Route
BWI → SEA
Baltimore/Washington International Thurgood Marshall Airport Seattle–Tacoma International Airport
2,335 miles
Return route SEA → BWI →
How punctual is this route?
- On-time arrivals
- 66.8%
- Less than 15 minutes late
- Cancelled
- 0.8%
- Of scheduled flights
- Average delay when late
- 56 min
- Flights arriving 15+ minutes late
- Flights tracked
- 719
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 39%
- Late-arriving aircraft 29%
- Airline (crew, maintenance, cleaning) 16%
- Extreme weather 14%
- Security 2%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 85.6% | 90 |
| October 2025 | 89.1% | 56 |
| November 2025 | 78.0% | 50 |
| December 2025 | 32.2% | 60 |
| January 2026 | 65.7% | 37 |
| February 2026 | 75.0% | 28 |
| March 2026 | 38.7% | 31 |
| April 2026 | 70.3% | 37 |
| May 2026 | 74.1% | 58 |
| June 2026 | 64.4% | 87 |
| July 2026 | 72.2% | 92 |
| August 2026 | 49.5% | 93 |
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 | 599 | 68.2% | 0.8% | 53 min |
| Southwest Airlines | 120 | 59.7% | 0.8% | 68 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
Reviews
No reviews yet. Be the first to review this route.