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1,540 km · Domestic

Ontario (ONT) – Seattle–Tacoma (SEA)

In July 2026, 505 flights operated between Ontario and Seattle–Tacoma (both directions), and 76.4% 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
January329313▼ 4.9%
February284270▼ 4.9%
March366348▼ 4.9%
April404399▼ 1.2%
May512494▼ 3.5%
June530473▼ 10.8%
July585505▼ 13.7%
August529––
September425––
October396–in progress
November408––
December396––
Year to date (Jan–Jul)3,0102,802▼ 6.9%

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
January83.0%83.7%▲ 0.8%
February80.3%88.5%▲ 10.2%
March86.6%86.2%▼ 0.5%
April89.6%91.0%▲ 1.6%
May87.9%87.2%▼ 0.8%
June81.7%84.6%▲ 3.5%
July77.4%76.4%▼ 1.3%
August83.0%––
September89.4%––
October87.1%–in progress
November85.5%––
December80.6%––
Year-to-date average (Jan–Jul)83.8%85.4%▲ 1.9%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January42▼ 50.0%
February100▼ 100.0%
March06–
April01–
May440.0%
June37▲ 133.3%
July197▼ 63.2%
August3––
September1––
October4–in progress
November14––
December4––
Year to date (Jan–Jul)4027▼ 32.5%

Airlines on this route

  1. Alaska Airlines 49.1%
  2. SkyWest Airlines 42.5%
  3. Frontier Airlines 7.8%
  4. Delta Air Lines 0.6%

Oct 1, 2024 – Jul 31, 2026

By direction

ONT → SEA

Scheduled flights
4,566
Flights operated
4,518
Cancelled
48 · 1.1%
On-time departures
87.1%

SEA → ONT

Scheduled flights
4,567
Flights operated
4,518
Cancelled
49 · 1.1%
On-time departures
82.7%

ONT → SEA and SEA → ONT counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Alaska Airlines AS 4,483 49.1% 79.6% 80
SkyWest Airlines OO 3,883 42.5% 91.6% 9
Frontier Airlines F9 709 7.8% 80.9% 8
Delta Air Lines DL 58 0.6% 91.4% 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 delay06:00–07:00-0.7min · 1,087 recorded · 1,081 measured
Gap to highest-delay hour16.1min06:00 ↔ 21:00
Recorded flights9,133ONT–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 · Fewer than 200 measured departures · 99 recorded · 99 measured · Source: the US BTS 06:00 · 95.0% · 1,087 recorded · 1,081 measured · Source: the US BTS 07:00 · 92.1% · 419 recorded · 417 measured · Source: the US BTS 08:00 · 91.0% · 811 recorded · 788 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 95 recorded · 94 measured · Source: the US BTS 10:00 · 83.5% · 460 recorded · 455 measured · Source: the US BTS 11:00 · 89.4% · 1,041 recorded · 1,028 measured · Source: the US BTS 12:00 · 80.1% · 591 recorded · 573 measured · Source: the US BTS 13:00 · 73.8% · 313 recorded · 309 measured · Source: the US BTS 14:00 · 86.6% · 732 recorded · 729 measured · Source: the US BTS 15:00 · 76.6% · 527 recorded · 525 measured · Source: the US BTS 16:00 · 82.0% · 564 recorded · 554 measured · Source: the US BTS 17:00 · 85.3% · 580 recorded · 578 measured · Source: the US BTS 18:00 · 76.3% · 263 recorded · 262 measured · Source: the US BTS 19:00 · 83.0% · 863 recorded · 860 measured · Source: the US BTS 20:00 · 76.1% · 324 recorded · 322 measured · Source: the US BTS 21:00 · 67.8% · 362 recorded · 360 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 2 recorded · 2 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 · Fewer than 200 measured departures · 99 recorded · 99 measured · Source: the US BTS 06:00 · -0.7 min · 1,087 recorded · 1,081 measured · Source: the US BTS 07:00 · -0.1 min · 419 recorded · 417 measured · Source: the US BTS 08:00 · 0.6 min · 811 recorded · 788 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 95 recorded · 94 measured · Source: the US BTS 10:00 · 6.4 min · 460 recorded · 455 measured · Source: the US BTS 11:00 · 4.2 min · 1,041 recorded · 1,028 measured · Source: the US BTS 12:00 · 8.1 min · 591 recorded · 573 measured · Source: the US BTS 13:00 · 12.0 min · 313 recorded · 309 measured · Source: the US BTS 14:00 · 3.1 min · 732 recorded · 729 measured · Source: the US BTS 15:00 · 8.8 min · 527 recorded · 525 measured · Source: the US BTS 16:00 · 10.5 min · 564 recorded · 554 measured · Source: the US BTS 17:00 · 3.0 min · 580 recorded · 578 measured · Source: the US BTS 18:00 · 13.5 min · 263 recorded · 262 measured · Source: the US BTS 19:00 · 5.9 min · 863 recorded · 860 measured · Source: the US BTS 20:00 · 9.0 min · 324 recorded · 322 measured · Source: the US BTS 21:00 · 15.4 min · 362 recorded · 360 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 2 recorded · 2 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 · 99 · 99 recorded · 99 measured · Source: the US BTS 06:00 · 1,087 · 1,087 recorded · 1,081 measured · Source: the US BTS 07:00 · 419 · 419 recorded · 417 measured · Source: the US BTS 08:00 · 811 · 811 recorded · 788 measured · Source: the US BTS 09:00 · 95 · 95 recorded · 94 measured · Source: the US BTS 10:00 · 460 · 460 recorded · 455 measured · Source: the US BTS 11:00 · 1,041 · 1,041 recorded · 1,028 measured · Source: the US BTS 12:00 · 591 · 591 recorded · 573 measured · Source: the US BTS 13:00 · 313 · 313 recorded · 309 measured · Source: the US BTS 14:00 · 732 · 732 recorded · 729 measured · Source: the US BTS 15:00 · 527 · 527 recorded · 525 measured · Source: the US BTS 16:00 · 564 · 564 recorded · 554 measured · Source: the US BTS 17:00 · 580 · 580 recorded · 578 measured · Source: the US BTS 18:00 · 263 · 263 recorded · 262 measured · Source: the US BTS 19:00 · 863 · 863 recorded · 860 measured · Source: the US BTS 20:00 · 324 · 324 recorded · 322 measured · Source: the US BTS 21:00 · 362 · 362 recorded · 360 measured · Source: the US BTS 22:00 · 2 · 2 recorded · 2 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.

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———
05:00Fewer than 200 measured departures—9999
06:0095.0%-0.7 min1,0811,087
07:0092.1%-0.1 min417419
08:0091.0%0.6 min788811
09:00Fewer than 200 measured departures—9495
10:0083.5%6.4 min455460
11:0089.4%4.2 min1,0281,041
12:0080.1%8.1 min573591
13:0073.8%12.0 min309313
14:0086.6%3.1 min729732
15:0076.6%8.8 min525527
16:0082.0%10.5 min554564
17:0085.3%3.0 min578580
18:0076.3%13.5 min262263
19:0083.0%5.9 min860863
20:0076.1%9.0 min322324
21:0067.8%15.4 min360362
22:00Fewer than 200 measured departures—22
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 85.2% · 1,417 recorded · 1,400 measured · Source: the US BTS Tuesday · 88.6% · 1,205 recorded · 1,201 measured · Source: the US BTS Wednesday · 87.0% · 1,184 recorded · 1,180 measured · Source: the US BTS Thursday · 81.7% · 1,389 recorded · 1,376 measured · Source: the US BTS Friday · 84.1% · 1,386 recorded · 1,354 measured · Source: the US BTS Saturday · 85.9% · 1,122 recorded · 1,110 measured · Source: the US BTS Sunday · 82.8% · 1,430 recorded · 1,415 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 · 5.8 min · 1,417 recorded · 1,400 measured · Source: the US BTS Tuesday · 2.1 min · 1,205 recorded · 1,201 measured · Source: the US BTS Wednesday · 5.5 min · 1,184 recorded · 1,180 measured · Source: the US BTS Thursday · 7.9 min · 1,389 recorded · 1,376 measured · Source: the US BTS Friday · 5.0 min · 1,386 recorded · 1,354 measured · Source: the US BTS Saturday · 3.5 min · 1,122 recorded · 1,110 measured · Source: the US BTS Sunday · 6.3 min · 1,430 recorded · 1,415 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 · 1,417 · 1,417 recorded · 1,400 measured · Source: the US BTS Tuesday · 1,205 · 1,205 recorded · 1,201 measured · Source: the US BTS Wednesday · 1,184 · 1,184 recorded · 1,180 measured · Source: the US BTS Thursday · 1,389 · 1,389 recorded · 1,376 measured · Source: the US BTS Friday · 1,386 · 1,386 recorded · 1,354 measured · Source: the US BTS Saturday · 1,122 · 1,122 recorded · 1,110 measured · Source: the US BTS Sunday · 1,430 · 1,430 recorded · 1,415 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday85.2%5.8 min1,4001,417
Tuesday88.6%2.1 min1,2011,205
Wednesday87.0%5.5 min1,1801,184
Thursday81.7%7.9 min1,3761,389
Friday84.1%5.0 min1,3541,386
Saturday85.9%3.5 min1,1101,122
Sunday82.8%6.3 min1,4151,430

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 · 83.3% · 648 recorded · 642 measured · Source: the US BTS Feb · 84.3% · 564 recorded · 554 measured · Source: the US BTS Mar · 86.4% · 720 recorded · 714 measured · Source: the US BTS Apr · 90.3% · 804 recorded · 803 measured · Source: the US BTS May · 87.6% · 1,014 recorded · 1,006 measured · Source: the US BTS Jun · 83.1% · 1,013 recorded · 1,003 measured · Source: the US BTS Jul · 77.0% · 1,116 recorded · 1,090 measured · Source: the US BTS Aug · 83.0% · 532 recorded · 529 measured · Source: the US BTS Sep · 89.4% · 426 recorded · 425 measured · Source: the US BTS Oct · 88.5% · 672 recorded · 668 measured · Source: the US BTS Nov · 88.0% · 875 recorded · 859 measured · Source: the US BTS Dec · 81.8% · 749 recorded · 743 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 · 7.9 min · 648 recorded · 642 measured · Source: the US BTS Feb · 4.8 min · 564 recorded · 554 measured · Source: the US BTS Mar · 3.4 min · 720 recorded · 714 measured · Source: the US BTS Apr · 1.7 min · 804 recorded · 803 measured · Source: the US BTS May · 4.5 min · 1,014 recorded · 1,006 measured · Source: the US BTS Jun · 5.2 min · 1,013 recorded · 1,003 measured · Source: the US BTS Jul · 12.1 min · 1,116 recorded · 1,090 measured · Source: the US BTS Aug · 4.4 min · 532 recorded · 529 measured · Source: the US BTS Sep · 2.1 min · 426 recorded · 425 measured · Source: the US BTS Oct · 2.2 min · 672 recorded · 668 measured · Source: the US BTS Nov · 3.4 min · 875 recorded · 859 measured · Source: the US BTS Dec · 7.5 min · 749 recorded · 743 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 · 648 · 648 recorded · 642 measured · Source: the US BTS Feb · 564 · 564 recorded · 554 measured · Source: the US BTS Mar · 720 · 720 recorded · 714 measured · Source: the US BTS Apr · 804 · 804 recorded · 803 measured · Source: the US BTS May · 1,014 · 1,014 recorded · 1,006 measured · Source: the US BTS Jun · 1,013 · 1,013 recorded · 1,003 measured · Source: the US BTS Jul · 1,116 · 1,116 recorded · 1,090 measured · Source: the US BTS Aug · 532 · 532 recorded · 529 measured · Source: the US BTS Sep · 426 · 426 recorded · 425 measured · Source: the US BTS Oct · 672 · 672 recorded · 668 measured · Source: the US BTS Nov · 875 · 875 recorded · 859 measured · Source: the US BTS Dec · 749 · 749 recorded · 743 measured · Source: the US BTS

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

View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan83.3%7.9 min642648
Feb84.3%4.8 min554564
Mar86.4%3.4 min714720
Apr90.3%1.7 min803804
May87.6%4.5 min1,0061,014
Jun83.1%5.2 min1,0031,013
Jul77.0%12.1 min1,0901,116
Aug83.0%4.4 min529532
Sep89.4%2.1 min425426
Oct88.5%2.2 min668672
Nov88.0%3.4 min859875
Dec81.8%7.5 min743749

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 84.0% 7,671
  • Delayed >15 min 14.9% 1,365
  • Cancelled 1.1% 97
  • 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

50
50 of 50
Flight numbersBy direction DeparturesOn time
OO4031 ONT → SEA 597 90.8%
OO4031 SEA → ONT 595 90.2%
OO4042 ONT → SEA 548 95.4%
OO4027 SEA → ONT 540 89.4%
AS1091 ONT → SEA 377 95.5%
AS1254 SEA → ONT 310 88.9%
OO4070 ONT → SEA 300 91.3%
OO4070 SEA → ONT 300 91.0%
AS1086 SEA → ONT 295 69.1%
AS654 ONT → SEA 279 85.5%
F993163 SEA → ONT 277 74.1%
AS1119 ONT → SEA 270 83.4%
AS1364 SEA → ONT 263 90.5%
AS607 ONT → SEA 263 93.9%
F993164 ONT → SEA 249 88.3%
AS592 SEA → ONT 218 72.5%
AS489 SEA → ONT 197 73.5%
AS1111 ONT → SEA 176 80.2%
AS1003 SEA → ONT 170 71.9%
AS1087 ONT → SEA 144 64.3%
AS1097 SEA → ONT 139 84.7%
AS664 SEA → ONT 127 74.4%
AS665 ONT → SEA 125 73.0%
AS1255 ONT → SEA 122 81.7%
AS1040 SEA → ONT 119 60.5%
AS594 ONT → SEA 115 68.7%
AS1118 SEA → ONT 113 74.8%
F992275 ONT → SEA 105 77.9%
OO3884 SEA → ONT 100 86.0%
AS1399 ONT → SEA 99 70.1%
OO4096 SEA → ONT 96 95.7%
OO4096 ONT → SEA 96 95.7%
OO3816 ONT → SEA 86 94.2%
F992276 SEA → ONT 76 84.9%
OO3593 SEA → ONT 66 93.9%
OO3589 SEA → ONT 64 87.5%
OO3589 ONT → SEA 64 82.8%
OO3593 ONT → SEA 64 96.9%
OO3946 ONT → SEA 55 92.7%
OO3946 SEA → ONT 55 94.6%
AS1242 ONT → SEA 50 69.4%
AS1278 SEA → ONT 50 64.6%
AS565 SEA → ONT 46 66.7%
AS567 ONT → SEA 45 72.7%
AS571 SEA → ONT 45 65.9%
AS575 ONT → SEA 45 59.1%
AS1088 SEA → ONT 32 87.5%
OO3840 ONT → SEA 31 100.0%
OO3840 SEA → ONT 31 93.6%
OO3739 SEA → ONT 30 96.7%

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 505 −13.7% 7 76.4%
June 2026 473 −10.8% 7 84.6%
May 2026 494 −3.5% 4 87.2%
April 2026 399 −1.2% 1 91.0%
March 2026 348 −4.9% 6 86.2%
February 2026 270 −4.9% 0 88.5%
January 2026 313 −4.9% 2 83.7%
December 2025 396 +14.1% 4 80.6%
November 2025 408 −9.5% 14 85.5%
October 2025 396 +45.6% 4 87.1%
September 2025 425 1 89.4%
August 2025 529 3 83.0%
July 2025 585 19 77.4%
June 2025 530 3 81.7%
May 2025 512 4 87.9%
April 2025 404 0 89.6%
March 2025 366 0 86.6%
February 2025 284 10 80.3%
January 2025 329 4 83.0%
December 2024 347 2 83.3%
November 2024 451 2 90.2%
October 2024 272 0 90.4%

How to read this chart

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