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Route · CLE → SEA · 2020–2025 BTS data

Cleveland to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), CLE to SEA (Cleveland to Seattle) ranks #4286 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

78.9%
On-time
-0.1 pts
vs US avg
53 min
Delay when late
1,300
Flights
#4286 of 4927
Corpus placement

Cancelled

0.9%

Best Month

Aug 2023 90%

Worst Month

Jun 2024 60%

Distance

2,021 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Oct 2025 33 8 2 0 AS
Sep 2025 48 7 0 0 AS
Aug 2025 57 21 1 0 AS
Jul 2025 61 17 2 1 AS
Jun 2025 60 14 1 0 AS
May 2025 48 11 0 0 AS
Apr 2025 30 12 0 0 AS
Oct 2024 32 4 0 0 AS
Sep 2024 48 7 0 0 AS
Aug 2024 56 15 1 0 AS
Jul 2024 62 11 0 0 AS
Jun 2024 60 24 0 0 AS
May 2024 46 17 0 0 AS
Apr 2024 30 3 1 0 AS
Mar 2024 31 3 1 0 AS
Nov 2023 30 9 1 0 AS
Oct 2023 32 3 0 0 AS
Sep 2023 60 7 0 0 AS
Aug 2023 62 6 0 0 AS
Jul 2023 62 13 0 0 AS
Jun 2023 45 4 0 0 AS
May 2023 31 3 0 0 AS
Apr 2023 30 5 0 0 AS
Mar 2023 31 5 0 0 AS

CLE–SEA seasonal on-time pattern

Best: March (87.1%) · weakest: December (54.8%)

50%60%70%80%90% JanMarAprMayJunJulAugSepOctNovDec 54.8%

Strongest calendar month

March

87.1% on-time · ~31 flights/mo

Busiest calendar month

June

~55 flights/mo avg

Weakest calendar month

December

54.8% on-time · ~31 flights/mo

Cancellation Rate

0.9%

10 of 1,085 flights

Diversion Rate

0.1%

1 of 1,085 flights

Explore origin & destination

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

CLE - Cleveland

Full on-time, delay-cause, and seasonal performance for Cleveland, OH.

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

Compare CLE vs SEA

Origin-hub reliability standing

Mid-pack among CLE departures

From CLE, this corridor sits with 17 other 75–85% on-time routes out of 30 tracked departures, not the hub's reliability leaders (12 at ≥85%) and not the softest ( 1 below 75%). Destination: Seattle · fleet on-time rank #3540 of 4927.

What the Data Says About CLE to SEA

1,300 tracked flights put the CLE to SEA pairing (Cleveland to Seattle) at a 78.9% on-time rate, squarely in line with the wider network. Delays that do occur run 52.8 minutes on average. Across the 2,021-mile route and its 1 carrier, the trailing 24 months show 0.9% cancelled and 0.1% diverted (1,085 flights sampled).

The monthly split is wide on this route: Aug 2023 posted the strongest performance at 90% on-time, while Jun 2024 came in at just 60% - a 30-point swing worth factoring into travel timing.

On the multi-year calendar, CLE–SEA peaks in March at 87.1% on-time while June carries the heaviest traffic (~55 flights per month) ; the softest month is December at 54.8%, a 32.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does CLE to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, CLE to SEA ranks #4286 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 CLE to SEA? ▼
Flights from Cleveland to Seattle have a 78.9% on-time rate based on 1,300 flights. The average delay is 52.8 minutes. The best recent month was Aug 2023 with 90% on-time.
What is the cancellation rate for CLE to SEA? ▼
Over the last 24 months, 0.9% of flights on this route were cancelled (10 of 1,085 flights) and 0.1% were diverted.
How far is the flight from CLE to SEA? ▼
The flight distance from Cleveland (CLE) to Seattle (SEA) is approximately 2,021 miles. This route is served by 1 carrier.
When is the best time to fly from CLE to SEA? ▼
The best recent month for on-time performance was Aug 2023 (90% on-time). The worst was Jun 2024 (60% on-time). Consider booking during months with historically better performance.

Airports on this route

CLE Airport

Cleveland
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 CLE–SEA data

CLE–SEA is mid-pack at 78.9% on-time; month and carrier mix move more than the corridor headline.

  • Compare CLE and SEA airport profiles: delay causes and top routes differ even on the same corridor. CLE airport
  • If your dates flex, March (87.1% on-time) beats December (54.8%) on this corridor. Seasonal chart
  • 4 other routes post a similar 78.9% 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.