PlainFlights

Route · DAL → SEA · 2020–2025 BTS data

Dallas to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), DAL to SEA (Dallas to Seattle) ranks #3872 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

75.1%
On-time
-3.9 pts
vs US avg
56 min
Delay when late
1,923
Flights
#3872 of 4927
Corpus placement

Cancelled

1.5%

Best Month

Aug 2023 91%

Worst Month

Jul 2023 78%

Distance

1,670 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Sep 2025 30 11 0 0 WN
Aug 2025 32 10 0 0 WN
Jul 2025 35 13 2 0 WN
Jun 2025 30 11 0 0 WN
Dec 2024 31 5 0 0 AS
Oct 2024 31 3 0 0 AS
Sep 2024 39 12 0 0 WN,AS
Aug 2024 41 17 0 0 AS,WN
Jul 2024 43 17 0 0 AS,WN
Jun 2024 40 5 0 0 AS,WN
Apr 2024 30 3 0 0 AS
Mar 2024 31 3 1 0 AS
Dec 2023 31 1 0 0 AS
Oct 2023 31 2 0 0 AS
Sep 2023 37 1 0 2 AS,WN
Aug 2023 64 6 0 3 AS,WN
Jul 2023 67 15 0 2 AS,WN
Jun 2023 48 10 1 4 AS,WN
May 2023 31 4 0 0 AS
Apr 2023 30 6 0 0 AS
Dec 2022 36 14 7 0 AS,WN
Nov 2022 32 4 2 0 WN,AS
Oct 2022 31 2 0 0 AS
Sep 2022 31 4 0 1 WN,AS

DAL–SEA seasonal on-time pattern

Best: March (88.8%) · weakest: July (60.5%)

50%60%70%80%90%100% JanMarAprMayJunJulAugSepOctNovDec 76.8%

Strongest calendar month

March

88.8% on-time · ~36 flights/mo

Busiest calendar month

June

~51 flights/mo avg

Weakest calendar month

July

60.5% on-time · ~50 flights/mo

Cancellation Rate

1.5%

13 of 882 flights

Diversion Rate

1.4%

12 of 882 flights

Explore origin & destination

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

DAL - Dallas

Full on-time, delay-cause, and seasonal performance for Dallas, TX.

DAL 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 DAL and SEA side by side on delays, cancellations, and reliability.

Compare DAL vs SEA

Origin-hub reliability standing

Mid-pack among DAL departures

From DAL, this corridor sits with 47 other 75–85% on-time routes out of 57 tracked departures, not the hub's reliability leaders (0 at ≥85%) and not the softest ( 10 below 75%). Destination: Seattle · fleet on-time rank #4448 of 4927.

What the Data Says About DAL to SEA

The Dallas to Seattle corridor (DAL to SEA) posts a 75.1% on-time rate on the lower edge of the average band, based on 1,923 tracked flights. Late flights run 56.4 minutes behind on average. 4 carriers cover the 1,670-mile route; over the last 24 months, 13 of 882 flights were cancelled (1.5%) and 1.4% diverted.

Monthly performance varies moderately here: Aug 2023 was the strongest month at 91% on-time versus Jul 2023 at 78%, a 13-point difference.

On the multi-year calendar, DAL–SEA peaks in March at 88.8% on-time while June carries the heaviest traffic (~51 flights per month) ; the softest month is July at 60.5%, a 28.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does DAL to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, DAL to SEA ranks #3872 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 DAL to SEA? ▼
Flights from Dallas to Seattle have a 75.1% on-time rate based on 1,923 flights. The average delay is 56.4 minutes. The best recent month was Aug 2023 with 91% on-time.
What is the cancellation rate for DAL to SEA? ▼
Over the last 24 months, 1.5% of flights on this route were cancelled (13 of 882 flights) and 1.4% were diverted.
How far is the flight from DAL to SEA? ▼
The flight distance from Dallas (DAL) to Seattle (SEA) is approximately 1,670 miles. This route is served by 4 carriers.
When is the best time to fly from DAL to SEA? ▼
The best recent month for on-time performance was Aug 2023 (91% on-time). The worst was Jul 2023 (78% on-time). Consider booking during months with historically better performance.

Airports on this route

DAL Airport

Dallas
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 DAL–SEA data

DAL–SEA is mid-pack at 75.1% on-time; month and carrier mix move more than the corridor headline.

  • Compare DAL and SEA airport profiles: delay causes and top routes differ even on the same corridor. DAL airport
  • If your dates flex, March (88.8% on-time) beats July (60.5%) on this corridor. Seasonal chart
  • 4 other routes post a similar 75.1% 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.