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3,748 km · Domestic

Baltimore/Washington International Thurgood Marshall (BWI) – Seattle–Tacoma (SEA)

In July 2026, 182 flights operated between Baltimore/Washington International Thurgood Marshall and Seattle–Tacoma (both directions), and 68.1% left on time, according to the US BTS.

Official · July 2026 according to the US BTS only airlines required to report on-time data to the US DOT

Flights per month

Only complete months are shown. A month appears once the source has published every day of it.

The most recent periods19 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January5769▲ 21.1%
February4756▲ 19.1%
March62620.0%
April7275▲ 4.2%
May1161160.0%
June172174▲ 1.2%
July184182▼ 1.1%
August185––
September180––
October110–in progress
November100––
December119––
Year to date (Jan–Jul)710734▲ 3.4%

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods19 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January77.2%71.0%▼ 8.0%
February78.7%87.5%▲ 11.2%
March75.8%74.2%▼ 2.1%
April68.1%86.7%▲ 27.3%
May59.5%75.0%▲ 26.1%
June70.9%71.8%▲ 1.3%
July69.6%68.1%▼ 2.2%
August76.2%––
September83.9%––
October90.9%–in progress
November87.0%––
December72.3%––
Year-to-date average (Jan–Jul)71.4%76.3%▲ 6.9%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January04–
February10▼ 100.0%
March00–
April10▼ 100.0%
May00–
June00–
July02–
August1––
September0––
October2–in progress
November0––
December1––
Year to date (Jan–Jul)26▲ 200.0%

Airlines on this route

  1. Alaska Airlines 85.4%
  2. Southwest Airlines 14.6%

Oct 1, 2024 – Jul 31, 2026

By direction

BWI → SEA

Scheduled flights
1,212
Flights operated
1,203
Cancelled
9 · 0.7%
On-time departures
73.1%

SEA → BWI

Scheduled flights
1,212
Flights operated
1,209
Cancelled
3 · 0.2%
On-time departures
78.2%

BWI → SEA and SEA → BWI counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Alaska Airlines AS 2,070 85.4% 77.4% 11
Southwest Airlines WN 354 14.6% 65.4% 1

Shares are of scheduled flights in the period shown. Codeshare flights are counted once, under the operating airline.

Flight timing & delays

Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.

Times are local to the departure airport of each flight; both directions are combined.

US domestic sectors recorded by BTS

Source: the US BTS · Oct 12, 2024 → Jul 31, 2026

Lowest average delay09:00–10:006.4min · 385 recorded · 384 measured
Gap to highest-delay hour10.8min09:00 ↔ 18:00
Recorded flights2,424BWI–SEA

Departure hour

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 07:00 · 80.7% · 444 recorded · 441 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 18 recorded · 18 measured · Source: the US BTS 09:00 · 81.8% · 385 recorded · 384 measured · Source: the US BTS 10:00 · 81.5% · 289 recorded · 287 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 12:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 9 recorded · 9 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 42 recorded · 42 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 27 recorded · 27 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 9 recorded · 9 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 17 recorded · 17 measured · Source: the US BTS 18:00 · 69.1% · 254 recorded · 252 measured · Source: the US BTS 19:00 · 69.8% · 361 recorded · 358 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · 73.4% · 414 recorded · 414 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 154 recorded · 153 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 07:00 · 8.4 min · 444 recorded · 441 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 18 recorded · 18 measured · Source: the US BTS 09:00 · 6.4 min · 385 recorded · 384 measured · Source: the US BTS 10:00 · 7.6 min · 289 recorded · 287 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 12:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 9 recorded · 9 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 42 recorded · 42 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 27 recorded · 27 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 9 recorded · 9 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 17 recorded · 17 measured · Source: the US BTS 18:00 · 17.2 min · 254 recorded · 252 measured · Source: the US BTS 19:00 · 14.3 min · 361 recorded · 358 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · 11.1 min · 414 recorded · 414 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 154 recorded · 153 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 07:00 · 444 · 444 recorded · 441 measured · Source: the US BTS 08:00 · 18 · 18 recorded · 18 measured · Source: the US BTS 09:00 · 385 · 385 recorded · 384 measured · Source: the US BTS 10:00 · 289 · 289 recorded · 287 measured · Source: the US BTS 11:00 · 1 · 1 recorded · 1 measured · Source: the US BTS 12:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 13:00 · 9 · 9 recorded · 9 measured · Source: the US BTS 14:00 · 42 · 42 recorded · 42 measured · Source: the US BTS 15:00 · 27 · 27 recorded · 27 measured · Source: the US BTS 16:00 · 9 · 9 recorded · 9 measured · Source: the US BTS 17:00 · 17 · 17 recorded · 17 measured · Source: the US BTS 18:00 · 254 · 254 recorded · 252 measured · Source: the US BTS 19:00 · 361 · 361 recorded · 358 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · 414 · 414 recorded · 414 measured · Source: the US BTS 22:00 · 154 · 154 recorded · 153 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

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View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00No observations———
01:00No observations———
02:00No observations———
03:00No observations———
04:00No observations———
05:00No observations———
06:00No observations———
07:0080.7%8.4 min441444
08:00Fewer than 200 measured departures—1818
09:0081.8%6.4 min384385
10:0081.5%7.6 min287289
11:00Fewer than 200 measured departures—11
12:00No observations———
13:00Fewer than 200 measured departures—99
14:00Fewer than 200 measured departures—4242
15:00Fewer than 200 measured departures—2727
16:00Fewer than 200 measured departures—99
17:00Fewer than 200 measured departures—1717
18:0069.1%17.2 min252254
19:0069.8%14.3 min358361
20:00No observations———
21:0073.4%11.1 min414414
22:00Fewer than 200 measured departures—153154
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 73.8% · 365 recorded · 363 measured · Source: the US BTS Tuesday · 80.1% · 317 recorded · 316 measured · Source: the US BTS Wednesday · 76.3% · 341 recorded · 341 measured · Source: the US BTS Thursday · 72.2% · 364 recorded · 363 measured · Source: the US BTS Friday · 74.4% · 364 recorded · 363 measured · Source: the US BTS Saturday · 79.0% · 308 recorded · 305 measured · Source: the US BTS Sunday · 75.1% · 365 recorded · 361 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Monday · 13.5 min · 365 recorded · 363 measured · Source: the US BTS Tuesday · 9.3 min · 317 recorded · 316 measured · Source: the US BTS Wednesday · 11.0 min · 341 recorded · 341 measured · Source: the US BTS Thursday · 14.8 min · 364 recorded · 363 measured · Source: the US BTS Friday · 10.9 min · 364 recorded · 363 measured · Source: the US BTS Saturday · 9.8 min · 308 recorded · 305 measured · Source: the US BTS Sunday · 12.0 min · 365 recorded · 361 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 365 · 365 recorded · 363 measured · Source: the US BTS Tuesday · 317 · 317 recorded · 316 measured · Source: the US BTS Wednesday · 341 · 341 recorded · 341 measured · Source: the US BTS Thursday · 364 · 364 recorded · 363 measured · Source: the US BTS Friday · 364 · 364 recorded · 363 measured · Source: the US BTS Saturday · 308 · 308 recorded · 305 measured · Source: the US BTS Sunday · 365 · 365 recorded · 361 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday73.8%13.5 min363365
Tuesday80.1%9.3 min316317
Wednesday76.3%11.0 min341341
Thursday72.2%14.8 min363364
Friday74.4%10.9 min363364
Saturday79.0%9.8 min305308
Sunday75.1%12.0 min361365

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Jan · Fewer than 200 measured departures · 130 recorded · 126 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 104 recorded · 103 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 124 recorded · 124 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 148 recorded · 147 measured · Source: the US BTS May · 67.2% · 232 recorded · 232 measured · Source: the US BTS Jun · 71.4% · 346 recorded · 346 measured · Source: the US BTS Jul · 68.9% · 368 recorded · 366 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 186 recorded · 185 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 180 recorded · 180 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 178 recorded · 176 measured · Source: the US BTS Nov · 87.5% · 200 recorded · 200 measured · Source: the US BTS Dec · 74.9% · 228 recorded · 227 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Jan · Fewer than 200 measured departures · 130 recorded · 126 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 104 recorded · 103 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 124 recorded · 124 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 148 recorded · 147 measured · Source: the US BTS May · 13.0 min · 232 recorded · 232 measured · Source: the US BTS Jun · 16.6 min · 346 recorded · 346 measured · Source: the US BTS Jul · 19.4 min · 368 recorded · 366 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 186 recorded · 185 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 180 recorded · 180 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 178 recorded · 176 measured · Source: the US BTS Nov · 2.6 min · 200 recorded · 200 measured · Source: the US BTS Dec · 8.9 min · 228 recorded · 227 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 130 · 130 recorded · 126 measured · Source: the US BTS Feb · 104 · 104 recorded · 103 measured · Source: the US BTS Mar · 124 · 124 recorded · 124 measured · Source: the US BTS Apr · 148 · 148 recorded · 147 measured · Source: the US BTS May · 232 · 232 recorded · 232 measured · Source: the US BTS Jun · 346 · 346 recorded · 346 measured · Source: the US BTS Jul · 368 · 368 recorded · 366 measured · Source: the US BTS Aug · 186 · 186 recorded · 185 measured · Source: the US BTS Sep · 180 · 180 recorded · 180 measured · Source: the US BTS Oct · 178 · 178 recorded · 176 measured · Source: the US BTS Nov · 200 · 200 recorded · 200 measured · Source: the US BTS Dec · 228 · 228 recorded · 227 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—126130
FebFewer than 200 measured departures—103104
MarFewer than 200 measured departures—124124
AprFewer than 200 measured departures—147148
May67.2%13.0 min232232
Jun71.4%16.6 min346346
Jul68.9%19.4 min366368
AugFewer than 200 measured departures—185186
SepFewer than 200 measured departures—180180
OctFewer than 200 measured departures—176178
Nov87.5%2.6 min200200
Dec74.9%8.9 min227228

Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.

Recorded outcomes

  • On time 75.3% 1,825
  • Delayed >15 min 24.2% 587
  • Cancelled 0.5% 12
  • Missing departure time 0.0% 0

All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.

On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.

Flight numbers on this route

13
13 of 13
Flight numbersBy direction DeparturesOn time
AS379 BWI → SEA 587 69.3%
AS378 SEA → BWI 501 81.4%
AS349 BWI → SEA 302 79.3%
AS344 SEA → BWI 301 78.0%
AS379 SEA → BWI 165 83.6%
WN1503 SEA → BWI 60 63.3%
WN4250 SEA → BWI 58 77.6%
AS786 BWI → SEA 52 80.4%
AS781 SEA → BWI 51 72.6%
AS764 BWI → SEA 48 79.2%
AS308 BWI → SEA 42 92.9%
WN3613 SEA → BWI 42 57.1%
WN1595 BWI → SEA 33 87.9%

Flight numbers are the codes sold on tickets. On shared flights one aircraft can carry several of them. Only numbers with at least 30 flights have a page.

Monthly figures
PeriodFlights operated Change vs last yearCancelled On-time departures
July 2026 182 −1.1% 2 68.1%
June 2026 174 +1.2% 0 71.8%
May 2026 116 +0.0% 0 75.0%
April 2026 75 +4.2% 0 86.7%
March 2026 62 +0.0% 0 74.2%
February 2026 56 +19.1% 0 87.5%
January 2026 69 +21.1% 4 71.0%
December 2025 119 +10.2% 1 72.3%
November 2025 100 +0.0% 0 87.0%
October 2025 110 +66.7% 2 90.9%
September 2025 180 0 83.9%
August 2025 185 1 76.2%
July 2025 184 0 69.6%
June 2025 172 0 70.9%
May 2025 116 0 59.5%
April 2025 72 1 68.1%
March 2025 62 0 75.8%
February 2025 47 1 78.7%
January 2025 57 0 77.2%
December 2024 108 0 77.8%
November 2024 100 0 88.0%
October 2024 66 0 71.2%

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