Best Time to Fly IAD to LGA: On-Time Stats by Hour & Airline
Washington Dulles International → LaGuardia
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 74.0% of Washington (IAD) to New York (LGA) flights arrived on time (999 scheduled flights). That is 3.7 points below the national average of 77.6%.
Republic Airways was the only reporting airline with regular flights on this route.
Over 24 months, Saturday was the most reliable day (85% on time) and June the worst month (58%).
The cancellation rate was 6.5% (US average 1.8%).
IAD to LGA on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airways | 74.0% | 72 min | 6.5% | 999 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to LGA
On-time arrival % by scheduled departure hour (local time), 1,838 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 83.0% | 3.5% | 287 |
| 12pm–1pm | 68.0% | 4.2% | 626 |
| 5pm–6pm | 70.5% | 7.7% | 418 |
| 6pm–7pm | Limited data | 5 | |
| 10pm–11pm | 78.6% | 5.8% | 502 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on IAD to LGA
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 82.6% | +8.4 pts | 0.0% | 46 |
| Christmas & New Year (Dec 20 - Jan 3) | 82.4% | +8.2 pts | 2.7% | 111 |
| Summer peak (Jun 15 - Aug 15) | 65.8% | -8.4 pts | 11.1% | 289 |
| All other days | 74.2% | — | 4.5% | 1,392 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).