Seattle (SEA) to Atlanta (ATL): On-Time Performance
Data through July 2026
Seattle (SEA) to Atlanta (ATL) effectively runs on two schedules. In February 2026, 91% of arrivals were on time; in July 2024 that fell to 67% — a 24-point seasonal swing. Across the full period the route averages 80% on-time against a national 78%.
- On-time
- 80%
- arrived <15 min late
- Avg delay
- 14 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 9.0
- last 12 months
- Duration
- 4h 49m
- scheduled
- Distance
- 2,182 mi
Best airline from SEA to ATL
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 83% | 15 min | 0.9% | 5,049 |
| Alaska Airlines | 74% | 12 min | 0.6% | 1,975 |
Monthly on-time trend
Best time to fly from SEA to ATL
Aim for departures around 6 a.m. (91% on-time); avoid 10 a.m. departures (63%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 13 min |
| Tuesdaybest | 85% | 14 min |
| Wednesday | 83% | 11 min |
| Thursday | 82% | 11 min |
| Friday | 78% | 15 min |
| Saturday | 80% | 16 min |
| Sunday | 75% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft21%
- Airline operations56%
- National airspace system19%
- Weather4%
Frequently asked questions
- How often are flights from SEA to ATL delayed?
- 20% of SEA–ATL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 14 minutes.
- Which airline is most reliable from SEA to ATL?
- Delta Air Lines has the best on-time record on this route at 83%, based on 5,049 flights. 2 airlines flew SEA–ATL frequently enough to compare in this period.
- What is the best time of day to fly from SEA to ATL?
- Departures around 6 a.m. have the best record (91% on-time), while departures around 10 a.m. have the worst (63%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to ATL?
- The scheduled SEA–ATL flight time averages 4h 49m over 2,182 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are SEA to ATL flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to ATL?
- July 2024 was the roughest month in this dataset, with only 67% of arrivals on time. The best was February 2026 at 91%. If your dates are flexible, that 24-point gap is worth planning around.
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Based on 7,024 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.