PlainFlights

Route · SEA → ATL · 2020–2025 BTS data

Seattle to Atlanta

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to ATL (Seattle to Atlanta) ranks #375 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

82.5%
On-time
+3.5 pts
vs US avg
69 min
Delay when late
19,031
Flights
#375 of 4927
Corpus placement

Cancelled

0.9%

Best Month

Sep 2025 90%

Worst Month

Jul 2024 69%

Distance

2,182 mi

Carriers

2

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 269 55 4 0 DL,AS
Nov 2025 256 33 1 2 AS,DL
Oct 2025 295 43 3 2 AS,DL
Sep 2025 284 28 0 0 DL,AS
Aug 2025 316 64 1 2 AS,DL
Jul 2025 347 106 1 1 AS,DL
Jun 2025 329 94 4 4 AS,DL
May 2025 292 58 0 2 AS,DL
Apr 2025 243 54 1 1 DL,AS
Mar 2025 224 27 1 1 AS,DL
Feb 2025 184 29 0 0 AS,DL
Jan 2025 215 35 7 0 AS,DL
Dec 2024 270 42 0 0 AS,DL
Nov 2024 263 33 0 0 AS,DL
Oct 2024 299 50 0 0 AS,DL
Sep 2024 330 69 2 2 AS,DL
Aug 2024 374 91 0 0 AS,DL
Jul 2024 377 116 22 0 AS,DL
Jun 2024 348 67 0 0 AS,DL
May 2024 312 63 0 1 AS,DL
Apr 2024 269 46 0 0 AS,DL
Mar 2024 251 42 0 0 AS,DL
Feb 2024 211 27 0 1 AS,DL
Jan 2024 233 44 16 1 AS,DL

SEA–ATL seasonal on-time pattern

Best: September (87.1%) · weakest: December (76.8%)

75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 76.8%

Strongest calendar month

September

87.1% on-time · ~293 flights/mo

Busiest calendar month

August

~334 flights/mo avg

Weakest calendar month

December

76.8% on-time · ~263 flights/mo

Cancellation Rate

0.9%

63 of 6,791 flights

Diversion Rate

0.3%

20 of 6,791 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

SEA - Seattle

Full on-time, delay-cause, and seasonal performance for Seattle, WA.

SEA on-time profile

ATL - Atlanta

Full on-time, delay-cause, and seasonal performance for Atlanta, GA.

ATL on-time profile

Compare the two airports

See SEA and ATL side by side on delays, cancellations, and reliability.

Compare SEA vs ATL

Origin-hub reliability standing

Mid-pack among SEA departures

From SEA, this corridor sits with 63 other 75–85% on-time routes out of 89 tracked departures, not the hub's reliability leaders (25 at ≥85%) and not the softest ( 1 below 75%). Destination: Atlanta · fleet on-time rank #2166 of 4927.

What the Data Says About SEA to ATL

Bureau of Transportation Statistics records show Seattle to Atlanta (SEA to ATL) running a 82.5% on-time rate over 19,031 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 69.1 minutes. The 2,182-mile corridor is served by 2 carriers, and over the last 24 months 0.9% of 6,791 flights were cancelled, 0.3% diverted.

The monthly split is wide on this route: Sep 2025 posted the strongest performance at 90% on-time, while Jul 2024 came in at just 69% - a 21-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–ATL peaks in September at 87.1% on-time while August carries the heaviest traffic (~334 flights per month) ; the softest month is December at 76.8%, a 10.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to ATL rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to ATL ranks #375 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from SEA to ATL? ▼
Flights from Seattle to Atlanta have a 82.5% on-time rate based on 19,031 flights. The average delay is 69.1 minutes. The best recent month was Sep 2025 with 90% on-time.
What is the cancellation rate for SEA to ATL? ▼
Over the last 24 months, 0.9% of flights on this route were cancelled (63 of 6,791 flights) and 0.3% were diverted.
How far is the flight from SEA to ATL? ▼
The flight distance from Seattle (SEA) to Atlanta (ATL) is approximately 2,182 miles. This route is served by 2 carriers.
When is the best time to fly from SEA to ATL? ▼
The best recent month for on-time performance was Sep 2025 (90% on-time). The worst was Jul 2024 (69% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
ATL Airport

Atlanta
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using SEA–ATL data

SEA–ATL runs 3.5 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SEA and ATL airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, September (87.1% on-time) beats December (76.8%) on this corridor. Seasonal chart
  • 4 other routes post a similar 82.5% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.