Route Reliability
Philadelphia → Seattle
PHL–SEA · 2,379 miles · Philadelphia International Airport to Seattle–Tacoma International Airport
- 69%
- Arrive within 15 minutes
- 10 min
- Average arrival delay
- 1.7%
- Cancelled
- 1,269
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.American Airlines73%589 flights
- 2.Alaska Airlines65%656 flights
Not enough history to rank: Delta Air Lines (24 flights). We rank airlines only after 100 flights on the route.
What the data says
Morning flights do better here.
PHL–SEA flights departing between 9 AM–12 PM arrived on time 94% of the time, versus 62% between 6–9 PM.
Friday is doing you no favors.
PHL–SEA flights arrived on time 76% of the time on Tuesdays. On Fridays: 65%.
American Airlines runs this route best.
American Airlines arrived on time 73% of the time on this route; Alaska Airlines managed 65%.
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
- Mon66%(178 flights)
- Tue76%(176 flights)
- Wed69%(172 flights)
- Thu67%(182 flights)
- Fri65%(178 flights)
- Sat69%(179 flights)
- Sun70%(182 flights)
- 6–9 AM76%(484 flights)
- 9 AM–12 PM94%(33 flights)
- 3–6 PM74%(19 flights)
- 6–9 PM62%(711 flights)
Jun 56% → May 78% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 56% | 115 |
| July 2025 | 59% | 118 |
| August 2025 | 66% | 134 |
| September 2025 | 80% | 122 |
| October 2025 | 71% | 121 |
| November 2025 | 78% | 87 |
| December 2025 | 41% | 92 |
| January 2026 | 75% | 63 |
| February 2026 | 89% | 53 |
| March 2026 | 47% | 73 |
| April 2026 | 84% | 113 |
| May 2026 | 78% | 156 |
Keep nerding
Based on 1,269 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.