Route on-time record
LAX to SEA: most on-time flights and the best time to fly
Los Angeles (Los Angeles International Airport) to Seattle (Seattle–Tacoma International Airport). 7,405 nonstop flights in Jun 2025 to May 2026, 85% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was Delta 1714 at 9:56 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
LAX → SEA
Los Angeles to Seattle: 7,405 nonstop flights a year
On time (12 months)
85%
Cancelled
1.0%
avg delay 10 min
Best time to leave
Before 9 AM
89% on time vs 81% 6 to 9 PM
Most reliable airline
Delta
87% chance on time
Lowest nonstop fare seen in the next two months: $68 (Frontier 1177 on 2026-11-21). 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 · Delta 1714
9:56 AM → 12:49 PM2h 53m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.6%
- Avg arrival delay
- 5 min
- Arrived on time 93% of the time (347 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 · 347 flights
Find Delta 1714 fares Opens this date on Aviasales#2 · Alaska 1413
6:30 AM → 9:29 AM2h 59m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Alaska 383; its record covers all of them.
91%
chance on time
- On time (history)
- 95%
- Cancelled
- 1.7%
- Avg arrival delay
- 5 min
- Arrived on time 95% of the time (57 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 81%).
- 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 (57 flights), so its score leans on the airline's record at this hour.
Limited track record · 57 flights
Find Alaska 1413 fares Opens this date on Aviasales#3 · SkyWest 5873 · sold as United Express, Delta Connection, American Eagle or Alaska
8:30 AM → 11:37 AM3h 07m nonstop
Local times, typical schedule. Last flown 2026-05-20.
91%
chance on time
- On time (history)
- 96%
- Cancelled
- 1.3%
- Avg arrival delay
- 3 min
- Arrived on time 96% of the time (76 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 81%).
- 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 · 76 flights
Find 8:30 AM flight fares Opens this date on Aviasales#4 · SkyWest 5273 · sold as United Express, Delta Connection, American Eagle or Alaska
12:45 PM → 3:51 PM3h 06m nonstop
Local times, typical schedule. Last flown 2026-05-20.
91%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 96% of the time (53 flights, Jun 2025 to May 2026).
- Never cancelled in 53 scheduled flights.
- 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 (53 flights), so its score leans on the airline's record at this hour.
Limited track record · 53 flights
Find 12:45 PM flight fares Opens this date on Aviasales#5 · Delta 2980
7:35 AM → 10:26 AM2h 53m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 1.1%
- Avg arrival delay
- 11 min
- Arrived on time 91% of the time (360 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 89% on time; 6 to 9 PM: 81%).
- 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 · 360 flights
Find Delta 2980 fares Opens this date on Aviasales#6 · Alaska 84
7:40 PM → 10:42 PM3h 02m nonstop
Local times, typical schedule. Last flown 2026-04-21.
90%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 93% of the time (155 flights, Jun 2025 to May 2026).
- Never cancelled in 155 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 81% on time; Before 9 AM: 89%).
- 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 · 155 flights
Find Alaska 84 fares Opens this date on Aviasales#7 · Alaska 698
3:53 PM → 6:51 PM2h 57m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 92%
- Cancelled
- 1.2%
- Avg arrival delay
- 3 min
- Arrived on time 92% of the time (162 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 SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 162 flights
Find Alaska 698 fares Opens this date on Aviasales#8 · SkyWest 4955 · sold as United Express, Delta Connection, American Eagle or Alaska
8:00 PM → 10:58 PM2h 58m nonstop
Local times, typical schedule. Last flown 2026-05-20.
88%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 93% of the time (44 flights, Jun 2025 to May 2026).
- Never cancelled in 44 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 81% on time; Before 9 AM: 89%).
- Departs inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
Limited track record · 44 flights
Find 8:00 PM flight fares Opens this date on Aviasales#9 · Alaska 1317
9:00 AM → 12:01 PM3h 01m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 90%
- Cancelled
- 2.4%
- Avg arrival delay
- 4 min
- Arrived on time 90% of the time (83 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).
Moderate track record · 83 flights
Find Alaska 1317 fares Opens this date on Aviasales#10 · Delta 1045
11:50 AM → 2:41 PM2h 51m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.6%
- Avg arrival delay
- 8 min
- Arrived on time 88% of the time (321 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 · 321 flights
Find Delta 1045 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines87%
2,222 flights · 87% on time as flown · 0.7% cancel
- United Airlines84%
395 flights · 84% on time as flown · 0.6% cancel
- Alaska Airlines84%
3,280 flights · 85% on time as flown · 1.2% cancel
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)83%
1,246 flights · 84% on time as flown · 0.7% cancel
- Frontier Airlines78%
261 flights · 80% on time as flown · 2.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM89%
1,344 flights · avg delay 8 min
- 9 AM to noon87%
1,504 flights · avg delay 9 min
- Noon to 3 PM86%
1,105 flights · avg delay 9 min
- 3 to 6 PM85%
1,509 flights · avg delay 11 min
- 6 to 9 PM81%
1,694 flights · avg delay 13 min
- After 9 PM82%
249 flights · avg delay 10 min
Best day: Tuesday (89%). Worst: Sunday (81%).
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)51%
- Late-arriving aircraft32%
- Air traffic control and airport volume15%
- Severe weather1%
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 SEA questions
- What time of day is best to fly LAX to SEA?
- Before 9 AM: 89% of flights arrived on time, against 81% for departures 6 to 9 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 LAX to SEA?
- Delta, with a season-adjusted 87% chance of operating and arriving on time over 2,222 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 SEA?
- June (81% on time); the best was November (90%), 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
- SEA 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 ORD 77%
- LAX to DFW 75%
- LAX to SMF 85%
- LAX to HNL 77%
- LAX to IAH 84%
- LAX to ATL 76%
- LAX to EWR 79%
Live status: FAA delays and ground stops