Route · LAX → SEA · 2020–2025 BTS data
Los Angeles to Seattle
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), LAX to SEA (Los Angeles to Seattle) ranks #30 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 86.2%
- On-time
- +7.2 pts
- vs US avg
- 63 min
- Delay when late
- 41,819
- Flights
- #30 of 4927
- Corpus placement
Cancelled
1.0%
Best Month
Sep 2025 93%
Worst Month
Jun 2025 77%
Distance
954 mi
Carriers
43
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 629 | 111 | 9 | 4 | DL,F9,AS,UA,OO |
| Nov 2025 | 604 | 56 | 7 | 1 | OO,UA,DL,F9,AS |
| Oct 2025 | 612 | 69 | 6 | 1 | AS,OO,UA,DL,F9 |
| Sep 2025 | 606 | 45 | 3 | 0 | UA,OO,DL,F9,AA,AS |
| Aug 2025 | 633 | 120 | 4 | 0 | OO,F9,UA,AS,DL |
| Jul 2025 | 642 | 123 | 10 | 1 | AS,OO,UA,DL,F9 |
| Jun 2025 | 632 | 143 | 6 | 0 | AS,OO,UA,DL,F9 |
| May 2025 | 653 | 107 | 5 | 0 | AS,NK,OO,UA,DL,F9 |
| Apr 2025 | 592 | 71 | 1 | 0 | DL,F9,NK,OO,UA,AS |
| Mar 2025 | 612 | 97 | 8 | 0 | AS,OO,UA,NK,DL,F9 |
| Feb 2025 | 555 | 75 | 10 | 0 | AS,DL,OO,UA,F9,NK |
| Jan 2025 | 626 | 84 | 2 | 0 | AS,DL,OO,UA,F9,NK |
| Dec 2024 | 639 | 95 | 4 | 0 | AS,DL,F9,NK,OO,UA |
| Nov 2024 | 588 | 63 | 1 | 2 | OO,UA,NK,AS,DL |
| Oct 2024 | 639 | 63 | 4 | 0 | UA,AS,OO,DL,NK |
| Sep 2024 | 648 | 88 | 2 | 0 | OO,UA,AS,DL,NK |
| Aug 2024 | 695 | 125 | 5 | 2 | AS,DL,NK,OO,UA |
| Jul 2024 | 695 | 154 | 9 | 0 | AS,DL,NK,OO,UA |
| Jun 2024 | 644 | 115 | 3 | 0 | AS,DL,OO,UA |
| May 2024 | 628 | 109 | 2 | 1 | AS,DL,OO,UA |
| Apr 2024 | 599 | 85 | 0 | 0 | AS,DL,OO,UA |
| Mar 2024 | 572 | 109 | 3 | 0 | AS,DL,OO,UA |
| Feb 2024 | 507 | 60 | 0 | 0 | AS,DL,OO,UA |
| Jan 2024 | 528 | 80 | 45 | 0 | AS,DL,OO,UA |
LAX–SEA seasonal on-time pattern
Best: November (89.9%) · weakest: June (81.9%)
Strongest calendar month
November
89.9% on-time · ~578 flights/mo
Busiest calendar month
August
~651 flights/mo avg
Weakest calendar month
June
81.9% on-time · ~561 flights/mo
Cancellation Rate
1.0%
149 of 14,778 flights
Diversion Rate
0.1%
12 of 14,778 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
LAX - Los Angeles
Full on-time, delay-cause, and seasonal performance for Los Angeles, CA.
LAX on-time profileSEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
SEA on-time profileCompare the two airports
See LAX and SEA side by side on delays, cancellations, and reliability.
Compare LAX vs SEAOrigin-hub reliability standing
Among LAX's stronger departures
LAX → SEA posts a 86.2% on-time rate, landing in the ≥85% band with 40 of 80 BTS-tracked routes leaving Los Angeles. The same hub also shows 39 mid-band and 1 challenged departures · fleet-wide on-time rank #849 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to LAX–SEA.
Routes with a similar on-time rate
What the Data Says About LAX to SEA
Los Angeles to Seattle (LAX to SEA) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.2% on-time rate across 41,819 flights, with delays that do happen averaging 63.4 minutes. The corridor runs roughly 954 miles and is served by 43 carriers. Over the most recent 24 months, 149 of 14,778 flights were cancelled (1.0%) and 12 diverted (0.1%).
The monthly split is wide on this route: Sep 2025 posted the strongest performance at 93% on-time, while Jun 2025 came in at just 77% - a 15-point swing worth factoring into travel timing.
On the multi-year calendar, LAX–SEA peaks in November at 89.9% on-time while August carries the heaviest traffic (~651 flights per month) ; the softest month is June at 81.9%, a 8.0-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does LAX to SEA rank among US routes by traffic? ▼
How often are flights delayed from LAX to SEA? ▼
What is the cancellation rate for LAX to SEA? ▼
How far is the flight from LAX to SEA? ▼
When is the best time to fly from LAX to SEA? ▼
Airports on this route
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Using LAX–SEA data
LAX–SEA runs 7.2 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare LAX and SEA airport profiles: delay causes and top routes differ even on the same corridor. LAX airport
- If your dates flex, November (89.9% on-time) beats June (81.9%) on this corridor. Seasonal chart
- 4 other routes post a similar 86.2% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.