Best Time to Fly LGA to IAD: On-Time Stats by Hour & Airline
LaGuardia → Washington Dulles International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.8% of New York (LGA) to Washington (IAD) flights arrived on time (999 scheduled flights). That is 0.8 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 (83% on time) and July the worst month (67%).
The cancellation rate was 6.6% (US average 1.8%).
LGA to IAD 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 | 76.8% | 82 min | 6.6% | 999 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly LGA to IAD
On-time arrival % by scheduled departure hour (local time), 1,838 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 92.7% | 5.3% | 509 |
| 10am–11am | 86.0% | 2.8% | 287 |
| 2pm–3pm | 62.8% | 4.7% | 623 |
| 3pm–4pm | Limited data | 3 | |
| 7pm–8pm | 75.1% | 8.3% | 411 |
| 8pm–9pm | Limited data | 5 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on LGA to IAD
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) | 93.5% | +15.3 pts | 0.0% | 46 |
| Christmas & New Year (Dec 20 - Jan 3) | 77.1% | -1.1 pts | 2.7% | 112 |
| Summer peak (Jun 15 - Aug 15) | 70.5% | -7.7 pts | 11.5% | 288 |
| All other days | 78.2% | — | 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).