Route on-time record
BLI to SEA: most on-time flights and the best time to fly
Bellingham (Bellingham International Airport) to Seattle (Seattle–Tacoma International Airport). 1,277 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 3448 at 5:20 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
BLI → SEA
Bellingham to Seattle: 1,277 nonstop flights a year
On time (12 months)
83%
Cancelled
2.1%
avg delay 10 min
Best time to leave
Before 9 AM
92% on time vs 73% 3 to 6 PM
Most reliable airline
SkyWest
81% chance on time
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 · SkyWest 3448 · sold as United Express, Delta Connection, American Eagle or Alaska
5:20 AM → 6:13 AM53m nonstop
Local times, typical schedule. Last flown 2026-05-12.
90%
chance on time
- On time (history)
- 94%
- Cancelled
- 3.4%
- Avg arrival delay
- 3 min
- Arrived on time 94% of the time (200 flights, Jun 2025 to May 2026).
- Cancelled 3.4% of the time (7 of 208).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 3 to 6 PM: 73%).
Strong track record · 200 flights
Find 5:20 AM flight fares Opens this date on Aviasales#2 · SkyWest 3303 · sold as United Express, Delta Connection, American Eagle or Alaska
6:00 AM → 6:51 AM51m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 92% of the time (50 flights, Jun 2025 to May 2026).
- Never cancelled in 50 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 3 to 6 PM: 73%).
Limited track record · 50 flights
Find 6:00 AM flight fares Opens this date on Aviasales#3 · SkyWest 3294 · sold as United Express, Delta Connection, American Eagle or Alaska
12:56 PM → 1:50 PM56m nonstop
Local times, typical schedule. Last flown 2026-05-12.
80%
chance on time
- On time (history)
- 85%
- Cancelled
- 4.0%
- Avg arrival delay
- 10 min
- Arrived on time 85% of the time (218 flights, Jun 2025 to May 2026).
- Cancelled 4.0% of the time (9 of 227).
- 63% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 218 flights
Find 12:56 PM flight fares Opens this date on Aviasales#4 · SkyWest 3433 · sold as United Express, Delta Connection, American Eagle or Alaska
6:19 PM → 7:14 PM55m nonstop
Local times, typical schedule. Last flown 2026-05-12.
80%
chance on time
- On time (history)
- 83%
- Cancelled
- 4.5%
- Avg arrival delay
- 12 min
- Arrived on time 83% of the time (126 flights, Jun 2025 to May 2026).
- Cancelled 4.5% of the time (6 of 132).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 126 flights
Find 6:19 PM flight fares Opens this date on Aviasales#5 · SkyWest 3438 · sold as United Express, Delta Connection, American Eagle or Alaska
5:53 PM → 6:50 PM57m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 73%
- Cancelled
- 0.0%
- Avg arrival delay
- 16 min
- Arrived on time 73% of the time (120 flights, Jun 2025 to May 2026).
- Never cancelled in 120 scheduled flights.
- Leaves in this route's least on-time window (3 to 6 PM: 73% on time; Before 9 AM: 92%).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 120 flights
Find 5:53 PM flight fares Opens this date on Aviasales#6 · SkyWest 3400 · sold as United Express, Delta Connection, American Eagle or Alaska
2:00 PM → 2:55 PM55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
- On time (history)
- 63%
- Cancelled
- 0.8%
- Avg arrival delay
- 19 min
- Arrived on time 63% of the time (119 flights, Jun 2025 to May 2026).
- 59% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 119 flights
Find 2:00 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)81%
1,277 flights · 83% on time as flown · 2.1% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
539 flights · avg delay 6 min
- 9 AM to noon77%
85 flights · avg delay 16 min
- Noon to 3 PM77%
331 flights · avg delay 13 min
- 3 to 6 PM73%
266 flights · avg delay 16 min
- 6 to 9 PM89%
56 flights · avg delay 5 min
Best day: Saturday (83%). Worst: Thursday (78%).
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.
What delays this route
- Late-arriving aircraft45%
- Airline (crew, maintenance, boarding)32%
- Air traffic control and airport volume14%
- Severe weather9%
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
BLI to SEA questions
- What time of day is best to fly BLI to SEA?
- Before 9 AM: 92% of flights arrived on time, against 73% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from BLI to SEA?
- SkyWest, with a season-adjusted 81% chance of operating and arriving on time over 1,277 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 BLI to SEA?
- September (73% on time); the best was July (86%), 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.
More routes from BLI
Live status: FAA delays and ground stops