Route
SEA → DCA
Seattle–Tacoma International Airport Ronald Reagan Washington National Airport
2,329 miles
Return route DCA → SEA →
How punctual is this route?
- On-time arrivals
- 82.6%
- Less than 15 minutes late
- Cancelled
- 1.4%
- Of scheduled flights
- Average delay when late
- 68 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,092
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 42%
- Airline (crew, maintenance, cleaning) 39%
- Late-arriving aircraft 12%
- Extreme weather 8%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 64.0% | 90 |
| October 2025 | 87.1% | 93 |
| November 2025 | 80.0% | 89 |
| December 2025 | 85.6% | 93 |
| January 2026 | 81.8% | 93 |
| February 2026 | 80.7% | 84 |
| March 2026 | 86.4% | 93 |
| April 2026 | 91.1% | 90 |
| May 2026 | 91.4% | 93 |
| June 2026 | 84.3% | 90 |
| July 2026 | 75.0% | 91 |
| August 2026 | 82.4% | 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 | 728 | 78.0% | 0.7% | 56 min |
| Delta Air Lines | 364 | 91.8% | 2.7% | 131 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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