PlainFlights

Route · SEA → PIT · 2020–2025 BTS data

Seattle to Pittsburgh

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to PIT (Seattle to Pittsburgh) ranks #3952 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

78.4%
On-time
-0.6 pts
vs US avg
48 min
Delay when late
1,785
Flights
#3952 of 4927
Corpus placement

Cancelled

0.4%

Best Month

Sep 2025 85%

Worst Month

Aug 2025 66%

Distance

2,125 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Oct 2025 33 2 1 0 AS
Sep 2025 52 8 0 0 AS
Aug 2025 58 20 0 0 AS
Jul 2025 62 20 1 1 AS
Jun 2025 60 19 0 1 AS
May 2025 49 13 0 0 AS
Apr 2025 30 3 0 0 AS
Oct 2024 31 5 0 0 AS
Sep 2024 43 6 0 0 AS
Aug 2024 54 18 2 0 AS
Jul 2024 62 12 0 1 AS
Jun 2024 60 17 0 0 AS
May 2024 47 17 0 0 AS
Apr 2024 30 7 0 0 AS
Mar 2024 31 4 0 1 AS
Nov 2023 30 4 0 0 AS
Oct 2023 31 6 0 0 AS
Sep 2023 35 4 0 0 AS
Aug 2023 62 12 0 0 AS
Jul 2023 62 16 0 0 AS
Jun 2023 46 21 0 0 AS
May 2023 31 3 0 0 AS
Apr 2023 30 8 0 0 AS
Mar 2023 31 4 0 1 AS

SEA–PIT seasonal on-time pattern

Best: March (88.2%) · weakest: December (64.5%)

60%70%80%90% MarAprMayJunJulAugSepOctNovDec 64.5%

Strongest calendar month

March

88.2% on-time · ~31 flights/mo

Busiest calendar month

July

~52 flights/mo avg

Weakest calendar month

December

64.5% on-time · ~31 flights/mo

Cancellation Rate

0.4%

4 of 1,060 flights

Diversion Rate

0.5%

5 of 1,060 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

PIT - Pittsburgh

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

PIT on-time profile

Compare the two airports

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

Compare SEA vs PIT

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: Pittsburgh · fleet on-time rank #3729 of 4927.

What the Data Says About SEA to PIT

The Seattle to Pittsburgh corridor (SEA to PIT) posts a 78.4% on-time rate on the lower edge of the average band, based on 1,785 tracked flights. Late flights run 48.2 minutes behind on average. 1 carrier cover the 2,125-mile route; over the last 24 months, 4 of 1,060 flights were cancelled (0.4%) and 0.5% diverted.

The monthly split is wide on this route: Sep 2025 posted the strongest performance at 85% on-time, while Aug 2025 came in at just 66% - a 19-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–PIT peaks in March at 88.2% on-time while July carries the heaviest traffic (~52 flights per month) ; the softest month is December at 64.5%, a 23.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to PIT rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to PIT ranks #3952 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 PIT? ▼
Flights from Seattle to Pittsburgh have a 78.4% on-time rate based on 1,785 flights. The average delay is 48.2 minutes. The best recent month was Sep 2025 with 85% on-time.
What is the cancellation rate for SEA to PIT? ▼
Over the last 24 months, 0.4% of flights on this route were cancelled (4 of 1,060 flights) and 0.5% were diverted.
How far is the flight from SEA to PIT? ▼
The flight distance from Seattle (SEA) to Pittsburgh (PIT) is approximately 2,125 miles. This route is served by 1 carrier.
When is the best time to fly from SEA to PIT? ▼
The best recent month for on-time performance was Sep 2025 (85% on-time). The worst was Aug 2025 (66% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
PIT Airport

Pittsburgh
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–PIT data

SEA–PIT is mid-pack at 78.4% on-time; month and carrier mix move more than the corridor headline.

  • Compare SEA and PIT airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, March (88.2% on-time) beats December (64.5%) on this corridor. Seasonal chart
  • 4 other routes post a similar 78.4% 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.