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Route on-time record

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

Seattle (Seattle–Tacoma International Airport) to Bellingham (Bellingham International Airport). 1,276 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 2.1% were cancelled. The most reliable flight number was SkyWest 3460 at 11:03 PM.

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

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SEA → BLI

Seattle to Bellingham: 1,276 nonstop flights a year

On time (12 months)

83%

Cancelled

2.1%

avg delay 9 min

Best time to leave

6 to 9 PM

91% on time vs 77% 9 AM to noon

Most reliable airline

SkyWest

82% chance on time

Check SEA to BLI 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. #1 · SkyWest 3460 · sold as United Express, Delta Connection, American Eagle or Alaska

    11:03 PM → 11:59 PM56m nonstop

    Local times, typical schedule. Last flown 2026-05-12.

    89%

    chance on time

    On time (history)
    93%
    Cancelled
    3.4%
    Avg arrival delay
    3 min
    • Arrived on time 93% of the time (201 flights, Jun 2025 to May 2026).
    • Cancelled 3.4% of the time (7 of 208).
    • 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 · 201 flights

    Find 11:03 PM flight fares Opens this date on Aviasales

  2. #2 · SkyWest 3288 · sold as United Express, Delta Connection, American Eagle or Alaska

    11:10 PM → 12:07 AM57m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    87%

    chance on time

    On time (history)
    90%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 90% of the time (30 flights, Jun 2025 to May 2026).
    • Never cancelled in 30 scheduled flights.
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).

    Limited track record · 30 flights

    Find 11:10 PM flight fares Opens this date on Aviasales

  3. #3 · SkyWest 3433 · sold as United Express, Delta Connection, American Eagle or Alaska

    4:44 PM → 5:39 PM55m nonstop

    Local times, typical schedule. Last flown 2026-05-12.

    82%

    chance on time

    On time (history)
    86%
    Cancelled
    3.2%
    Avg arrival delay
    10 min
    • Arrived on time 86% of the time (181 flights, Jun 2025 to May 2026).
    • Cancelled 3.2% of the time (6 of 187).
    • Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.

    Moderate track record · 181 flights

    Find 4:44 PM flight fares Opens this date on Aviasales

  4. #4 · SkyWest 3438 · sold as United Express, Delta Connection, American Eagle or Alaska

    4:18 PM → 5:13 PM55m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    81%

    chance on time

    On time (history)
    79%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 79% of the time (120 flights, Jun 2025 to May 2026).
    • Never cancelled in 120 scheduled flights.
    • Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
    • 59% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 120 flights

    Find 4:18 PM flight fares Opens this date on Aviasales

  5. #5 · SkyWest 3294 · sold as United Express, Delta Connection, American Eagle or Alaska

    11:20 AM → 12:16 PM56m nonstop

    Local times, typical schedule. Last flown 2026-05-12.

    80%

    chance on time

    On time (history)
    84%
    Cancelled
    3.5%
    Avg arrival delay
    8 min
    • Arrived on time 84% of the time (218 flights, Jun 2025 to May 2026).
    • Cancelled 3.5% of the time (8 of 226).
    • Leaves in this route's least on-time window (9 AM to noon: 77% on time; 6 to 9 PM: 91%).
    • 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 · 218 flights

    Find 11:20 AM flight fares Opens this date on Aviasales

  6. #6 · SkyWest 3400 · sold as United Express, Delta Connection, American Eagle or Alaska

    12:18 PM → 1:20 PM1h 02m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    74%

    chance on time

    On time (history)
    69%
    Cancelled
    0.8%
    Avg arrival delay
    17 min
    • Arrived on time 69% of the time (119 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).
    • 51% of its delay minutes came from the plane arriving late from an earlier flight.

    Moderate track record · 119 flights

    Find 12:18 PM flight fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)82%

    1,276 flights · 83% on time as flown · 2.1% cancel

On time by departure time

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

  • 9 AM to noon77%

    345 flights · avg delay 12 min

  • Noon to 3 PM82%

    251 flights · avg delay 12 min

  • 3 to 6 PM85%

    91 flights · avg delay 10 min

  • 6 to 9 PM91%

    169 flights · avg delay 5 min

  • After 9 PM86%

    420 flights · avg delay 7 min

Best day: Wednesday (86%). Worst: Sunday (79%).

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.

J
85
F
83
M
82
A
87
M
84
J
77
J
82
A
79
S
81
O
86
N
88
D
84

What delays this route

  • Late-arriving aircraft53%
  • Airline (crew, maintenance, boarding)27%
  • Air traffic control and airport volume16%
  • Severe weather4%

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

Finding the most reliable connections from SEA to BLI…

SEA to BLI questions

What time of day is best to fly SEA to BLI?
6 to 9 PM: 91% of flights arrived on time, against 77% for departures 9 AM to noon.
Which airline is most on time from SEA to BLI?
SkyWest, with a season-adjusted 82% chance of operating and arriving on time over 1,276 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 BLI?
June (77% on time); the best was November (88%), 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.

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Live status: FAA delays and ground stops