Flight number record
AS 379
Alaska Airlines · Baltimore to Seattle
- Route
- BWI → SEA
- Departs
- 18:07
- Flights
- 336
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 379, check with Alaska Airlines.
AS 379 draws a D+. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about 50 minutes behind schedule. Build slack into anything you connect to. That rests on 336 flights, with a median arrival 5 minutes late.
The national on-time rate over the same period is 77.3%, so AS 379 runs 15 points behind the country as a whole. Across a thousand flights that is about 153 extra late arrivals.
Key figures
On time
62.0%
Arrivals under 15 minutes late, of 334 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
0.60%
National rate is 1.89%
1 hour+ late
9.0%
National rate is 8.3%
These figures cover 336 flights between September 2025 and August 2026. Beyond the headline rate, 9.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When AS 379 flies
AS 379 flies BWI to SEA without a single fixed slot. Its most common scheduled departure was 18:07, used on 69 of 336 flights, with 19:16 (43 flights) and 19:14 (35 flights) next.
- Departs 18:0769 flights20.5%
- Departs 19:1643 flights12.8%
- Departs 19:1435 flights10.4%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 18:07 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AS 379 runs 6 points worse at 62.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AS 379 next to BWI to SEA
Every carrier on BWI to SEA combined arrived on time 66.8% of the time across 719 flights, so AS 379 is 5 points behind it. Alaska flew 599 flights on the same city pair under all its flight numbers, including this one, and those ran 68.2% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 18 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 379thin sample | 336 | 62.0% | 49 min | 0.60% | D+ |
| All Alaska Airlines on BWI–SEA | 599 | 68.2% | 49 min | 0.83% | C+ |
| All carriers on BWI–SEA | 719 | 66.8% | 52 min | 0.83% | C+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 379 quarter by quarter
AS 379 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Jul–Sep 2026 at 50.8%, a swing of 36 points on roughly 67 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights86.7%
- Oct–Dec 202571 flights61.4%
- Jan–Mar 202688 flights62.1%
- Apr–Jun 202686 flights61.6%
- Jul–Sep 202661 flights50.8%
Scale runs 40% to 90%.
By weekday, AS 379 did best on Wednesday at 66.0% on time and worst on Thursday at 52.9%. Each day rests on about 48 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 379 runs when it is late
The 127 late arrivals split 57 under half an hour, 40 between 30 and 60 minutes, and 30 an hour or more.
- 15+ min early64 flights19.2%
- Within 15 min143 flights42.8%
- 15–29 min late57 flights17.1%
- 30–59 min late40 flights12.0%
- 1–2 hours late19 flights5.7%
- 2+ hours late11 flights3.3%
Scale runs 0% to 100%.
Share of 334 completed flights by arrival against schedule.
20 of 92 late departures made up the time and arrived on time, 22% of them. In the other direction, 55 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.
The worst days
Worst days for AS 379
The latest arrival of the period was on 11 June 2026, 4 hours 56 minutes behind schedule; most of its delay minutes were filed as extreme weather. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 June 2026 | 4 hours 56 minutes | Extreme weather |
| 13 March 2026 | 4 hours 18 minutes | Late-arriving aircraft |
| 18 July 2026 | 3 hours 7 minutes | Extreme weather |
| 14 June 2026 | 3 hours 5 minutes | Extreme weather |
| 3 December 2025 | 2 hours 49 minutes | Carrier |
Delay causes
Why AS 379 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,234 reported delay minutes.
- 35%National Airspace System
- 31%Late-arriving aircraft
- 17%Extreme weather
- 13%Carrier
- 3%Security
Extreme weather accounts for 17% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.9 times the usual weather exposure. The split is drawn from 6,234 delay minutes reported on AS 379.
Cancellations are rare at 0.60%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
9.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 2,335 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on one other city pair in the data, including SEA to BWI (28), but none flew often enough under AS 379 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BWI to SEA only.
One caution: this is a thin sample. 336 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking AS 379
For a booking, read AS 379 as 62.0% on time with 0.60% cancelled over 336 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- BWI to SEA, every carrier and departure
- SEA to BWI, the return direction
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Alaska Airlines on-time record
- Every Alaska Airlines flight number with a record
- The most and least reliable flight numbers in the US
- How often a connection fails at the major US hubs
A flight number here means Alaska Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.