75% of DEN → DCA flights arrived on time in June-August 2026 (336 flights). The most reliable was UA 789, on time 89% of the time on this route. Morning flights did best (82%), afternoon flights worst (56%). Denver (DEN): no delay reported. Reagan National (DCA): no delay reported.
Best time of day to fly DEN → DCA
| Morning (before noon) | |
| Afternoon (noon-5 PM) |
Flights DEN → DCA, most reliable first
| Flight | Departs | On time on this route | Cancelled |
|---|---|---|---|
| UA 789 United | 9:30 AM | 0% | |
| F9 686 Frontier | 7:30 AM | 0% | |
| F9 688 Frontier | 11:25 AM | 1.3% | |
| F9 690 Frontier | 4:28 PM | 0% |
DEN conditions · DCA conditions · DCA → DEN · Cancellations
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From BTS on-time data, June-August 2026; flights with 20+ trips on this route. On-time rates cover each flight number's whole day, which can include other legs. Departure times are local.