PlainFlights

Route · MKE → SEA · 2020–2025 BTS data

Milwaukee to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), MKE to SEA (Milwaukee to Seattle) ranks #3776 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

84.7%
On-time
+5.7 pts
vs US avg
50 min
Delay when late
2,083
Flights
#3776 of 4927
Corpus placement

Cancelled

0.2%

Best Month

Jul 2024 92%

Worst Month

Jun 2024 80%

Distance

1,694 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 41 17 0 1 AS
Nov 2025 33 9 0 0 AS
Oct 2025 34 8 0 0 AS
Sep 2025 60 9 1 0 AS
Aug 2025 62 9 0 0 AS
Jul 2025 61 12 0 0 AS
Jun 2025 60 9 1 0 AS
May 2025 48 0 0 0 AS
Apr 2025 30 2 0 0 AS
Nov 2024 30 4 0 0 AS
Oct 2024 32 2 0 0 AS
Sep 2024 48 7 0 0 AS
Aug 2024 56 10 0 0 AS
Jul 2024 62 5 0 0 AS
Jun 2024 60 12 0 0 AS
May 2024 47 15 0 0 AS
Apr 2024 30 1 0 0 AS
Mar 2024 31 3 0 0 AS
Nov 2023 30 7 0 0 AS
Oct 2023 31 2 0 0 AS
Sep 2023 41 6 0 0 AS
Aug 2023 45 6 0 1 AS
Jul 2023 44 3 0 0 AS
Jun 2023 37 4 0 0 AS

MKE–SEA seasonal on-time pattern

Best: April (91.4%) · weakest: December (54.4%)

50%60%70%80%90%100% JanFebMarAprMayJunJulAugSepOctNovDec 54.4%

Strongest calendar month

April

91.4% on-time · ~31 flights/mo

Busiest calendar month

February

~49 flights/mo avg

Weakest calendar month

December

54.4% on-time · ~34 flights/mo

Cancellation Rate

0.2%

2 of 1,053 flights

Diversion Rate

0.2%

2 of 1,053 flights

Explore origin & destination

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

MKE - Milwaukee

Full on-time, delay-cause, and seasonal performance for Milwaukee, WI.

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

Compare MKE vs SEA

Origin-hub reliability standing

Mid-pack among MKE departures

From MKE, this corridor sits with 18 other 75–85% on-time routes out of 27 tracked departures, not the hub's reliability leaders (9 at ≥85%) and not the softest ( 0 below 75%). Destination: Seattle · fleet on-time rank #1337 of 4927.

What the Data Says About MKE to SEA

Bureau of Transportation Statistics records show Milwaukee to Seattle (MKE to SEA) running a 84.7% on-time rate over 2,083 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 50.3 minutes. The 1,694-mile corridor is served by 4 carriers, and over the last 24 months 0.2% of 1,053 flights were cancelled, 0.2% diverted.

Monthly performance varies moderately here: Jul 2024 was the strongest month at 92% on-time versus Jun 2024 at 80%, a 12-point difference.

On the multi-year calendar, MKE–SEA peaks in April at 91.4% on-time while February carries the heaviest traffic (~49 flights per month) ; the softest month is December at 54.4%, a 37.0-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does MKE to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, MKE to SEA ranks #3776 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 MKE to SEA? ▼
Flights from Milwaukee to Seattle have a 84.7% on-time rate based on 2,083 flights. The average delay is 50.3 minutes. The best recent month was Jul 2024 with 92% on-time.
What is the cancellation rate for MKE to SEA? ▼
Over the last 24 months, 0.2% of flights on this route were cancelled (2 of 1,053 flights) and 0.2% were diverted.
How far is the flight from MKE to SEA? ▼
The flight distance from Milwaukee (MKE) to Seattle (SEA) is approximately 1,694 miles. This route is served by 4 carriers.
When is the best time to fly from MKE to SEA? ▼
The best recent month for on-time performance was Jul 2024 (92% on-time). The worst was Jun 2024 (80% on-time). Consider booking during months with historically better performance.

Airports on this route

MKE Airport

Milwaukee
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 MKE–SEA data

MKE–SEA runs 5.7 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare MKE and SEA airport profiles: delay causes and top routes differ even on the same corridor. MKE airport
  • If your dates flex, April (91.4% on-time) beats December (54.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 84.7% 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.