Route on-time record
IAD to LGA: most on-time flights and the best time to fly
Dulles (Washington Dulles International Airport) to New York (LaGuardia Airport). 979 nonstop flights in Jun 2025 to May 2026, 74% arrived within 15 minutes and 6.9% were cancelled. The most reliable flight number was Republic 3695 at 8:20 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAD → LGA
Dulles to New York: 979 nonstop flights a year
On time (12 months)
74%
Cancelled
6.9%
avg delay 21 min
Best time to leave
Before 9 AM
86% on time vs 69% noon to 3 PM
Most reliable airline
Republic
68% chance on time
Lowest nonstop fare seen in the next two months: $122 (United 4026 on 2026-10-21). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Republic 3695 · sold as American Eagle, Delta Connection or United Express
8:20 AM → 9:46 AM1h 26m nonstop
Local times, typical schedule. Last flown 2026-05-18. Same departure also flew as Republic 3430; its record covers all of them.
79%
chance on time
- On time (history)
- 87%
- Cancelled
- 4.6%
- Avg arrival delay
- 8 min
- Arrived on time 87% of the time (104 flights, Jun 2025 to May 2026).
- Cancelled 4.6% of the time (5 of 109).
- Leaves in this route's most on-time window (Before 9 AM: 86% on time; Noon to 3 PM: 69%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Moderate track record · 104 flights
Find 8:20 AM flight fares Opens this date on Aviasales#2 · Republic 3413 · sold as American Eagle, Delta Connection or United Express
10:08 PM → 11:30 PM1h 22m nonstop
Local times, typical schedule. Last flown 2026-05-31.
72%
chance on time
- On time (history)
- 77%
- Cancelled
- 4.3%
- Avg arrival delay
- 21 min
- Arrived on time 77% of the time (199 flights, Jun 2025 to May 2026).
- Cancelled 4.3% of the time (9 of 208).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Moderate track record · 199 flights
Find 10:08 PM flight fares Opens this date on Aviasales#3 · Republic 3436 · sold as American Eagle, Delta Connection or United Express
10:22 PM → 11:44 PM1h 22m nonstop
Local times, typical schedule. Last flown 2026-03-28.
71%
chance on time
- On time (history)
- 78%
- Cancelled
- 20.8%
- Avg arrival delay
- 21 min
- Arrived on time 78% of the time (18 flights, Jun 2025 to May 2026).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
- Short track record (18 flights), so its score leans on the airline's record at this hour.
Limited track record · 18 flights
Find 10:22 PM flight fares Opens this date on Aviasales#4 · Republic 3698 · sold as American Eagle, Delta Connection or United Express
12:40 PM → 2:18 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
67%
chance on time
- On time (history)
- 73%
- Cancelled
- 4.3%
- Avg arrival delay
- 21 min
- Arrived on time 73% of the time (110 flights, Jun 2025 to May 2026).
- Cancelled 4.3% of the time (5 of 115).
- Leaves in this route's least on-time window (Noon to 3 PM: 69% on time; Before 9 AM: 86%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Moderate track record · 110 flights
Find 12:40 PM flight fares Opens this date on Aviasales#5 · Republic 3497 · sold as American Eagle, Delta Connection or United Express
5:10 PM → 6:43 PM1h 33m nonstop
Local times, typical schedule. Last flown 2026-05-18. Same departure also flew as Republic 3689; its record covers all of them.
64%
chance on time
- On time (history)
- 70%
- Cancelled
- 9.9%
- Avg arrival delay
- 28 min
- Arrived on time 70% of the time (209 flights, Jun 2025 to May 2026).
- Cancelled 9.9% of the time (23 of 232).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 209 flights
Find 5:10 PM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Republic Airways (sold as American Eagle, Delta Connection or United Express)68%
976 flights · 74% on time as flown · 7.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM86%
127 flights · avg delay 10 min
- Noon to 3 PM69%
334 flights · avg delay 21 min
- 3 to 6 PM71%
254 flights · avg delay 28 min
- After 9 PM77%
261 flights · avg delay 20 min
Best day: Saturday (87%). Worst: Friday (72%).
Smarter routing
Nearby airports that run more on time
DCA → EWR 87% chance on time
Ronald Reagan Washington National Airport to Newark Liberty International Airport · 333 flights a year · 40 mi from your airports · yours: 69%
BWI → ISP 75% chance on time
Baltimore/Washington International Thurgood Marshall Airport to Long Island MacArthur Airport · 1,203 flights a year · 85 mi from your airports · yours: 69%
DCA → JFK 73% chance on time
Ronald Reagan Washington National Airport to John F. Kennedy International Airport · 2,499 flights a year · 34 mi from your airports · yours: 69%
IAD → EWR 72% chance on time
Washington Dulles International Airport to Newark Liberty International Airport · 1,473 flights a year · 17 mi from your airports · yours: 69%
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Air traffic control and airport volume53%
- Late-arriving aircraft26%
- Airline (crew, maintenance, boarding)16%
- Severe weather5%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
IAD to LGA questions
- What time of day is best to fly IAD to LGA?
- Before 9 AM: 86% of flights arrived on time, against 69% for departures noon to 3 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from IAD to LGA?
- Republic, with a season-adjusted 68% chance of operating and arriving on time over 976 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on IAD to LGA?
- July (65% on time); the best was January (85%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from IAD
- LGA to IAD (return)
- IAD to ATL 78%
- IAD to DEN 81%
- IAD to SFO 79%
- IAD to LAX 80%
- IAD to MCO 81%
- IAD to CLT 83%
- IAD to ORD 75%
- IAD to SEA 76%
- IAD to DFW 77%
- IAD to IAH 83%
- IAD to BOS 75%
- IAD to EWR 73%
Live status: FAA delays and ground stops