Route · SEA → BLI · 2020–2025 BTS data
Seattle to Bellingham
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SEA to BLI (Seattle to Bellingham) ranks #2089 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 85.1%
- On-time
- +6.1 pts
- vs US avg
- 51 min
- Delay when late
- 5,958
- Flights
- #2089 of 4927
- Corpus placement
Cancelled
1.4%
Best Month
Dec 2024 94%
Worst Month
Jun 2025 71%
Distance
93 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 124 | 29 | 3 | 0 | OO |
| Nov 2025 | 97 | 13 | 10 | 0 | OO |
| Oct 2025 | 116 | 16 | 2 | 0 | OO |
| Sep 2025 | 120 | 18 | 0 | 0 | OO |
| Aug 2025 | 124 | 23 | 1 | 0 | OO |
| Jul 2025 | 124 | 23 | 1 | 0 | OO |
| Jun 2025 | 119 | 35 | 0 | 0 | OO |
| May 2025 | 119 | 25 | 0 | 0 | OO |
| Apr 2025 | 96 | 14 | 0 | 0 | OO |
| Mar 2025 | 103 | 27 | 1 | 0 | OO |
| Feb 2025 | 105 | 30 | 3 | 0 | OO |
| Jan 2025 | 113 | 16 | 5 | 0 | OO |
| Dec 2024 | 82 | 5 | 4 | 0 | OO |
| Nov 2024 | 83 | 10 | 1 | 0 | OO |
| Oct 2024 | 88 | 14 | 0 | 0 | OO |
| Sep 2024 | 85 | 24 | 1 | 0 | OO |
| Aug 2024 | 88 | 24 | 0 | 0 | OO |
| Jul 2024 | 88 | 22 | 0 | 0 | OO |
| Jun 2024 | 85 | 20 | 0 | 0 | OO |
| May 2024 | 83 | 11 | 0 | 0 | OO |
| Apr 2024 | 83 | 15 | 0 | 0 | OO |
| Mar 2024 | 80 | 8 | 0 | 0 | OO |
| Feb 2024 | 58 | 5 | 0 | 0 | OO |
| Jan 2024 | 62 | 8 | 0 | 0 | OO |
SEA–BLI seasonal on-time pattern
Best: October (89.6%) · weakest: June (80.0%)
Strongest calendar month
October
89.6% on-time · ~112 flights/mo
Busiest calendar month
July
~115 flights/mo avg
Weakest calendar month
June
80.0% on-time · ~104 flights/mo
Cancellation Rate
1.4%
32 of 2,325 flights
Diversion Rate
0.0%
0 of 2,325 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
SEA on-time profileBLI - Bellingham
Full on-time, delay-cause, and seasonal performance for Bellingham, WA.
BLI on-time profileCompare the two airports
See SEA and BLI side by side on delays, cancellations, and reliability.
Compare SEA vs BLIOrigin-hub reliability standing
Among SEA's stronger departures
SEA → BLI posts a 85.1% on-time rate, landing in the ≥85% band with 25 of 89 BTS-tracked routes leaving Seattle. The same hub also shows 63 mid-band and 1 challenged departures · fleet-wide on-time rank #1194 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to SEA–BLI.
Routes with a similar on-time rate
What the Data Says About SEA to BLI
Seattle to Bellingham (SEA to BLI) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.1% on-time rate across 5,958 flights, with delays that do happen averaging 51.4 minutes. The corridor runs roughly 93 miles and is served by 2 carriers. Over the most recent 24 months, 32 of 2,325 flights were cancelled (1.4%) and 0 diverted (0.0%).
The monthly split is wide on this route: Dec 2024 posted the strongest performance at 94% on-time, while Jun 2025 came in at just 71% - a 23-point swing worth factoring into travel timing.
On the multi-year calendar, SEA–BLI peaks in October at 89.6% on-time while July carries the heaviest traffic (~115 flights per month) ; the softest month is June at 80.0%, a 9.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does SEA to BLI rank among US routes by traffic? ▼
How often are flights delayed from SEA to BLI? ▼
What is the cancellation rate for SEA to BLI? ▼
How far is the flight from SEA to BLI? ▼
When is the best time to fly from SEA to BLI? ▼
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 SEA–BLI data
SEA–BLI runs 6.1 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare SEA and BLI airport profiles: delay causes and top routes differ even on the same corridor. SEA airport
- If your dates flex, October (89.6% on-time) beats June (80.0%) on this corridor. Seasonal chart
- 4 other routes post a similar 85.1% 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.