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3,411 km · Domestic

Pittsburgh (PIT) – Seattle–Tacoma (SEA)

In July 2026, 121 flights operated between Pittsburgh and Seattle–Tacoma (both directions), and 66.9% 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
January3443▲ 26.5%
February4041▲ 2.5%
March5452▼ 3.7%
April60600.0%
May97100▲ 3.1%
June1201200.0%
July1211210.0%
August116––
September104––
October65–in progress
November52––
December58––
Year to date (Jan–Jul)526537▲ 2.1%

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
January61.8%74.4%▲ 20.4%
February75.0%78.0%▲ 4.0%
March74.1%67.3%▼ 9.2%
April83.3%75.0%▼ 10.0%
May74.2%84.0%▲ 13.2%
June63.3%79.2%▲ 25.1%
July64.5%66.9%▲ 3.7%
August61.2%––
September84.6%––
October87.7%–in progress
November84.6%––
December63.8%––
Year-to-date average (Jan–Jul)70.9%75.0%▲ 5.8%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January14▲ 300.0%
February00–
March20▼ 100.0%
April00–
May01–
June00–
July31▼ 66.7%
August0––
September0––
October2–in progress
November0––
December0––
Year to date (Jan–Jul)660.0%

Airlines on this route

  1. Alaska Airlines 99.9%
  2. Delta Air Lines 0.1%

Oct 1, 2024 – Jul 31, 2026

By direction

PIT → SEA

Scheduled flights
829
Flights operated
817
Cancelled
12 · 1.4%
On-time departures
75.9%

SEA → PIT

Scheduled flights
791
Flights operated
787
Cancelled
4 · 0.5%
On-time departures
73.6%

PIT → SEA and SEA → PIT counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Alaska Airlines AS 1,618 99.9% 74.7% 16
Delta Air Lines DL 2 0.1% 100.0% 0

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 delay19:00–20:0012.3min · 434 recorded · 430 measured
Gap to highest-delay hour3.8min19:00 ↔ 11:00
Recorded flights1,620PIT–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 · Fewer than 200 measured departures · 107 recorded · 105 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 133 recorded · 131 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 127 recorded · 125 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 172 recorded · 172 measured · Source: the US BTS 11:00 · 63.7% · 281 recorded · 278 measured · Source: the US BTS 12:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 73 recorded · 73 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 3 recorded · 3 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 16:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 17:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 79 recorded · 77 measured · Source: the US BTS 19:00 · 72.3% · 434 recorded · 430 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 29 recorded · 29 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 51 recorded · 51 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 130 recorded · 129 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 · Fewer than 200 measured departures · 107 recorded · 105 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 133 recorded · 131 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 127 recorded · 125 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 172 recorded · 172 measured · Source: the US BTS 11:00 · 16.0 min · 281 recorded · 278 measured · Source: the US BTS 12:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 73 recorded · 73 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 3 recorded · 3 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 16:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 17:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 79 recorded · 77 measured · Source: the US BTS 19:00 · 12.3 min · 434 recorded · 430 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 29 recorded · 29 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 51 recorded · 51 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 130 recorded · 129 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 · 107 · 107 recorded · 105 measured · Source: the US BTS 08:00 · 133 · 133 recorded · 131 measured · Source: the US BTS 09:00 · 127 · 127 recorded · 125 measured · Source: the US BTS 10:00 · 172 · 172 recorded · 172 measured · Source: the US BTS 11:00 · 281 · 281 recorded · 278 measured · Source: the US BTS 12:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 13:00 · 73 · 73 recorded · 73 measured · Source: the US BTS 14:00 · 3 · 3 recorded · 3 measured · Source: the US BTS 15:00 · 1 · 1 recorded · 1 measured · Source: the US BTS 16:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 17:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 18:00 · 79 · 79 recorded · 77 measured · Source: the US BTS 19:00 · 434 · 434 recorded · 430 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · 29 · 29 recorded · 29 measured · Source: the US BTS 22:00 · 51 · 51 recorded · 51 measured · Source: the US BTS 23:00 · 130 · 130 recorded · 129 measured · Source: the US BTS

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

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———
07:00Fewer than 200 measured departures—105107
08:00Fewer than 200 measured departures—131133
09:00Fewer than 200 measured departures—125127
10:00Fewer than 200 measured departures—172172
11:0063.7%16.0 min278281
12:00No observations———
13:00Fewer than 200 measured departures—7373
14:00Fewer than 200 measured departures—33
15:00Fewer than 200 measured departures—11
16:00No observations———
17:00No observations———
18:00Fewer than 200 measured departures—7779
19:0072.3%12.3 min430434
20:00No observations———
21:00Fewer than 200 measured departures—2929
22:00Fewer than 200 measured departures—5151
23:00Fewer than 200 measured departures—129130

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 74.4% · 244 recorded · 242 measured · Source: the US BTS Tuesday · 81.6% · 208 recorded · 207 measured · Source: the US BTS Wednesday · 82.1% · 240 recorded · 240 measured · Source: the US BTS Thursday · 73.3% · 241 recorded · 240 measured · Source: the US BTS Friday · 71.6% · 250 recorded · 243 measured · Source: the US BTS Saturday · Fewer than 200 measured departures · 198 recorded · 195 measured · Source: the US BTS Sunday · 67.9% · 239 recorded · 237 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 · 11.9 min · 244 recorded · 242 measured · Source: the US BTS Tuesday · 4.0 min · 208 recorded · 207 measured · Source: the US BTS Wednesday · 6.2 min · 240 recorded · 240 measured · Source: the US BTS Thursday · 10.9 min · 241 recorded · 240 measured · Source: the US BTS Friday · 13.0 min · 250 recorded · 243 measured · Source: the US BTS Saturday · Fewer than 200 measured departures · 198 recorded · 195 measured · Source: the US BTS Sunday · 17.1 min · 239 recorded · 237 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 · 244 · 244 recorded · 242 measured · Source: the US BTS Tuesday · 208 · 208 recorded · 207 measured · Source: the US BTS Wednesday · 240 · 240 recorded · 240 measured · Source: the US BTS Thursday · 241 · 241 recorded · 240 measured · Source: the US BTS Friday · 250 · 250 recorded · 243 measured · Source: the US BTS Saturday · 198 · 198 recorded · 195 measured · Source: the US BTS Sunday · 239 · 239 recorded · 237 measured · Source: the US BTS

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

View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday74.4%11.9 min242244
Tuesday81.6%4.0 min207208
Wednesday82.1%6.2 min240240
Thursday73.3%10.9 min240241
Friday71.6%13.0 min243250
SaturdayFewer than 200 measured departures—195198
Sunday67.9%17.1 min237239

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 · 82 recorded · 77 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 81 recorded · 81 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 108 recorded · 106 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 120 recorded · 120 measured · Source: the US BTS May · Fewer than 200 measured departures · 198 recorded · 197 measured · Source: the US BTS Jun · 71.3% · 240 recorded · 240 measured · Source: the US BTS Jul · 65.7% · 246 recorded · 242 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 116 recorded · 116 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 104 recorded · 104 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 107 recorded · 104 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 108 recorded · 108 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 110 recorded · 109 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 · 82 recorded · 77 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 81 recorded · 81 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 108 recorded · 106 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 120 recorded · 120 measured · Source: the US BTS May · Fewer than 200 measured departures · 198 recorded · 197 measured · Source: the US BTS Jun · 14.1 min · 240 recorded · 240 measured · Source: the US BTS Jul · 15.4 min · 246 recorded · 242 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 116 recorded · 116 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 104 recorded · 104 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 107 recorded · 104 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 108 recorded · 108 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 110 recorded · 109 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 · 82 · 82 recorded · 77 measured · Source: the US BTS Feb · 81 · 81 recorded · 81 measured · Source: the US BTS Mar · 108 · 108 recorded · 106 measured · Source: the US BTS Apr · 120 · 120 recorded · 120 measured · Source: the US BTS May · 198 · 198 recorded · 197 measured · Source: the US BTS Jun · 240 · 240 recorded · 240 measured · Source: the US BTS Jul · 246 · 246 recorded · 242 measured · Source: the US BTS Aug · 116 · 116 recorded · 116 measured · Source: the US BTS Sep · 104 · 104 recorded · 104 measured · Source: the US BTS Oct · 107 · 107 recorded · 104 measured · Source: the US BTS Nov · 108 · 108 recorded · 108 measured · Source: the US BTS Dec · 110 · 110 recorded · 109 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—7782
FebFewer than 200 measured departures—8181
MarFewer than 200 measured departures—106108
AprFewer than 200 measured departures—120120
MayFewer than 200 measured departures—197198
Jun71.3%14.1 min240240
Jul65.7%15.4 min242246
AugFewer than 200 measured departures—116116
SepFewer than 200 measured departures—104104
OctFewer than 200 measured departures—104107
NovFewer than 200 measured departures—108108
DecFewer than 200 measured departures—109110

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 74.0% 1,199
  • Delayed >15 min 25.0% 405
  • Cancelled 1.0% 16
  • 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

9
9 of 9
Flight numbersBy direction DeparturesOn time
AS412 SEA → PIT 576 71.6%
AS412 PIT → SEA 472 71.7%
AS101 PIT → SEA 116 83.2%
AS340 SEA → PIT 69 76.5%
AS341 PIT → SEA 69 71.6%
AS604 PIT → SEA 61 85.3%
AS1192 SEA → PIT 60 81.7%
AS77 SEA → PIT 51 70.6%
AS78 PIT → SEA 51 76.5%

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 121 +0.0% 1 66.9%
June 2026 120 +0.0% 0 79.2%
May 2026 100 +3.1% 1 84.0%
April 2026 60 +0.0% 0 75.0%
March 2026 52 −3.7% 0 67.3%
February 2026 41 +2.5% 0 78.0%
January 2026 43 +26.5% 4 74.4%
December 2025 58 +13.7% 0 63.8%
November 2025 52 −7.1% 0 84.6%
October 2025 65 +66.7% 2 87.7%
September 2025 104 0 84.6%
August 2025 116 0 61.2%
July 2025 121 3 64.5%
June 2025 120 0 63.3%
May 2025 97 0 74.2%
April 2025 60 0 83.3%
March 2025 54 2 74.1%
February 2025 40 0 75.0%
January 2025 34 1 61.8%
December 2024 51 1 86.3%
November 2024 56 0 96.4%
October 2024 39 1 84.6%

How to read this chart

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