ATL to SEA flight delays & on-time performance
Nonstop flights from Hartsfield Jackson Atlanta International Airport to Seattle–Tacoma International Airport · 2,182 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ATL or SEA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Atlanta (ATL) to Seattle (SEA) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0.6% were cancelled, and 6% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (78% on time); Alaska Airlines was the least (75%).
- Departures scheduled around 1pm did best (87% on time); around 7pm did worst (62%).
- Saturday was the most reliable day to fly (81% on time) and Sunday the least (73%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (50%).
Which airline is most on time from ATL to SEA?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 78% | 0.5% | 14 min | 5.3% | 2,380 |
| Alaska Airlines | 75% | 1.0% | 15 min | 6.4% | 898 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am92%50 flights
- 7am82%641 flights
- 8am80%59 flights
- 9am80%544 flights
- 11am83%264 flights
- 12pm78%166 flights
- 1pm87%134 flights
- 2pm75%93 flights
- 3pm81%72 flights
- 4pm70%354 flights
- 5pm51%37 flights
- 6pm71%174 flights
- 7pm62%335 flights
- 8pm67%67 flights
- 9pm78%281 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday74%0.8% cancelled
- Tuesday78%0.4% cancelled
- Wednesday78%0.2% cancelled
- Thursday79%0.4% cancelled
- Friday74%0.4% cancelled
- Saturday81%1.1% cancelled
- Sunday73%0.8% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)50%
- Air traffic control & airport congestion25%
- Late-arriving aircraft21%
- Extreme weather4%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)80%
- Extreme weather20%
- Air traffic control & airport congestion0%
- Security0%
ATL to SEA: common questions
- How often are ATL to SEA flights on time?
- 77% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Atlanta to Seattle cancelled?
- 0.6% of scheduled flights were cancelled (20 of 3,278).
- How long are typical delays?
- Across all flights the average arrival delay was 14 min (early arrivals count as zero). Flights that were late arrived 55 min behind schedule on average, and 5.6% of flights were an hour or more late.
- How long is taxi time at ATL?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SEA to ATL — 84% on time
More flights from Atlanta
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ATL → SEA, nonstop flights by US airlines that report to the DOT. How we calculate this.