Miami (MIA) to Seattle (SEA) flights
American Airlines, Alaska Airlines, Delta Air Lines fly nonstop from Miami International Airport to Seattle-Tacoma International Airport, with about 28 flights a week in July 2026. The 2,724-mile flight takes about 6h 40m gate to gate.
- Distance
- 2,724 mi · 4,384 km
- Flight time
- 6h 40m
- Airlines
- 3
- Seats filled
- 82%
Airlines flying MIA to SEA
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| American Airlines | 14 | Airbus A321, Boeing 737 MAX 8, Boeing 737-800 | 71,617 | 6h 34m |
| Alaska Airlines | 7 | Boeing 737 MAX 9, Boeing 737-900ER, Boeing 737-800 | 57,369 | 6h 45m |
| Delta Air Lines | 7 | Airbus A321, Boeing 737-800 | 53,716 | 6h 42m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
MIA to SEA flight schedule
5 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 8:08am and the last at 8:45pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| AA 545American Airlines | 8:08am | 11:58am | 17 | 100% |
| AA 654American Airlines | 8:20am | 11:56am | 4 | 93% |
| AS 305Alaska Airlines | 6:20pm | 10:00pm | 31 | 68% |
| DL 506Delta Air Lines | 6:25pm | 10:05pm | 31 | 61% |
| AA 3252American Airlines | 8:45pm | 12:20am | 31 | 68% |
Is MIA to SEA on time?
From September 2025 to August 2026, 69% of 1,233 flights arrived within 15 minutes of schedule and 1.1% were cancelled. Flights leaving around 8am were the most punctual (94%), those around 5pm the least (52%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (40%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| American Airlines | 475 | 73% | 15 min | 0.4% |
| Alaska Airlines | 392 | 69% | 16 min | 1.3% |
| Delta Air Lines | 366 | 63% | 34 min | 1.6% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 6am to 7am | 26 | 92% | |
| 7am to 8am | 53 | 72% | |
| 8am to 9am | 91 | 94% | |
| 5pm to 6pm | 148 | 52% | |
| 6pm to 7pm | 546 | 68% | |
| 7pm to 8pm | 183 | 69% | |
| 8pm to 9pm | 182 | 67% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 92 | 14,492 | |
| September 2025 | 90 | 11,542 | |
| October 2025 | 92 | 10,370 | |
| November 2025 | 95 | 13,254 | |
| December 2025 | 118 | 17,943 | |
| January 2026 | 101 | 16,342 | |
| February 2026 | 84 | 12,986 | |
| March 2026 | 88 | 14,778 | |
| April 2026 | 90 | 14,709 | |
| May 2026 | 103 | 17,047 | |
| June 2026 | 120 | 18,695 | |
| July 2026 | 123 | 20,544 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.