Route
SEA → BWI
Seattle–Tacoma International Airport Baltimore/Washington International Thurgood Marshall Airport
2,335 miles
Return route BWI → SEA →
How punctual is this route?
- On-time arrivals
- 80.7%
- Less than 15 minutes late
- Cancelled
- 0.7%
- Of scheduled flights
- Average delay when late
- 45 min
- Flights arriving 15+ minutes late
- Flights tracked
- 719
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 44%
- Airline (crew, maintenance, cleaning) 36%
- Air traffic control & airport 16%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 81.1% | 90 |
| October 2025 | 92.7% | 56 |
| November 2025 | 88.0% | 50 |
| December 2025 | 83.3% | 60 |
| January 2026 | 82.4% | 36 |
| February 2026 | 92.6% | 28 |
| March 2026 | 83.9% | 31 |
| April 2026 | 94.7% | 38 |
| May 2026 | 82.8% | 58 |
| June 2026 | 78.2% | 87 |
| July 2026 | 67.8% | 92 |
| August 2026 | 70.0% | 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 | 84.8% | 0.7% | 46 min |
| Southwest Airlines | 120 | 60.5% | 0.8% | 44 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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