Flight Reliability
UA 4803 · United Airlines
Milwaukee → Chicago (MKE–ORD)
72
Usually Fine
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 23 min
- Average arrival delay
- 2.2%
- Cancelled
- 5 min early
- Median arrival delay
Based on 363 historical flights. Data through May 2026.
What the data says
Tuesdays have been rough.
UA 4803 arrived on time 88% of the time on Thursdays and just 71% on Tuesdays. That gap is worth planning around.
Better than the MKE–ORD route average.
UA 4803 arrived on time 79% of the time, versus 68% across the MKE–ORD route.
Ticking up lately.
UA 4803 arrived on time 81% of the time over the last three months in the data, compared with 78% in the three months before that.
The breakdown
- Mon82%(51 flights)
- Tue71%(51 flights)
- Wed80%(49 flights)
- Thu88%(50 flights)
- Fri75%(52 flights)
- Sat82%(51 flights)
- Sun75%(51 flights)
94%
May
Jun 83% → May 94% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 83% | 30 |
| July 2025 | 77% | 31 |
| August 2025 | 77% | 30 |
| September 2025 | 77% | 30 |
| October 2025 | 87% | 31 |
| November 2025 | 68% | 28 |
| December 2025 | 77% | 31 |
| January 2026 | 60% | 30 |
| February 2026 | 96% | 27 |
| March 2026 | 76% | 29 |
| April 2026 | 74% | 27 |
| May 2026 | 94% | 31 |
- Departures on time
- 80%
- Diverted
- 0%
- Flights flown
- 355
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 363 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.