My trip
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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 → ORD
Seattle to Chicago · departing 11:40 PM
SEA → ORD flights departing 9 PM–5 AM arrive on time 80.9% of the time, against 77.3% across the whole day — your departure window is 3.6 points better than average for this route.
Your slot
Add a date above to see how that hour has done on your day of the week, and what a nearby slot would change.
Other times on SEA → ORD
Time of day
On SEA → ORD, flights leaving 5–9 AM arrived on time 85.6% of the time, against 80.9% for those leaving 9 PM–5 AM: 4.7 points more often.
- 5–9 AM85.6%
- 9 AM–12 PM74.8%
- 12–3 PM63.5%
- 3–6 PM77.2%
- 6–9 PM79.7%
- 9 PM–5 AM80.9%
Day of week
- Monday74.7%
- Tuesday80.5%
- Wednesday80.1%
- Thursday76.9%
- Friday75.4%
- Saturday79.9%
- Sunday74.6%
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 →
Which flight
Flights on SEA → ORD, the ones scheduled closest to 11:40 PM first.
Within 90 minutes of 11:40 PM, UA747 (usually 11:59 PM) has the best record: 84.7% on time and 0.80% cancelled over 1,124 flights, against 77.3% on time for SEA → ORD as a whole.
| Flight | Usually departs | On time | Cancelled |
|---|---|---|---|
| AS328Alaska AirlinesLive map | 11:40 PM | 78.2% | 0.48% |
| UA747United AirlinesLive map | 11:59 PM19 min away | 84.7% | 0.80% |
| AS538Alaska AirlinesLive map | 6:00 PM340 min away | 80.2% | 0.93% |
| DL2108Delta Air LinesLive map | 5:55 PM345 min away | 77.0% | 1.48% |
| AA2922American AirlinesLive map | 6:00 AM380 min away | 91.6% | 1.55% |
| UA2618United AirlinesLive map | 7:00 AM440 min away | 92.0% | 0.38% |
| DL2055Delta Air LinesLive map | 7:10 AM450 min away | 84.1% | 0.14% |
| AS265Alaska AirlinesLive map | 8:30 AM530 min away | 77.0% | 1.15% |
| DL637Delta Air LinesLive map | 10:35 AM655 min away | 70.9% | 1.87% |
| AS429Alaska AirlinesLive map | 10:50 AM670 min away | 56.3% | 1.94% |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Showing 10 of 11 flight numbers. “Usually departs” is the scheduled time each flight number most often had over the period; airlines retime flights, so confirm the time on your booking. Flight numbers with fewer than 90 operations on this route are left out. This is history, not a forecast for your flight.
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
Aviation weather is not currently a factor.
Minimal operational impact. Conditions are not a notable factor for operations right now.
UpdatedAviation 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.
Who flies this route
Performance by the carrier that actually operates the flight.
| Carrier | Flights | On time | Cancelled | Median delay |
|---|---|---|---|---|
| Alaska Airlines | 5,678 | 74.1% | 0.77% | -2 min |
| United Airlines | 4,762 | 82.0% | 0.94% | -7 min |
| American Airlines | 3,030 | 74.5% | 1.49% | -6 min |
| Delta Air Lines | 2,830 | 79.0% | 0.74% | -4 min |