Route on-time record
LAS to SEA: most on-time flights and the best time to fly
Las Vegas (Harry Reid International Airport) to Seattle (Seattle–Tacoma International Airport). 5,699 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was Delta 2844 at 6:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
LAS → SEA
Las Vegas to Seattle: 5,699 nonstop flights a year
On time (12 months)
82%
Cancelled
1.0%
avg delay 12 min
Best time to leave
Before 9 AM
88% on time vs 68% after 9 PM
Most reliable airline
Delta
87% chance on time
Lowest nonstop fare seen in the next two months: $95 (Frontier 2407 on 2026-11-05). 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 2844
6:00 AM → 8:46 AM2h 46m nonstop
Local times, typical schedule. Last flown 2026-05-31.
95%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.3%
- Avg arrival delay
- 7 min
- Arrived on time 96% of the time (362 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 88% on time; After 9 PM: 68%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Strong track record · 362 flights
Find Delta 2844 fares Opens this date on Aviasales#2 · Alaska 701
6:00 AM → 8:51 AM2h 51m nonstop
Local times, typical schedule. Last flown 2026-05-31.
94%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.8%
- Avg arrival delay
- 7 min
- Arrived on time 95% of the time (248 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 88% on time; After 9 PM: 68%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Strong track record · 248 flights
Find Alaska 701 fares Opens this date on Aviasales#3 · Delta 2922
11:00 AM → 1:50 PM2h 54m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
- On time (history)
- 93%
- Cancelled
- 2.4%
- Avg arrival delay
- 5 min
- Arrived on time 93% of the time (206 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Strong track record · 206 flights
Find Delta 2922 fares Opens this date on Aviasales#4 · Alaska 273
11:59 AM → 2:53 PM2h 54m nonstop
Local times, typical schedule. Last flown 2026-03-17.
90%
chance on time
- On time (history)
- 100%
- Cancelled
- 3.4%
- Avg arrival delay
- 1 min
- Arrived on time 100% of the time (28 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (28 flights), so its score leans on the airline's record at this hour.
Limited track record · 28 flights
Find Alaska 273 fares Opens this date on Aviasales#5 · Delta 2905
1:55 PM → 5:00 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.5%
- Avg arrival delay
- 13 min
- Arrived on time 88% of the time (192 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- 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 · 192 flights
Find Delta 2905 fares Opens this date on Aviasales#6 · Alaska 629
11:46 AM → 2:37 PM2h 54m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.6%
- Avg arrival delay
- 12 min
- Arrived on time 88% of the time (340 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Strong track record · 340 flights
Find Alaska 629 fares Opens this date on Aviasales#7 · Alaska 735
10:00 AM → 12:53 PM2h 53m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
- On time (history)
- 88%
- Cancelled
- 1.4%
- Avg arrival delay
- 11 min
- Arrived on time 88% of the time (144 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- 57% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 144 flights
Find Alaska 735 fares Opens this date on Aviasales#8 · Frontier 4667
5:24 PM → 8:20 PM2h 56m nonstop
Local times, typical schedule. Last flown 2026-04-20.
83%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 94% of the time (31 flights, Jun 2025 to May 2026).
- Never cancelled in 31 scheduled flights.
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 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.
Limited track record · 31 flights
Find Frontier 4667 fares Opens this date on Aviasales#9 · Alaska 741
8:00 AM → 10:53 AM2h 53m nonstop
Local times, typical schedule. Last flown 2026-05-12.
82%
chance on time
- On time (history)
- 85%
- Cancelled
- 0.5%
- Avg arrival delay
- 14 min
- Arrived on time 85% of the time (191 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 88% on time; After 9 PM: 68%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Moderate track record · 191 flights
Find Alaska 741 fares Opens this date on Aviasales#10 · Delta 2870
4:24 PM → 7:20 PM2h 56m nonstop
Local times, typical schedule. Last flown 2026-05-06.
82%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.0%
- Avg arrival delay
- 15 min
- Arrived on time 83% of the time (24 flights, Jun 2025 to May 2026).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 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.
- 82% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 24 flights
Find Delta 2870 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines87%
1,735 flights · 88% on time as flown · 1.0% cancel
- Spirit Airlines85%
83 flights · 86% on time as flown · 0.7% cancel
- Alaska Airlines81%
2,660 flights · 82% on time as flown · 1.3% cancel
- Frontier Airlines79%
237 flights · 80% on time as flown · 1.2% cancel
- Southwest Airlines72%
977 flights · 72% on time as flown · 0.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM88%
1,318 flights · avg delay 10 min
- 9 AM to noon87%
1,250 flights · avg delay 9 min
- Noon to 3 PM81%
1,084 flights · avg delay 12 min
- 3 to 6 PM78%
1,004 flights · avg delay 14 min
- 6 to 9 PM75%
683 flights · avg delay 16 min
- After 9 PM68%
360 flights · avg delay 18 min
Best day: Wednesday (86%). Worst: Friday (74%).
Smarter routing
Nearby airports that run more on time
LAS → PAE 87% chance on time
Harry Reid International Airport to Seattle Paine Field International Airport · 445 flights a year · 32 mi from your airports · yours: 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
- Late-arriving aircraft47%
- Airline (crew, maintenance, boarding)34%
- Air traffic control and airport volume17%
- Severe weather3%
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
LAS to SEA questions
- What time of day is best to fly LAS to SEA?
- Before 9 AM: 88% of flights arrived on time, against 68% for departures after 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 LAS to SEA?
- Delta, with a season-adjusted 87% chance of operating and arriving on time over 1,735 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 LAS to SEA?
- June (73% on time); the best was February (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 LAS
- SEA to LAS (return)
- LAS to LAX 79%
- LAS to DEN 77%
- LAS to SAN 68%
- LAS to PHX 78%
- LAS to SFO 66%
- LAS to ORD 77%
- LAS to DFW 81%
- LAS to ATL 84%
- LAS to SNA 82%
- LAS to SMF 79%
- LAS to BUR 80%
- LAS to RNO 80%
Live status: FAA delays and ground stops