Route Reliability
Seattle → Los Angeles
SEA–LAX · 954 miles · Seattle–Tacoma International Airport to Los Angeles International Airport
- 84%
- Arrive within 15 minutes
- 2 min
- Average arrival delay
- 0.9%
- Cancelled
- 7,429
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines92%942 flights
- 2.Delta Air Lines85%2,222 flights
- 3.Alaska Airlines81%3,308 flights
- 4.American Airlines81%696 flights
- 5.Frontier Airlines81%261 flights
What the data says
Morning-you made the right choice.
SEA–LAX flights departing between 6–9 AM arrived on time 90% of the time, versus 74% between 9 PM–12 AM.
Wednesday has been the better bet.
A small edge: 86% on time on Wednesdays against 81% on Sundays.
United Airlines runs this route best.
United Airlines arrived on time 92% of the time on this route; Frontier Airlines managed 81%.
Trending in the right direction.
SEA–LAX flights arrived on time 87% of the time over the last three months in the data, compared with 80% 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
- Mon83%(1121 flights)
- Tue86%(994 flights)
- Wed86%(977 flights)
- Thu82%(1106 flights)
- Fri82%(1096 flights)
- Sat85%(962 flights)
- Sun81%(1101 flights)
- 3–6 AM78%(40 flights)
- 6–9 AM90%(1749 flights)
- 9 AM–12 PM84%(1187 flights)
- 12–3 PM85%(1345 flights)
- 3–6 PM81%(1527 flights)
- 6–9 PM79%(1194 flights)
- 9 PM–12 AM74%(315 flights)
Jun 81% → May 88% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 81% | 632 |
| July 2025 | 78% | 639 |
| August 2025 | 81% | 636 |
| September 2025 | 89% | 603 |
| October 2025 | 87% | 610 |
| November 2025 | 86% | 593 |
| December 2025 | 75% | 621 |
| January 2026 | 82% | 560 |
| February 2026 | 83% | 553 |
| March 2026 | 84% | 623 |
| April 2026 | 90% | 608 |
| May 2026 | 88% | 679 |
Same trip, other airports
Keep nerding
Based on 7,429 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.