PlainFlights

Route · SEA → MKE · 2020–2025 BTS data

Seattle to Milwaukee

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to MKE (Seattle to Milwaukee) ranks #3779 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

84.2%
On-time
+5.2 pts
vs US avg
50 min
Delay when late
2,082
Flights
#3779 of 4927
Corpus placement

Cancelled

0.0%

Best Month

Jun 2024 87%

Worst Month

Aug 2024 70%

Distance

1,694 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 42 9 0 0 AS
Nov 2025 33 7 0 0 AS
Oct 2025 33 1 0 0 AS
Sep 2025 60 12 0 0 AS
Aug 2025 62 11 0 1 AS
Jul 2025 61 13 0 0 AS
Jun 2025 60 9 0 1 AS
May 2025 49 9 0 0 AS
Apr 2025 30 3 0 0 AS
Nov 2024 30 2 0 0 AS
Oct 2024 31 3 0 0 AS
Sep 2024 48 9 0 0 AS
Aug 2024 56 17 0 0 AS
Jul 2024 62 17 0 0 AS
Jun 2024 60 8 0 0 AS
May 2024 48 10 0 0 AS
Apr 2024 30 6 0 0 AS
Mar 2024 31 1 0 0 AS
Nov 2023 30 5 0 0 AS
Oct 2023 31 5 0 0 AS
Sep 2023 41 10 0 0 AS
Aug 2023 45 7 0 1 AS
Jul 2023 44 4 0 0 AS
Jun 2023 37 10 0 0 AS

SEA–MKE seasonal on-time pattern

Best: March (90.9%) · weakest: December (73.1%)

70%75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 73.1%

Strongest calendar month

March

90.9% on-time · ~40 flights/mo

Busiest calendar month

February

~48 flights/mo avg

Weakest calendar month

December

73.1% on-time · ~35 flights/mo

Cancellation Rate

0.0%

0 of 1,054 flights

Diversion Rate

0.3%

3 of 1,054 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

MKE - Milwaukee

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

MKE on-time profile

Compare the two airports

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

Compare SEA vs MKE

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: Milwaukee · fleet on-time rank #1521 of 4927.

What the Data Says About SEA to MKE

Bureau of Transportation Statistics records show Seattle to Milwaukee (SEA to MKE) running a 84.2% on-time rate over 2,082 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 49.6 minutes. The 1,694-mile corridor is served by 4 carriers, and over the last 24 months 0.0% of 1,054 flights were cancelled, 0.3% diverted.

The monthly split is wide on this route: Jun 2024 posted the strongest performance at 87% on-time, while Aug 2024 came in at just 70% - a 17-point swing worth factoring into travel timing.

On the multi-year calendar, SEA–MKE peaks in March at 90.9% on-time while February carries the heaviest traffic (~48 flights per month) ; the softest month is December at 73.1%, a 17.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SEA to MKE rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SEA to MKE ranks #3779 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 MKE? ▼
Flights from Seattle to Milwaukee have a 84.2% on-time rate based on 2,082 flights. The average delay is 49.6 minutes. The best recent month was Jun 2024 with 87% on-time.
What is the cancellation rate for SEA to MKE? ▼
Over the last 24 months, 0.0% of flights on this route were cancelled (0 of 1,054 flights) and 0.3% were diverted.
How far is the flight from SEA to MKE? ▼
The flight distance from Seattle (SEA) to Milwaukee (MKE) is approximately 1,694 miles. This route is served by 4 carriers.
When is the best time to fly from SEA to MKE? ▼
The best recent month for on-time performance was Jun 2024 (87% on-time). The worst was Aug 2024 (70% on-time). Consider booking during months with historically better performance.

Airports on this route

SEA Airport

Seattle
MKE Airport

Milwaukee
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–MKE data

SEA–MKE runs 5.2 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SEA and MKE airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
  • If your dates flex, March (90.9% on-time) beats December (73.1%) on this corridor. Seasonal chart
  • 4 other routes post a similar 84.2% 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.