Route on-time record
LAX to IAD: most on-time flights and the best time to fly
Los Angeles (Los Angeles International Airport) to Dulles (Washington Dulles International Airport). 2,429 nonstop flights in Jun 2025 to May 2026, 86% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was United 2081 at 6:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
LAX → IAD
Los Angeles to Dulles: 2,429 nonstop flights a year
On time (12 months)
86%
Cancelled
0.6%
avg delay 9 min
Best time to leave
3 to 6 PM
88% on time vs 83% before 9 AM
Most reliable airline
Alaska
86% chance on time
Lowest nonstop fare seen in the next two months: $178 (United 418 on 2026-11-09). 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 · United 2081
6:00 AM → 2:08 PM5h 08m nonstop
Local times, typical schedule. Last flown 2026-05-31.
94%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (24 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Before 9 AM: 83% on time; 3 to 6 PM: 88%).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 24 flights
Find United 2081 fares Opens this date on Aviasales#2 · United 2632
9:20 PM → 5:25 AM5h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
- On time (history)
- 93%
- Cancelled
- 1.4%
- Avg arrival delay
- 6 min
- Arrived on time 93% of the time (144 flights, Jun 2025 to May 2026).
- Departs inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 144 flights
Find United 2632 fares Opens this date on Aviasales#3 · United 418
11:20 PM → 7:25 AM5h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 94% of the time (98 flights, Jun 2025 to May 2026).
- Never cancelled in 98 scheduled flights.
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
Moderate track record · 98 flights
Find United 418 fares Opens this date on Aviasales#4 · United 1573
4:42 PM → 12:45 AM5h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 669; its record covers all of them.
88%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 88% of the time (239 flights, Jun 2025 to May 2026).
- Never cancelled in 240 scheduled flights.
- Leaves in this route's most on-time window (3 to 6 PM: 88% on time; Before 9 AM: 83%).
- Departs inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 239 flights
Find United 1573 fares Opens this date on Aviasales#5 · United 2667
10:15 AM → 6:20 PM5h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.3%
- Avg arrival delay
- 8 min
- Arrived on time 88% of the time (360 flights, Jun 2025 to May 2026).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 360 flights
Find United 2667 fares Opens this date on Aviasales#6 · United 1635
12:55 PM → 9:15 PM5h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.6%
- Avg arrival delay
- 11 min
- Arrived on time 87% of the time (342 flights, Jun 2025 to May 2026).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
Strong track record · 342 flights
Find United 1635 fares Opens this date on Aviasales#7 · United 2282
10:35 PM → 6:37 AM5h 02m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 87%
- Cancelled
- 1.1%
- Avg arrival delay
- 7 min
- Arrived on time 87% of the time (275 flights, Jun 2025 to May 2026).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
Strong track record · 275 flights
Find United 2282 fares Opens this date on Aviasales#8 · United 2268
8:30 AM → 4:29 PM4h 59m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
- On time (history)
- 80%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 80% of the time (109 flights, Jun 2025 to May 2026).
- Never cancelled in 109 scheduled flights.
- Leaves in this route's least on-time window (Before 9 AM: 83% on time; 3 to 6 PM: 88%).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
Moderate track record · 109 flights
Find United 2268 fares Opens this date on Aviasales#9 · United 1747
11:39 PM → 7:29 AM4h 50m nonstop
Local times, typical schedule. Last flown 2026-03-28.
74%
chance on time
- On time (history)
- 42%
- Cancelled
- 0.0%
- Avg arrival delay
- 24 min
- Arrived on time 42% of the time (24 flights, Jun 2025 to May 2026).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find United 1747 fares Opens this date on Aviasales#10 · American 3223
9:45 PM → 5:40 AM4h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
69%
chance on time
- On time (history)
- 73%
- Cancelled
- 0.0%
- Avg arrival delay
- 25 min
- Arrived on time 73% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Departs inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find American 3223 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Alaska Airlines86%
80 flights · 83% on time as flown · 0.4% cancel
- United Airlines86%
2,294 flights · 86% on time as flown · 0.7% cancel
- American Airlines74%
55 flights · 73% on time as flown · 0.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM83%
532 flights · avg delay 10 min
- 9 AM to noon87%
384 flights · avg delay 8 min
- Noon to 3 PM86%
436 flights · avg delay 11 min
- 3 to 6 PM88%
258 flights · avg delay 9 min
- After 9 PM86%
810 flights · avg delay 8 min
Best day: Tuesday (88%). Worst: Saturday (83%).
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
- Late-arriving aircraft42%
- Airline (crew, maintenance, boarding)36%
- Air traffic control and airport volume22%
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
LAX to IAD questions
- What time of day is best to fly LAX to IAD?
- 3 to 6 PM: 88% of flights arrived on time, against 83% for departures before 9 AM.
- Which airline is most on time from LAX to IAD?
- Alaska, with a season-adjusted 86% chance of operating and arriving on time over 80 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 LAX to IAD?
- July (75% on time); the best was April (93%), 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 LAX
- IAD to LAX (return)
- LAX to SFO 68%
- LAX to JFK 79%
- LAX to LAS 77%
- LAX to DEN 82%
- LAX to PHX 81%
- LAX to SEA 85%
- LAX to ORD 77%
- LAX to DFW 75%
- LAX to SMF 85%
- LAX to HNL 77%
- LAX to IAH 84%
- LAX to ATL 76%
Live status: FAA delays and ground stops