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Route · PIT → SEA · 2020–2025 BTS data

Pittsburgh to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), PIT to SEA (Pittsburgh to Seattle) ranks #3912 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

79.6%
On-time
+0.6 pts
vs US avg
57 min
Delay when late
1,848
Flights
#3912 of 4927
Corpus placement

Cancelled

1.4%

Best Month

Jul 2024 92%

Worst Month

Jun 2025 53%

Distance

2,125 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Oct 2025 34 2 1 0 AS
Sep 2025 52 8 0 0 AS
Aug 2025 58 23 0 0 AS
Jul 2025 62 24 2 1 AS
Jun 2025 60 28 0 0 AS
May 2025 48 12 0 0 AS
Apr 2025 30 6 0 0 AS
Jan 2025 31 12 1 1 AS
Oct 2024 30 4 1 0 AS
Sep 2024 43 2 0 0 AS
Aug 2024 55 11 3 0 AS
Jul 2024 62 5 0 0 AS
Jun 2024 60 23 0 0 AS
May 2024 47 12 0 0 AS
Apr 2024 30 2 0 0 AS
Mar 2024 31 2 0 0 AS
Jan 2024 31 4 6 0 AS
Nov 2023 30 8 0 0 AS
Oct 2023 31 6 0 0 AS
Sep 2023 36 5 1 0 AS
Aug 2023 62 7 0 0 AS
Jul 2023 62 21 0 0 AS
Jun 2023 45 12 0 0 AS
May 2023 31 0 0 0 AS

PIT–SEA seasonal on-time pattern

Best: September (88.8%) · weakest: December (35.5%)

20%40%60%80%100% JanMarAprMayJunJulAugSepOctNovDec 35.5%

Strongest calendar month

September

88.8% on-time · ~39 flights/mo

Busiest calendar month

July

~52 flights/mo avg

Weakest calendar month

December

35.5% on-time · ~31 flights/mo

Cancellation Rate

1.4%

15 of 1,061 flights

Diversion Rate

0.2%

2 of 1,061 flights

Explore origin & destination

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

PIT - Pittsburgh

Full on-time, delay-cause, and seasonal performance for Pittsburgh, PA.

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

Compare PIT vs SEA

Origin-hub reliability standing

Mid-pack among PIT departures

From PIT, this corridor sits with 19 other 75–85% on-time routes out of 33 tracked departures, not the hub's reliability leaders (13 at ≥85%) and not the softest ( 1 below 75%). Destination: Seattle · fleet on-time rank #3316 of 4927.

What the Data Says About PIT to SEA

1,848 tracked flights put the PIT to SEA pairing (Pittsburgh to Seattle) at a 79.6% on-time rate, squarely in line with the wider network. Delays that do occur run 57.4 minutes on average. Across the 2,125-mile route and its 1 carrier, the trailing 24 months show 1.4% cancelled and 0.2% diverted (1,061 flights sampled).

The monthly split is wide on this route: Jul 2024 posted the strongest performance at 92% on-time, while Jun 2025 came in at just 53% - a 39-point swing worth factoring into travel timing.

On the multi-year calendar, PIT–SEA peaks in September at 88.8% on-time while July carries the heaviest traffic (~52 flights per month) ; the softest month is December at 35.5%, a 53.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does PIT to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, PIT to SEA ranks #3912 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 PIT to SEA? ▼
Flights from Pittsburgh to Seattle have a 79.6% on-time rate based on 1,848 flights. The average delay is 57.4 minutes. The best recent month was Jul 2024 with 92% on-time.
What is the cancellation rate for PIT to SEA? ▼
Over the last 24 months, 1.4% of flights on this route were cancelled (15 of 1,061 flights) and 0.2% were diverted.
How far is the flight from PIT to SEA? ▼
The flight distance from Pittsburgh (PIT) to Seattle (SEA) is approximately 2,125 miles. This route is served by 1 carrier.
When is the best time to fly from PIT to SEA? ▼
The best recent month for on-time performance was Jul 2024 (92% on-time). The worst was Jun 2025 (53% on-time). Consider booking during months with historically better performance.

Airports on this route

PIT Airport

Pittsburgh
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 PIT–SEA data

PIT–SEA is mid-pack at 79.6% on-time; month and carrier mix move more than the corridor headline.

  • Compare PIT and SEA airport profiles: delay causes and top routes differ even on the same corridor. PIT airport
  • If your dates flex, September (88.8% on-time) beats December (35.5%) on this corridor. Seasonal chart
  • 4 other routes post a similar 79.6% 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.