Best Time to Fly IAD to SAV: On-Time Stats by Hour & Airline
Washington Dulles International → Savannah/Hilton Head International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 89.2% of Washington (IAD) to Savannah (SAV) flights arrived on time (205 scheduled flights). That is 11.5 points above the national average of 77.6%.
Republic Airways was the most punctual of the 3 airlines on the route at 96.1%, while Allegiant Air trailed at 75.5%.
October has been the best month (93% on time) and Thursday the weakest day of the week (75%).
1.0% of flights were cancelled, versus 1.8% nationally.
IAD to SAV 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 | 96.1% | 26 min | 0.0% | 51 |
| United Airlines | 92.2% | 74 min | 1.0% | 104 |
| Allegiant Air | 75.5% | 192 min | 2.0% | 50 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAD to SAV
On-time arrival % by scheduled departure hour (local time), 286 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 93.1% | 1.7% | 59 |
| 9am–10am | 89.6% | 1.0% | 97 |
| 10am–11am | Limited data | 2 | |
| 11am–12pm | Limited data | 13 | |
| 12pm–1pm | Limited data | 2 | |
| 3pm–4pm | 68.6% | 0.0% | 52 |
| 4pm–5pm | Limited data | 6 | |
| 5pm–6pm | Limited data | 1 | |
| 8pm–9pm | Limited data | 17 | |
| 9pm–10pm | Limited data | 5 | |
| 10pm–11pm | 93.8% | 0.0% | 32 |
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 SAV
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) | Limited data | 2 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 5 | ||
| Summer peak (Jun 15 - Aug 15) | 73.8% | -19.0 pts | 1.8% | 110 |
| All other days | 92.9% | — | 0.6% | 169 |
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).