1315 flights)
- 9 AM–12 PM70%(1003 flights)
- 12–3 PM79%(1127 flights)
- 3–6 PM72%(1487 flights)
- 6–9 PM59%(1070 flights)
- 9 PM–12 AM68%(453 flights)
Jun 73% → May 42% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 73% | 626 |
| July 2025 | 72% | 627 |
| August 2025 | 74% | 613 |
| September 2025 | 76% | 580 |
| October 2025 | 74% | 579 |
| November 2025 | 73% | 556 |
| December 2025 | 67% | 554 |
| January 2026 | 77% | 480 |
| February 2026 | 75% | 475 |
| March 2026 | 83% | 515 |
| April 2026 | 51% | 495 |
| May 2026 | 42% | 582 |
Same trip, other airports
Keep nerding
Based on 6,766 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.