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Tell FlyerIntel where and when you are flying. It will show how that route actually performs at that time of day and on that day of the week, what both airports are doing right now, and when to get to the airport.
SEA → MDW
Seattle to Chicago · departing 11:40 PM
SEA → MDW flights departing 9 PM–5 AM arrive on time 74.9% of the time, against 79.5% across the whole day — your departure window is 4.6 points worse than average for this route.
There is no day-by-hour view for SEA → MDW: it has too few flights to fill 45 weekday-and-hour slots with 120 or more each.
Other times on SEA → MDW
Time of day
On SEA → MDW, flights leaving 5–9 AM arrived on time 91.9% of the time, against 74.9% for those leaving 9 PM–5 AM: 17.0 points more often.
- 5–9 AM91.9%
- 9 AM–12 PM81.2%
- 12–3 PM44.9%
- 3–6 PMToo few flights to score
- 6–9 PMToo few flights to score
- 9 PM–5 AM74.9%
Day of week
- Monday79.3%
- Tuesday82.0%
- Wednesday81.9%
- Thursday73.0%
- Friday76.6%
- Saturday82.0%
- Sunday82.1%
Bars start below the lowest figure so a real gap is visible; read the percentage, not the bar length. A time with too few flights to score is left unscored rather than guessed at.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · History describes what has happened on this route. It is not a prediction about your flight. Full route profile →
When to get to the airport
A starting point for SEA, not a promise about your day.
2h 0m before your 11:40 PM departure
How this was worked out
- It does not include your journey to the airport, parking, or a shuttle from a remote lot.
- International departures, and travel with children, checked pets or special assistance, need more time.
Both airports right now
Weather conditions are strongly associated with delays and cancellations.
Severe operational impact. Conditions of this kind are strongly associated with delays and cancellations.
- Visibility 1.5 statute miles.
- Cloud ceiling 100 feet.
Aviation weather is not currently a factor.
Minimal operational impact. Conditions are not a notable factor for operations right now.
UpdatedSource: NOAA Aviation Weather Center · Conditions describe the airfield, not your flight, and change quickly.
Other ways to make this journey
Airport pairings serving Seattle to Chicago.