Route on-time record
IAD to LAX: most on-time flights and the best time to fly
Dulles (Washington Dulles International Airport) to Los Angeles (Los Angeles International Airport). 2,427 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 0.8% were cancelled. The most reliable flight number was United 1868 at 9:10 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
IAD → LAX
Dulles to Los Angeles: 2,427 nonstop flights a year
On time (12 months)
80%
Cancelled
0.8%
avg delay 14 min
Best time to leave
Noon to 3 PM
89% on time vs 72% 6 to 9 PM
Most reliable airline
United
81% chance on time
Lowest nonstop fare seen in the next two months: $160 (United 1689 on 2026-11-13). 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 1868
9:10 AM → 11:39 AM5h 29m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (11 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 (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 1868 fares Opens this date on Aviasales#2 · United 684
3:25 PM → 6:10 PM5h 45m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 95% of the time (64 flights, Jun 2025 to May 2026).
- Never cancelled in 64 scheduled flights.
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 64 flights
Find United 684 fares Opens this date on Aviasales#3 · United 1689
12:40 PM → 3:29 PM5h 49m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.5%
- Avg arrival delay
- 4 min
- Arrived on time 89% of the time (363 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Noon to 3 PM: 89% on time; 6 to 9 PM: 72%).
- Departs outside IAD's trouble window (1 PM to 7 PM, when 75% of its 63 ground stops and delay programs started).
Strong track record · 363 flights
Find United 1689 fares Opens this date on Aviasales#4 · United 325
7:00 AM → 9:26 AM5h 26m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 90% of the time (10 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 (10 flights), so its score leans on the airline's record at this hour.
Limited track record · 10 flights
Find United 325 fares Opens this date on Aviasales#5 · United 1087
6:43 PM → 9:36 PM5h 53m nonstop
Local times, typical schedule. Last flown 2026-05-20.
85%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (21 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 72% on time; Noon to 3 PM: 89%).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
Limited track record · 21 flights
Find United 1087 fares Opens this date on Aviasales#6 · United 2100
3:45 PM → 6:42 PM5h 57m nonstop
Local times, typical schedule. Last flown 2026-03-27.
85%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 18 min
- Arrived on time 95% of the time (20 flights, Jun 2025 to May 2026).
- Departs inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
- Short track record (20 flights), so its score leans on the airline's record at this hour.
Limited track record · 20 flights
Find United 2100 fares Opens this date on Aviasales#7 · United 1734
8:57 AM → 11:45 AM5h 48m nonstop
Local times, typical schedule. Last flown 2026-05-29.
83%
chance on time
- On time (history)
- 85%
- Cancelled
- 1.9%
- Avg arrival delay
- 14 min
- Arrived on time 85% of the time (155 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).
Moderate track record · 155 flights
Find United 1734 fares Opens this date on Aviasales#8 · United 1385
10:05 PM → 1:09 AM5h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.3%
- Avg arrival delay
- 9 min
- Arrived on time 82% of the time (336 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).
Strong track record · 336 flights
Find United 1385 fares Opens this date on Aviasales#9 · United 797
7:27 PM → 10:13 PM5h 46m nonstop
Local times, typical schedule. Last flown 2026-04-29. Same departure also flew as United 1027; its record covers all of them.
77%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 78% of the time (76 flights, Jun 2025 to May 2026).
- Never cancelled in 77 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 72% on time; Noon to 3 PM: 89%).
- 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 · 76 flights
Find United 797 fares Opens this date on Aviasales#10 · United 2294
8:53 PM → 11:44 PM5h 51m nonstop
Local times, typical schedule. Last flown 2026-05-20.
77%
chance on time
- On time (history)
- 80%
- Cancelled
- 1.1%
- Avg arrival delay
- 13 min
- Arrived on time 80% of the time (178 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 72% on time; Noon to 3 PM: 89%).
- 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 · 178 flights
Find United 2294 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines81%
2,293 flights · 82% on time as flown · 0.9% cancel
- American Airlines72%
54 flights · 69% on time as flown · 0.6% cancel
- Alaska Airlines67%
80 flights · 43% on time as flown · 0.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM87%
570 flights · avg delay 8 min
- Noon to 3 PM89%
365 flights · avg delay 4 min
- 3 to 6 PM73%
452 flights · avg delay 27 min
- 6 to 9 PM72%
641 flights · avg delay 18 min
- After 9 PM82%
337 flights · avg delay 9 min
Best day: Tuesday (85%). Worst: Saturday (79%).
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
- Airline (crew, maintenance, boarding)36%
- Late-arriving aircraft33%
- Air traffic control and airport volume19%
- Severe weather12%
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 LAX questions
- What time of day is best to fly IAD to LAX?
- Noon to 3 PM: 89% of flights arrived on time, against 72% for departures 6 to 9 PM.
- Which airline is most on time from IAD to LAX?
- United, with a season-adjusted 81% chance of operating and arriving on time over 2,293 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 LAX?
- July (70% on time); the best was November (88%), 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
- LAX to IAD (return)
- IAD to ATL 78%
- IAD to DEN 81%
- IAD to SFO 79%
- 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%
- IAD to TPA 79%
Live status: FAA delays and ground stops