PlainFlights

Route · ATL → SEA · 2020–2025 BTS data

Atlanta to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ATL to SEA (Atlanta to Seattle) ranks #374 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
59 min
Delay when late
19,037
Flights
#374 of 4927
Corpus placement

Cancelled

1.0%

Best Month

Oct 2024 95%

Worst Month

Dec 2025 62%

Distance

2,182 mi

Carriers

2

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 269 103 3 1 DL,AS
Nov 2025 257 39 2 0 DL,AS
Oct 2025 295 53 3 1 AS,DL
Sep 2025 283 31 0 0 DL,AS
Aug 2025 315 74 1 0 AS,DL
Jul 2025 347 75 3 3 AS,DL
Jun 2025 328 94 4 1 AS,DL
May 2025 291 63 0 0 AS,DL
Apr 2025 244 52 3 0 DL,AS
Mar 2025 223 43 0 1 AS,DL
Feb 2025 184 52 0 0 AS,DL
Jan 2025 215 45 7 1 AS,DL
Dec 2024 270 31 0 1 AS,DL
Nov 2024 263 20 0 0 AS,DL
Oct 2024 299 15 0 0 AS,DL
Sep 2024 330 47 2 0 AS,DL
Aug 2024 374 71 0 1 AS,DL
Jul 2024 377 116 22 0 AS,DL
Jun 2024 348 93 0 0 AS,DL
May 2024 312 92 0 0 AS,DL
Apr 2024 269 39 0 0 AS,DL
Mar 2024 251 19 1 1 AS,DL
Feb 2024 211 20 1 0 AS,DL
Jan 2024 233 32 15 0 AS,DL

ATL–SEA seasonal on-time pattern

Best: September (88.3%) · weakest: July (76.2%)

75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 79%

Strongest calendar month

September

88.3% on-time · ~293 flights/mo

Busiest calendar month

August

~334 flights/mo avg

Weakest calendar month

July

76.2% on-time · ~328 flights/mo

Cancellation Rate

1.0%

67 of 6,788 flights

Diversion Rate

0.2%

11 of 6,788 flights

Explore origin & destination

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

ATL - Atlanta

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

ATL on-time profile

SEA - Seattle

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

SEA on-time profile

Compare the two airports

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

Compare ATL vs SEA

Origin-hub reliability standing

Mid-pack among ATL departures

From ATL, this corridor sits with 75 other 75–85% on-time routes out of 144 tracked departures, not the hub's reliability leaders (67 at ≥85%) and not the softest ( 2 below 75%). Destination: Seattle · fleet on-time rank #2125 of 4927.

What the Data Says About ATL to SEA

Bureau of Transportation Statistics records show Atlanta to Seattle (ATL to SEA) running a 82.5% on-time rate over 19,037 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 59.2 minutes. The 2,182-mile corridor is served by 2 carriers, and over the last 24 months 1.0% of 6,788 flights were cancelled, 0.2% diverted.

The monthly split is wide on this route: Oct 2024 posted the strongest performance at 95% on-time, while Dec 2025 came in at just 62% - a 33-point swing worth factoring into travel timing.

On the multi-year calendar, ATL–SEA peaks in September at 88.3% on-time while August carries the heaviest traffic (~334 flights per month) ; the softest month is July at 76.2%, a 12.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does ATL to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, ATL to SEA ranks #374 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 ATL to SEA? ▼
Flights from Atlanta to Seattle have a 82.5% on-time rate based on 19,037 flights. The average delay is 59.2 minutes. The best recent month was Oct 2024 with 95% on-time.
What is the cancellation rate for ATL to SEA? ▼
Over the last 24 months, 1.0% of flights on this route were cancelled (67 of 6,788 flights) and 0.2% were diverted.
How far is the flight from ATL to SEA? ▼
The flight distance from Atlanta (ATL) to Seattle (SEA) is approximately 2,182 miles. This route is served by 2 carriers.
When is the best time to fly from ATL to SEA? ▼
The best recent month for on-time performance was Oct 2024 (95% on-time). The worst was Dec 2025 (62% on-time). Consider booking during months with historically better performance.

Airports on this route

ATL Airport

Atlanta
SEA Airport

Seattle
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 ATL–SEA data

ATL–SEA 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 ATL and SEA airport profiles: delay causes and top routes differ even on the same corridor. ATL airport
  • If your dates flex, September (88.3% on-time) beats July (76.2%) 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.