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Route · MRY → SEA · 2020–2025 BTS data

Monterey to Seattle

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), MRY to SEA (Monterey to Seattle) ranks #4719 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

88.8%
On-time
+9.8 pts
vs US avg
65 min
Delay when late
732
Flights
#4719 of 4927
Corpus placement

Cancelled

0.8%

Best Month

Oct 2021 89%

Worst Month

Oct 2021 89%

Distance

750 mi

Carriers

4

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Jul 2024 31 5 0 0 OO
Sep 2023 30 6 0 0 OO
Aug 2023 31 8 0 0 OO
Jul 2023 31 6 0 0 OO
Oct 2022 31 3 0 0 OO,QX
Sep 2022 30 0 0 0 OO
Aug 2022 31 5 0 0 OO
Jul 2022 31 1 0 0 OO
Jun 2022 30 1 0 0 OO
May 2022 31 6 0 0 OO
Apr 2022 30 7 0 1 OO,QX
Mar 2022 31 2 0 0 OO,QX
Jan 2022 31 5 3 0 OO,QX
Dec 2021 31 4 2 0 QX
Nov 2021 32 1 0 0 QX,OO
Oct 2021 56 6 1 0 OO,QX
Sep 2021 30 2 0 0 OO,QX
Aug 2021 31 1 0 0 OO
Jul 2021 31 2 0 0 OO
Jun 2021 30 3 0 0 OO
May 2021 31 5 0 0 OO
Apr 2021 30 0 0 0 OO
Mar 2021 31 3 0 0 OO

MRY–SEA seasonal on-time pattern

Best: November (96.9%) · weakest: May (82.3%)

80%85%90%95%100% JanMarAprMayJunJulAugSepOctNovDec 87.1%

Strongest calendar month

November

96.9% on-time · ~32 flights/mo

Busiest calendar month

October

~44 flights/mo avg

Weakest calendar month

May

82.3% on-time · ~31 flights/mo

Cancellation Rate

0.8%

6 of 732 flights

Diversion Rate

0.1%

1 of 732 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

MRY - Monterey

Full on-time, delay-cause, and seasonal performance for Monterey, CA.

MRY on-time profile

SEA - Seattle

Full on-time, delay-cause, and seasonal performance for Seattle, WA.

SEA on-time profile

Compare the two airports

See MRY and SEA side by side on delays, cancellations, and reliability.

Compare MRY vs SEA

Origin-hub reliability standing

Among MRY's stronger departures

MRY → SEA posts a 88.8% on-time rate, landing in the ≥85% band with 4 of 7 BTS-tracked routes leaving Monterey. The same hub also shows 3 mid-band and 0 challenged departures · fleet-wide on-time rank #279 of 4927 (highest on-time = #1).

What the Data Says About MRY to SEA

Monterey to Seattle (MRY to SEA) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 88.8% on-time rate across 732 flights, with delays that do happen averaging 65.2 minutes. The corridor runs roughly 750 miles and is served by 4 carriers. Over the most recent 24 months, 6 of 732 flights were cancelled (0.8%) and 1 diverted (0.1%).

Monthly performance data for this route did not show a clear best/worst split in the sample window; review the monthly table above for period-by-period detail.

On the multi-year calendar, MRY–SEA peaks in November at 96.9% on-time while October carries the heaviest traffic (~44 flights per month) ; the softest month is May at 82.3%, a 14.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does MRY to SEA rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, MRY to SEA ranks #4719 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from MRY to SEA? ▼
Flights from Monterey to Seattle have a 88.8% on-time rate based on 732 flights. The average delay is 65.2 minutes. The best recent month was Oct 2021 with 89% on-time.
What is the cancellation rate for MRY to SEA? ▼
Over the last 24 months, 0.8% of flights on this route were cancelled (6 of 732 flights) and 0.1% were diverted.
How far is the flight from MRY to SEA? ▼
The flight distance from Monterey (MRY) to Seattle (SEA) is approximately 750 miles. This route is served by 4 carriers.

Airports on this route

MRY Airport

Monterey
SEA Airport

Seattle
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 MRY–SEA data

MRY–SEA runs 9.8 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare MRY and SEA airport profiles: delay causes and top routes differ even on the same corridor. MRY airport
  • If your dates flex, November (96.9% on-time) beats May (82.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 88.8% 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.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

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.