Route on-time record

SEA to LAS: most on-time flights and the best time to fly

Seattle (Seattle–Tacoma International Airport) to Las Vegas (Harry Reid International Airport). 5,703 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was Delta 2922 at 7:15 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

SEA → LAS

Seattle to Las Vegas: 5,703 nonstop flights a year

On time (12 months)

77%

Cancelled

0.9%

avg delay 14 min

Best time to leave

Before 9 AM

91% on time vs 61% after 9 PM

Most reliable airline

Delta

82% chance on time

Check SEA to LAS fares

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 2922
7:15 AM → 9:48 AM2h 37m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
On time (history)
91%
Cancelled
0.8%
Avg arrival delay
6 min
- Arrived on time 91% of the time (362 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 61%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Strong track record · 362 flights
Find Delta 2922 fares Opens this date on Aviasales
#2 · Alaska 704
8:25 AM → 12:14 PM2h 43m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
On time (history)
93%
Cancelled
2.8%
Avg arrival delay
5 min
- Arrived on time 93% of the time (174 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 61%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Moderate track record · 174 flights
Find Alaska 704 fares Opens this date on Aviasales
#3 · Alaska 1481
7:15 AM → 9:53 AM2h 38m nonstop
Local times, typical schedule. Last flown 2026-05-11.
88%
chance on time
On time (history)
92%
Cancelled
0.0%
Avg arrival delay
5 min
- Arrived on time 92% of the time (12 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 61%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Short track record (12 flights), so its score leans on the airline's record at this hour.
Limited track record · 12 flights
Find Alaska 1481 fares Opens this date on Aviasales
#4 · Delta 2905
10:15 AM → 1:14 PM2h 32m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
On time (history)
86%
Cancelled
0.5%
Avg arrival delay
9 min
- Arrived on time 86% of the time (361 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Strong track record · 361 flights
Find Delta 2905 fares Opens this date on Aviasales
#5 · Southwest 431
6:15 AM → 8:40 AM2h 25m nonstop
Local times, typical schedule. Last flown 2026-05-29. Same departure also flew as Southwest 3883; its record covers all of them.
85%
chance on time
On time (history)
93%
Cancelled
2.3%
Avg arrival delay
8 min
- Arrived on time 93% of the time (42 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 61%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Short track record (42 flights), so its score leans on the airline's record at this hour.
Limited track record · 42 flights
Find Southwest 431 fares Opens this date on Aviasales
#6 · Southwest 1950
7:00 AM → 9:25 AM2h 25m nonstop
Local times, typical schedule. Last flown 2026-04-01.
85%
chance on time
On time (history)
88%
Cancelled
0.0%
Avg arrival delay
4 min
- Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 61%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 1950 fares Opens this date on Aviasales
#7 · Alaska 610
10:31 AM → 1:10 PM2h 39m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
On time (history)
89%
Cancelled
0.0%
Avg arrival delay
7 min
- Arrived on time 89% of the time (19 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (19 flights), so its score leans on the airline's record at this hour.
Limited track record · 19 flights
Find Alaska 610 fares Opens this date on Aviasales
#8 · Delta 2949
8:20 PM → 10:53 PM2h 33m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
On time (history)
81%
Cancelled
0.3%
Avg arrival delay
11 min
- Arrived on time 81% of the time (357 flights, Jun 2025 to May 2026).
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 357 flights
Find Delta 2949 fares Opens this date on Aviasales
#9 · Delta 2880
12:15 PM → 2:48 PM2h 33m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
On time (history)
81%
Cancelled
2.2%
Avg arrival delay
11 min
- Arrived on time 81% of the time (349 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Strong track record · 349 flights
Find Delta 2880 fares Opens this date on Aviasales
#10 · Alaska 658
12:00 PM → 2:40 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
On time (history)
79%
Cancelled
0.8%
Avg arrival delay
9 min
- Arrived on time 79% of the time (252 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Strong track record · 252 flights
Find Alaska 658 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

Delta Air Lines82%
1,735 flights · 83% on time as flown · 1.0% cancel
Alaska Airlines75%
2,661 flights · 76% on time as flown · 1.0% cancel
Spirit Airlines75%
84 flights · 69% on time as flown · 1.0% cancel
Southwest Airlines69%
977 flights · 68% on time as flown · 0.7% cancel
Frontier Airlines68%
237 flights · 68% on time as flown · 1.4% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

Before 9 AM91%
1,162 flights · avg delay 6 min
9 AM to noon80%
945 flights · avg delay 11 min
Noon to 3 PM76%
1,088 flights · avg delay 13 min
3 to 6 PM68%
1,285 flights · avg delay 18 min
6 to 9 PM72%
1,014 flights · avg delay 18 min
After 9 PM61%
209 flights · avg delay 18 min

Best day: Tuesday (83%). Worst: Thursday (73%).

Smarter routing

Nearby airports that run more on time

PAE → LAS 86% chance on time
Seattle Paine Field International Airport to Harry Reid International Airport · 447 flights a year · 32 mi from your airports · yours: 76%
Rank flights Fares

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)40%
Late-arriving aircraft34%
Air traffic control and airport volume24%
Severe weather2%

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

SEA to LAS questions

What time of day is best to fly SEA to LAS?: Before 9 AM: 91% of flights arrived on time, against 61% 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 SEA to LAS?: Delta, with a season-adjusted 82% 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 SEA to LAS?: July (71% on time); the best was November (83%), 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 SEA

Live status: FAA delays and ground stops

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Ask ATIS