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Route · CMH → SEA · 2020–2025 BTS data

Columbus to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), CMH to SEA (Columbus to Seattle) ranks #4065 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

79.8%
On-time
+0.8 pts
vs US avg
54 min
Delay when late
1,617
Flights
#4065 of 4927
Corpus placement

Cancelled

0.4%

Best Month

Sep 2023 90%

Worst Month

Jul 2025 66%

Distance

2,016 mi

Carriers

2

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 31 19 0 0 AS
Oct 2025 33 8 0 0 AS
Sep 2025 52 6 0 0 UA,DL,WN,AA,AS
Aug 2025 57 15 0 0 AS
Jul 2025 61 21 1 0 AS
Jun 2025 60 20 0 0 AS
May 2025 48 12 0 0 AS
Apr 2025 30 8 1 0 AS
Nov 2024 30 1 1 0 AS
Oct 2024 31 2 0 1 AS
Sep 2024 48 10 0 0 AS
Aug 2024 56 15 0 1 AS
Jul 2024 62 12 0 0 AS
Jun 2024 60 17 0 0 AS
May 2024 46 9 0 0 AS
Apr 2024 30 6 0 0 AS
Mar 2024 31 4 1 0 AS
Nov 2023 30 2 0 0 AS
Oct 2023 32 3 0 0 AS
Sep 2023 60 6 0 0 AS
Aug 2023 62 10 0 0 AS
Jul 2023 62 16 0 0 AS
Jun 2023 45 8 0 0 AS
May 2023 31 6 0 0 AS

CMH–SEA seasonal on-time pattern

Best: November (95.0%) · weakest: December (45.2%)

40%60%80%100% MarAprMayJunJulAugSepOctNovDec 45.2%

Strongest calendar month

November

95.0% on-time · ~30 flights/mo

Busiest calendar month

July

~46 flights/mo avg

Weakest calendar month

December

45.2% on-time · ~31 flights/mo

Cancellation Rate

0.4%

4 of 1,088 flights

Diversion Rate

0.2%

2 of 1,088 flights

Explore origin & destination

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

CMH - Columbus

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

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

Compare CMH vs SEA

Origin-hub reliability standing

Mid-pack among CMH departures

From CMH, 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 #3215 of 4927.

What the Data Says About CMH to SEA

1,617 tracked flights put the CMH to SEA pairing (Columbus to Seattle) at a 79.8% on-time rate, squarely in line with the wider network. Delays that do occur run 53.7 minutes on average. Across the 2,016-mile route and its 2 carriers, the trailing 24 months show 0.4% cancelled and 0.2% diverted (1,088 flights sampled).

The monthly split is wide on this route: Sep 2023 posted the strongest performance at 90% on-time, while Jul 2025 came in at just 66% - a 24-point swing worth factoring into travel timing.

On the multi-year calendar, CMH–SEA peaks in November at 95.0% on-time while July carries the heaviest traffic (~46 flights per month) ; the softest month is December at 45.2%, a 49.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does CMH to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, CMH to SEA ranks #4065 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 CMH to SEA? ▼
Flights from Columbus to Seattle have a 79.8% on-time rate based on 1,617 flights. The average delay is 53.7 minutes. The best recent month was Sep 2023 with 90% on-time.
What is the cancellation rate for CMH to SEA? ▼
Over the last 24 months, 0.4% of flights on this route were cancelled (4 of 1,088 flights) and 0.2% were diverted.
How far is the flight from CMH to SEA? ▼
The flight distance from Columbus (CMH) to Seattle (SEA) is approximately 2,016 miles. This route is served by 2 carriers.
When is the best time to fly from CMH to SEA? ▼
The best recent month for on-time performance was Sep 2023 (90% on-time). The worst was Jul 2025 (66% on-time). Consider booking during months with historically better performance.

Airports on this route

CMH Airport

Columbus
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 CMH–SEA data

CMH–SEA is mid-pack at 79.8% on-time; month and carrier mix move more than the corridor headline.

  • Compare CMH and SEA airport profiles: delay causes and top routes differ even on the same corridor. CMH airport
  • If your dates flex, November (95.0% on-time) beats December (45.2%) on this corridor. Seasonal chart
  • 4 other routes post a similar 79.8% 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.