SEA to ATL flight delays & on-time performance
Nonstop flights from Seattle–Tacoma International Airport to Hartsfield Jackson Atlanta International Airport · 2,182 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SEA or ATL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Seattle (SEA) to Atlanta (ATL) arrived on time 84% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.6% were cancelled, and 5% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (84% on time); Alaska Airlines was the least (82%).
- Departures scheduled around 6am did best (95% on time); around 9am did worst (77%).
- Wednesday was the most reliable day to fly (90% on time) and Sunday the least (78%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (59%).
Which airline is most on time from SEA to ATL?
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 | 84% | 0.6% | 14 min | 4.9% | 2,380 |
| Alaska Airlines | 82% | 0.6% | 9 min | 3.5% | 897 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am95%364 flights
- 7am83%324 flights
- 8am82%169 flights
- 9am77%262 flights
- 10am86%51 flights
- 11am77%348 flights
- 1pm81%211 flights
- 2pm78%42 flights
- 3pm82%220 flights
- 4pm83%349 flights
- 5pm81%37 flights
- 9pm84%251 flights
- 10pm87%136 flights
- 11pm86%496 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday82%0.8% cancelled
- Tuesday87%0.0% cancelled
- Wednesday90%0.7% cancelled
- Thursday86%0.2% cancelled
- Friday79%1.0% cancelled
- Saturday81%0.7% cancelled
- Sunday78%0.6% 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)59%
- Late-arriving aircraft21%
- Air traffic control & airport congestion16%
- Extreme weather4%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)74%
- Extreme weather26%
- Air traffic control & airport congestion0%
- Security0%
SEA to ATL: common questions
- How often are SEA to ATL flights on time?
- 84% 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 Seattle to Atlanta cancelled?
- 0.6% of scheduled flights were cancelled (19 of 3,277).
- How long are typical delays?
- Across all flights the average arrival delay was 13 min (early arrivals count as zero). Flights that were late arrived 72 min behind schedule on average, and 4.5% of flights were an hour or more late.
- How long is taxi time at SEA?
- Flights on this route spent 22 min taxiing from the gate to takeoff on average.
Related routes
Return trip: ATL to SEA — 77% on time
More flights from Seattle
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SEA → ATL, nonstop flights by US airlines that report to the DOT. How we calculate this.