LAS → SEA Flight Reliability

Right now

Origin · LASNo disruption reported

Aviation weather is not currently a factor.

Updated 07:56 UTC

Las Vegas airport profile →

Destination · SEANo disruption reported

Aviation weather is not currently a factor.

Updated 07:53 UTC

Seattle airport profile →

Route reliability

July 2023 – July 2026

Route Reliability Score

74/ 100Good

Better than 73% of comparable major US routes (4,598 compared)

Calculated from 19,214 flights. How this is calculated

On-time arrivals

80.2%

15,271 of 19,044

Cancellation rate

0.82%

157 cancelled

Median arrival delay

-7 min

Average 3.4 min

Severe delays

5.4%

60+ minutes late

Delay when late

60 min

Average, when 15+ min late

Flights analyzed

19,214

5 carriers

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

LAS → SEA spends 30.7 minutes on the ground on an 867-mile trip: 18.7 minutes from pushback to wheels-up at LAS and 12.0 minutes from touchdown to gate at SEA.

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

Why LAS → SEA flights are cancelled

July 2023 – July 2026

LAS → SEA cancelled 157 of 19,214 scheduled flights — about 1 in every 122. The reason filed most often was the airline, 74.5% of the cancellations coded on this route — about 1 in every 164 scheduled flights.

Share of cancellations

Airline74.5%

Weather20.4%

Air traffic5.1%

Security0.0%

Of 157 cancelled departures carrying a reason code.

What each reason means

The airline1 in 164

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

117 cancellations, 74.5% of the total.

Extreme weather1 in 600

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

32 cancellations, 20.4% of the total.

The air traffic system1 in 2,402

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

8 cancellations, 5.1% 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.

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

When it goes wrong

July 2023 – July 2026

One arrival in ten is worse than

35 min late

against a median of 7 min early

Arrived an hour or more late5.4%

Typical delay when late60 min

Cancelled0.82%

Landed somewhere else0.07%

Percentiles over 19,214 operations; cancelled and diverted flights are counted separately.

Will your connection be tight enough?

Layovers at SEA after arriving from LAS.

Connection buffer and chance of missing by layover length, LAS → SEA arrivals
Connection time	Chance of missing	Reads as
30 min	36%	Likely to miss
45 min	19%	High risk
60 min	12%	Some risk
90 min	5.3%	Some risk
120 min	3.1%	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 0.82% of the time and diverts 0.07% of the time, which a late arrival never shows up in.

Chance of missing is the share of 19,044 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 35 minutes late (90th-percentile gate arrival delay), over 19,214 operations.

Any other layover length: connection checker.

Best time to fly

LAS → SEA flights departing 5–9 AM arrived on time 88.9% of the time, against 68.9% for 9 PM–5 AM departures, a gap of 20.0 percentage points.

By day and hour

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

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 4.2 points.

On-time arrival rate for LAS to SEA 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 (208 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 LAS to SEA. A dash means fewer than 120 flights, which are not scored.
Hour	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
6 AM–7 AM	92.0% on time339 flights	96.0% on time279 flights	96.9% on time260 flights	96.7% on time341 flights	93.3% on time345 flights	93.6% on time285 flights	94.6% on time387 flights
7 AM–8 AM	85.6% on time245 flights	87.6% on time178 flights	89.8% on time183 flights	82.2% on time245 flights	79.7% on time237 flights	82.0% on time201 flights	85.0% on time227 flights
8 AM–9 AM	109 flights, too few to score	118 flights, too few to score	111 flights, too few to score	109 flights, too few to score	111 flights, too few to score	111 flights, too few to score	105 flights, too few to score
9 AM–10 AM	89.0% on time148 flights	82.9% on time148 flights	90.8% on time142 flights	87.0% on time131 flights	84.5% on time131 flights	112 flights, too few to score	84.6% on time120 flights
10 AM–11 AM	86.9% on time192 flights	91.4% on time199 flights	88.2% on time211 flights	93.2% on time190 flights	84.0% on time188 flights	84.4% on time181 flights	88.1% on time194 flights
11 AM–12 PM	78.4% on time233 flights	91.2% on time194 flights	92.1% on time193 flights	86.4% on time229 flights	86.9% on time226 flights	90.4% on time212 flights	87.9% on time219 flights
12 PM–1 PM	88 flights, too few to score	103 flights, too few to score	103 flights, too few to score	103 flights, too few to score	110 flights, too few to score	79.7% on time124 flights	103 flights, too few to score
1 PM–2 PM	81.6% on time186 flights	83.6% on time190 flights	86.3% on time183 flights	80.5% on time190 flights	70.7% on time186 flights	87.4% on time199 flights	72.9% on time170 flights
2 PM–3 PM	79.0% on time196 flights	82.5% on time167 flights	79.1% on time173 flights	66.0% on time192 flights	61.0% on time190 flights	83.2% on time179 flights	71.7% on time181 flights
3 PM–4 PM	74.3% on time231 flights	81.8% on time198 flights	82.7% on time202 flights	73.0% on time246 flights	69.5% on time236 flights	88.5% on time174 flights	69.3% on time217 flights
4 PM–5 PM	70.3% on time149 flights	79.5% on time123 flights	73.6% on time126 flights	62.8% on time139 flights	66.0% on time151 flights	97 flights, too few to score	68.1% on time145 flights
5 PM–6 PM	73.6% on time205 flights	78.5% on time158 flights	85.9% on time158 flights	60.6% on time200 flights	64.4% on time197 flights	81.9% on time174 flights	67.8% on time227 flights
6 PM–7 PM	72 flights, too few to score	83 flights, too few to score	65 flights, too few to score	58 flights, too few to score	72 flights, too few to score	56 flights, too few to score	77 flights, too few to score
7 PM–8 PM	64.7% on time218 flights	84.0% on time176 flights	80.2% on time187 flights	68.4% on time230 flights	56.2% on time202 flights	78.3% on time130 flights	62.7% on time204 flights
8 PM–9 PM	70.6% on time120 flights	84.5% on time129 flights	76.7% on time134 flights	106 flights, too few to score	118 flights, too few to score	57 flights, too few to score	97 flights, too few to score
9 PM–10 PM	73.1% on time176 flights	101 flights, too few to score	102 flights, too few to score	67.2% on time179 flights	68.9% on time181 flights	114 flights, too few to score	64.0% on time174 flights

By departure window

5–9 AM88.9%

9 AM–12 PM87.6%

12–3 PM78.8%

3–6 PM73.5%

6–9 PM70.8%

9 PM–5 AM68.9%

By departure hour

12 AM

3 AM

6 AM

9 AM

12 PM

3 PM

6 PM

9 PM

Why LAS → SEA runs late

July 2023 – July 2026

Late-arriving aircraft44.3%

the inbound aircraft was late, so this flight started late

The airline34.3%

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

Air traffic control18.1%

airspace and airport capacity, including weather-driven flow control

Weather3.1%

weather severe enough to stop this flight specifically

Security0.2%

screening or terminal security incidents

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

Late-arriving aircraft is the largest cause on LAS → SEA, at 44.3%: flights here mostly leave late because the plane came in late, and the day shows it: 5–9 AM departures arrived on time 88.9% of the time and 9 PM–5 AM departures 68.9%.

How this route holds up in bad weather

July 2023 – July 2026

Bad weather raises cancellations by a similar amount at both ends of LAS to SEA: 2.4 times the normal rate at LAS and 1.9 times at SEA. Cancelled in bad weather against normal hours: LAS 2.0% against 0.8%, SEA 1.5% 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 LAS and SEA in hours of bad weather and in normal hours
Departures from	LAS	SEA
Cancelled in bad weather	2.0%	1.5%
Cancelled in normal hours	0.8%	0.8%
Arrived on time, bad weather	58.5%	75.4%
Arrived on time, normal hours	78.5%	79.3%
Departures in bad weather	14,522	43,416

Of the carriers on this route, Delta Air Lines (1.1% cancelled against 2.0% for the other carriers at LAS) cancelled the fewest departures from LAS in bad weather and Frontier Airlines (4.0% cancelled against 1.8% for the other carriers at LAS) the most. One more carrier flies this route but has too few bad-weather departures from LAS to compare.

This route’s airlines in bad weather at LAS

All departures from LAS

Cancellation rates in bad weather at LAS for the airlines that fly LAS to SEA, against the other carriers at LAS in the same months
Airline	Bad-weather departures	Cancelled	Other carriers
Delta Air Lines	1,240	1.1%below the others	2.0%
Southwest Airlines	6,925	2.0%about level	2.1%
Spirit Airlines	1,398	3.8%above the others	2.3%
Frontier Airlines	943	4.0%above the others	1.8%

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

Weather source and limits. In full: LAS (airlines), SEA, 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	8,339	79.4%	1.18%	-5 min	5.7%
Delta Air Lines	5,377	86.9%	0.48%	-13 min	4.2%
Southwest Airlines	3,046	70.6%	0.33%	0 min	5.7%
Spirit Airlines	1,496	80.5%	0.74%	-8 min	6.3%
Frontier Airlines	884	80.0%	1.36%	-9 min	6.0%

Alaska Airlines flew 43.6% of the 19,142 flights listed. Frontier Airlines cancelled 1.36% of its flights here against 0.33% for Southwest Airlines.

Delta Air Lines arrived on time 16.3 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
DL2844 Delta Air Lines	6:00 AM	1,036	95.4%
AS629 Alaska Airlines	7:00 AM	988	85.1%

Weekly and seasonal patterns

By day of week

Mon79.4%

Tue85.4%

Wed85.6%

Thu77.9%

Fri74.2%

Sat83.9%

Sun76.8%

Wednesday is historically the most reliable day and Friday the least, a gap of 11.4 percentage points.

By month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

June is historically the weakest month and February the strongest, a spread of 12.5 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 82.4% against 80.2% in the 12 months before — improving by 2.2 percentage points.

Data and methodology

Calculated by FlyerIntel from 19,214 LAS → SEA 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

LAS airport SEA airport Return direction SEA → LAS

LAS→SEA

Right now

Route reliability

Why LAS → SEA 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 LAS → SEA 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 LAS

Airlines on this route

Flights on this route

Weekly and seasonal patterns

By day of week

By month

Reliability over time

Data and methodology