Route · SEA → MDW · 2020–2025 BTS data
Seattle to Chicago
The SEA–MDW corridor (Seattle, WA → Chicago, IL) runs ahead of the national average, served by 1 carrier across roughly 1,733 miles.
Data updated 2026-06-13
- 83.8%
- On-time
- +4.8 pts
- vs US avg
- 50 min
- Delay when late
- 3,126
- Flights
Cancelled
0.2%
Best Month
Jun 2025 74%
Worst Month
Jul 2024 65%
Distance
1,733 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 31 | 2 | 0 | 0 | WN |
| Nov 2025 | 30 | 2 | 0 | 1 | WN |
| Oct 2025 | 33 | 1 | 0 | 0 | WN |
| Sep 2025 | 86 | 26 | 0 | 0 | WN |
| Aug 2025 | 88 | 28 | 0 | 0 | WN |
| Jul 2025 | 88 | 28 | 1 | 2 | WN |
| Jun 2025 | 78 | 20 | 0 | 0 | WN |
| May 2025 | 31 | 2 | 0 | 0 | WN |
| Apr 2025 | 30 | 0 | 0 | 0 | WN |
| Mar 2025 | 31 | 3 | 0 | 0 | WN |
| Jan 2025 | 31 | 2 | 0 | 0 | WN |
| Dec 2024 | 31 | 0 | 0 | 0 | WN |
| Nov 2024 | 30 | 0 | 0 | 0 | WN |
| Oct 2024 | 35 | 4 | 0 | 0 | WN |
| Sep 2024 | 85 | 29 | 0 | 0 | WN |
| Aug 2024 | 88 | 28 | 0 | 2 | WN |
| Jul 2024 | 88 | 31 | 0 | 0 | WN |
| Jun 2024 | 80 | 26 | 0 | 0 | WN |
| May 2024 | 31 | 3 | 0 | 0 | WN |
| Apr 2024 | 30 | 3 | 0 | 0 | WN |
| Mar 2024 | 31 | 0 | 0 | 1 | WN |
| Jan 2024 | 31 | 5 | 1 | 0 | WN |
| Dec 2023 | 31 | 7 | 0 | 0 | WN |
| Nov 2023 | 30 | 3 | 0 | 0 | WN |
Cancellation Rate
0.2%
2 of 1,178 flights
Diversion Rate
0.5%
6 of 1,178 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.
Origin airport →MDW - Chicago
Full on-time, delay-cause, and seasonal performance for Chicago, IL.
Destination airport →Compare the two airports
See SEA and MDW side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to SEA–MDW.
Routes with a similar on-time rate
What the Data Says About SEA to MDW
Bureau of Transportation Statistics records show Seattle to Chicago (SEA to MDW) running a 83.8% on-time rate over 3,126 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 49.8 minutes. The 1,733-mile corridor is served by 1 carrier, and over the last 24 months 0.2% of 1,178 flights were cancelled, 0.5% diverted.
Monthly performance varies moderately here: Jun 2025 was the strongest month at 74% on-time versus Jul 2024 at 65%, a 10-point difference.
Frequently Asked Questions
How often are flights delayed from SEA to MDW? ▼
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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.
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.