SEA → LAS Flight Reliability

Right now

Origin · SEANo disruption reported

Aviation weather is not currently a factor.

Updated 09:53 UTC

Seattle airport profile →

Destination · LASNo disruption reported

Aviation weather is not currently a factor.

Updated 09:56 UTC

Las Vegas airport profile →

Route reliability

July 2023 – July 2026

Route Reliability Score

71/ 100Good

Better than 63% of comparable major US routes (4,598 compared)

Calculated from 19,230 flights. How this is calculated

On-time arrivals

77.6%

14,792 of 19,065

Cancellation rate

0.77%

149 cancelled

Median arrival delay

-3 min

Average 6.0 min

Severe delays

5.7%

60+ minutes late

Delay when late

53 min

Average, when 15+ min late

Flights analyzed

19,230

5 carriers

SEA → LAS arrives on time 77.6% of the time; the return trip, LAS → SEA, arrives on time 80.2% of the time, a 2.6-point gap between the two directions of the same city pair.

SEA → LAS spends 30.5 minutes on the ground on an 867-mile trip: 21.1 minutes from pushback to wheels-up at SEA and 9.4 minutes from touchdown to gate at LAS.

Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026

Why SEA → LAS flights are cancelled

July 2023 – July 2026

SEA → LAS cancelled 149 of 19,230 scheduled flights — about 1 in every 129. The reason filed most often was the airline, 73.8% of the cancellations coded on this route — about 1 in every 175 scheduled flights.

Share of cancellations

Airline73.8%

Weather19.5%

Air traffic6.7%

Security0.0%

Of 149 cancelled departures carrying a reason code.

What each reason means

The airline1 in 175

Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.

110 cancellations, 73.8% of the total.

Extreme weather1 in 663

Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.

29 cancellations, 19.5% of the total.

The air traffic system1 in 1,923

Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.

10 cancellations, 6.7% of the total.

Security—

A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.

0 cancellations, 0.0% of the total.

Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.

149 coded cancellations were recorded on SEA → LAS; the section appears from 50.

When it goes wrong

July 2023 – July 2026

One arrival in ten is worse than

39 min late

against a median of 3 min early

Arrived an hour or more late5.7%

Typical delay when late53 min

Cancelled0.77%

Landed somewhere else0.08%

Percentiles over 19,230 operations; cancelled and diverted flights are counted separately.

Will your connection be tight enough?

Layovers at LAS after arriving from SEA.

Connection buffer and chance of missing by layover length, SEA → LAS arrivals
Connection time	Chance of missing	Reads as
30 min	41%	Likely to miss
45 min	22%	High risk
60 min	13%	Some risk
90 min	5.6%	Some risk
120 min	2.8%	Low risk

This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 0.77% of the time and diverts 0.08% of the time, which a late arrival never shows up in.

Chance of missing is the share of 19,065 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.

The worst tenth of arrivals on this route land at least 39 minutes late (90th-percentile gate arrival delay), over 19,230 operations.

Any other layover length: connection checker.

Best time to fly

SEA → LAS flights departing 5–9 AM arrived on time 90.1% of the time, against 66.8% for 9 PM–5 AM departures, a gap of 23.3 percentage points.

By day and hour

On-time arrival rate for each weekday and scheduled departure hour, in local time at the departure airport (SEA).

Hour of departure matters more than day of the week: hourly averages sit a typical 8.3 points from the route-wide rate, weekday averages 4.0 points.

On-time arrival rate for SEA to LAS by weekday and scheduled departure hour, local time. Each button reads out one slot.
Hour	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
6 AM–7 AM
7 AM–8 AM
8 AM–9 AM
9 AM–10 AM
10 AM–11 AM
11 AM–12 PM
12 PM–1 PM
1 PM–2 PM
2 PM–3 PM
3 PM–4 PM
4 PM–5 PM
5 PM–6 PM
6 PM–7 PM
7 PM–8 PM
8 PM–9 PM
9 PM–10 PM

On-time rate, % · stronger color, fewer on time

50–59
60–69
70–79
80–89
90–99

Fewer than 120 flights, not scored

Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · On time is arrival within 15 minutes of schedule. Cells round to whole percentages; the table shows one decimal.

No slot is named best or worst: too few reach 500 flights. Departures before 6 AM and after 10 PM (394 flights) are not drawn: no slot in those hours has enough flights to score.

View as tableHide table

On-time arrival rate (%) with flights beneath, by scheduled departure hour and weekday for SEA to LAS. A dash means fewer than 120 flights, which are not scored.
Hour	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
6 AM–7 AM	90.6% on time195 flights	94.0% on time169 flights	93.5% on time169 flights	95.9% on time198 flights	95.5% on time202 flights	93.9% on time168 flights	91.8% on time211 flights
7 AM–8 AM	86.7% on time258 flights	90.4% on time197 flights	85.6% on time197 flights	86.8% on time259 flights	89.7% on time244 flights	87.0% on time173 flights	90.0% on time233 flights
8 AM–9 AM	89 flights, too few to score	90.9% on time122 flights	85.5% on time125 flights	90 flights, too few to score	91 flights, too few to score	108 flights, too few to score	87 flights, too few to score
9 AM–10 AM	118 flights, too few to score	87.3% on time142 flights	87.3% on time134 flights	119 flights, too few to score	119 flights, too few to score	99 flights, too few to score	116 flights, too few to score
10 AM–11 AM	79.8% on time258 flights	84.3% on time249 flights	82.7% on time243 flights	76.4% on time262 flights	82.2% on time258 flights	82.9% on time253 flights	83.8% on time272 flights
11 AM–12 PM	75.3% on time147 flights	75.2% on time129 flights	78.0% on time123 flights	72.3% on time159 flights	69.8% on time139 flights	82 flights, too few to score	77.3% on time132 flights
12 PM–1 PM	74.2% on time280 flights	85.3% on time236 flights	82.2% on time237 flights	73.2% on time267 flights	71.8% on time272 flights	83.0% on time232 flights	80.9% on time253 flights
1 PM–2 PM	111 flights, too few to score	104 flights, too few to score	108 flights, too few to score	111 flights, too few to score	116 flights, too few to score	70.6% on time155 flights	70.5% on time140 flights
2 PM–3 PM	119 flights, too few to score	84.3% on time121 flights	81.7% on time127 flights	97 flights, too few to score	108 flights, too few to score	80.8% on time126 flights	72.6% on time125 flights
3 PM–4 PM	64.6% on time211 flights	81.5% on time165 flights	82.9% on time160 flights	64.7% on time208 flights	59.4% on time212 flights	72.7% on time135 flights	66.5% on time205 flights
4 PM–5 PM	71.6% on time183 flights	81.4% on time220 flights	79.8% on time229 flights	70.9% on time207 flights	66.0% on time194 flights	79.5% on time133 flights	79.9% on time185 flights
5 PM–6 PM	59.5% on time189 flights	78.4% on time195 flights	75.5% on time188 flights	49.7% on time174 flights	54.4% on time181 flights	81.6% on time196 flights	56.0% on time150 flights
6 PM–7 PM	66.3% on time172 flights	118 flights, too few to score	77.2% on time123 flights	60.0% on time178 flights	55.3% on time189 flights	74.7% on time182 flights	67.5% on time167 flights
7 PM–8 PM	75.4% on time193 flights	80.5% on time159 flights	81.5% on time173 flights	67.2% on time191 flights	71.6% on time192 flights	118 flights, too few to score	72.0% on time201 flights
8 PM–9 PM	75.6% on time168 flights	80.8% on time121 flights	78.9% on time128 flights	71.8% on time185 flights	76.5% on time165 flights	114 flights, too few to score	71.4% on time193 flights
9 PM–10 PM	71.4% on time178 flights	73 flights, too few to score	62 flights, too few to score	55.0% on time151 flights	64.6% on time164 flights	86 flights, too few to score	63.4% on time189 flights

By departure window

5–9 AM90.1%

9 AM–12 PM81.6%

12–3 PM75.8%

3–6 PM70.3%

6–9 PM72.5%

9 PM–5 AM66.8%

By departure hour

12 AM

3 AM

6 AM

9 AM

12 PM

3 PM

6 PM

9 PM

Why SEA → LAS runs late

July 2023 – July 2026

The airline35.2%

crew, maintenance, boarding and fueling, all within the carrier’s control

Late-arriving aircraft33.1%

the inbound aircraft was late, so this flight started late

Air traffic control27.7%

airspace and airport capacity, including weather-driven flow control

Weather3.6%

weather severe enough to stop this flight specifically

Security0.4%

screening or terminal security incidents

Share of the delay minutes US DOT attributed to each cause for SEA → LAS. Only delays of 15 minutes or more are attributed.

How this route holds up in bad weather

July 2023 – July 2026

Bad weather raises cancellations by a similar amount at both ends of SEA to LAS: 1.9 times the normal rate at SEA and 2.4 times at LAS. Cancelled in bad weather against normal hours: SEA 1.5% against 0.8%, LAS 2.0% against 0.8%. Flights that did leave LAS in bad weather arrived on time 58.5% of the time, against 78.5% in normal hours.

Bad weather and normal hours at the airports

Scheduled departures, July 2023 – July 2026

Departures from SEA and LAS in hours of bad weather and in normal hours
Departures from	SEA	LAS
Cancelled in bad weather	1.5%	2.0%
Cancelled in normal hours	0.8%	0.8%
Arrived on time, bad weather	75.4%	58.5%
Arrived on time, normal hours	79.3%	78.5%
Departures in bad weather	43,416	14,522

Of the carriers on this route, Southwest Airlines (0.4% cancelled against 1.5% for the other carriers at SEA) cancelled the fewest departures from SEA in bad weather and Alaska Airlines (1.8% cancelled against 1.2% for the other carriers at SEA) the most. 2 more carriers fly this route but has too few bad-weather departures from SEA to compare.

This route’s airlines in bad weather at SEA

All departures from SEA

Cancellation rates in bad weather at SEA for the airlines that fly SEA to LAS, against the other carriers at SEA in the same months
Airline	Bad-weather departures	Cancelled	Other carriers
Southwest Airlines	2,229	0.4%below the others	1.5%
Delta Air Lines	9,020	1.1%below the others	1.6%
Alaska Airlines	20,261	1.8%above the others	1.2%

These are airport figures, not route figures: every scheduled departure from SEA and LAS, to any destination, in hours the weather report called bad. The airline rows count each carrier’s departures from SEA on every route.

Weather source and limits. In full: SEA (airlines), LAS, What Weather Costs Each Airport, Who Cancels More When the Weather Turns, Airports That Change Places When Weather Turns.

Airlines on this route

Carriers with at least 200 flights, by the airline that operated each one.

Airlines on this route
Carrier	Flights	On time	Cancelled	Median delay	Severe
Alaska Airlines	8,351	75.5%	0.99%	-1 min	5.7%
Delta Air Lines	5,377	84.8%	0.48%	-7 min	4.2%
Southwest Airlines	3,049	72.9%	0.36%	-1 min	5.9%
Spirit Airlines	1,495	75.1%	0.87%	-5 min	8.4%
Frontier Airlines	884	73.0%	1.81%	-5 min	10.5%

Alaska Airlines flew 43.6% of the 19,156 flights listed. Frontier Airlines cancelled 1.81% of its flights here against 0.36% for Southwest Airlines.

Delta Air Lines arrived on time 11.9 percentage points more often than Southwest Airlines on this route.

Flights on this route

Flight numbers with at least 600 operations here and still on the schedule.

Flights on this route
Flight	Scheduled	Operations	On time
AS738 Alaska Airlines	10:40 AM	1,047	77.5%
AS612 Alaska Airlines	8:05 AM	872	85.0%
DL2922 Delta Air Lines	7:20 AM	785	90.8%
DL2880 Delta Air Lines	12:00 PM	773	83.6%
DL2905 Delta Air Lines	10:05 AM	742	87.4%
DL2949 Delta Air Lines	7:59 PM	739	81.0%

DL2922 (7:20 AM) arrived on time 90.8% of the time, 13.3 points more often than AS738 (10:40 AM) at 77.5%.

Weekly and seasonal patterns

By day of week

Mon75.5%

Tue83.3%

Wed81.9%

Thu72.6%

Fri73.3%

Sat81.5%

Sun76.8%

Tuesday is historically the most reliable day and Thursday the least, a gap of 10.7 percentage points.

By month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

August is historically the weakest month and November the strongest, a spread of 11.6 percentage points.

Reliability over time

July 2023 – July 2026

24

25

26

Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 78.1% against 77.5% in the 12 months before — broadly unchanged.

Data and methodology

Calculated by FlyerIntel from 19,230 SEA → LAS flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.

Full methodology · Data sources · Report a problem

Analysis last recomputed September 26, 2026

SEA airport LAS airport Return direction LAS → SEA

SEA→LAS

Right now

Route reliability

Why SEA → LAS flights are cancelled

Share of cancellations

What each reason means

When it goes wrong

Will your connection be tight enough?

Best time to fly

By day and hour

By departure window

By departure hour

Why SEA → LAS runs late

How this route holds up in bad weather

Bad weather and normal hours at the airports

This route’s airlines in bad weather at SEA

Airlines on this route

Flights on this route

Weekly and seasonal patterns

By day of week

By month

Reliability over time

Data and methodology