Route
BOS → SEA
Boston Logan International Airport Seattle–Tacoma International Airport
How punctual is this route?
- On-time arrivals
- 70.1%
- Less than 15 minutes late
- Cancelled
- 1.5%
- Of scheduled flights
- Average delay when late
- 60 min
- Flights arriving 15+ minutes late
- Flights tracked
- 2,555
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 37%
- Air traffic control & airport 36%
- Airline (crew, maintenance, cleaning) 24%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 84.2% | 229 |
| October 2025 | 79.6% | 228 |
| November 2025 | 77.8% | 163 |
| December 2025 | 39.2% | 161 |
| January 2026 | 70.2% | 131 |
| February 2026 | 75.0% | 128 |
| March 2026 | 40.0% | 172 |
| April 2026 | 77.2% | 172 |
| May 2026 | 79.1% | 254 |
| June 2026 | 74.5% | 278 |
| July 2026 | 70.5% | 317 |
| August 2026 | 62.9% | 322 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Alaska Airlines | 1,240 | 69.1% | 1.4% | 56 min |
| Delta Air Lines | 1,068 | 71.1% | 1.6% | 62 min |
| JetBlue Airways | 247 | 70.8% | 1.6% | 68 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL384
26% late · 365 flights
-
AS459
28% late · 364 flights
-
DL324
35% late · 363 flights
-
DL332
25% late · 247 flights
-
B6397
15% late · 165 flights
-
AS537
15% late · 153 flights
-
AS306
42% late · 129 flights
-
AS215
37% late · 98 flights
-
DL2889
27% late · 92 flights
-
B6197
58% late · 82 flights
-
AS304
49% late · 70 flights
-
AS338
26% late · 70 flights
-
AS1337
46% late · 59 flights
-
AS819
43% late · 55 flights
-
AS307
51% late · 42 flights
-
AS309
12% late · 36 flights
-
AS299
33% late · 34 flights
-
AS393
12% late · 33 flights
-
AS1506
26% late · 31 flights
-
AS260
25% late · 28 flights
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