Flight Reliability
DL 4821 · Delta Air Lines
St. Louis → Minneapolis (STL–MSP)82% of its flights flew this route. The rest (ILM–ATL) are included in these numbers.
67
Usually Fine
WanderNerd Reliability Score
- 75%
- Arrive within 15 minutes
- 43 min
- Average arrival delay
- 0%
- Cancelled
- 4 min early
- Median arrival delay
Based on 72 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
DL 4821 arrived on time 91% of the time on Mondays and just 62% on Sundays. That gap is worth planning around.
A bit behind the STL–MSP route.
DL 4821 arrived on time 75% of the time, versus 81% across the STL–MSP route.
A bit behind the Delta Air Lines network.
DL 4821 arrived on time 75% of the time, versus 81% across the Delta Air Lines network.
The breakdown
- Mon91%(11 flights)
- Tue82%(11 flights)
- Wed73%(11 flights)
- Thu73%(11 flights)
- Fri73%(11 flights)
- Sat—(4 flights)
- Sun62%(13 flights)
- 12–3 PM—(9 flights)
- 3–6 PM73%(63 flights)
90%
Dec
Jun 65% → Dec 90% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 65% | 23 |
| July 2025 | 68% | 28 |
| December 2025 | 90% | 10 |
- Departures on time
- 68%
- Diverted
- 0%
- Flights flown
- 72
- Months covered
- 5
Same route, other flights
Keep nerding
Based on 72 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.