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1,107 km · Domestic

Seattle–Tacoma (SEA) – Salt Lake City (SLC)

In July 2026, 820 flights operated between Seattle–Tacoma and Salt Lake City (both directions), and 77.2% 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
January639599▼ 6.3%
February555585▲ 5.4%
March610646▲ 5.9%
April612628▲ 2.6%
May719674▼ 6.3%
June740717▼ 3.1%
July780820▲ 5.1%
August808––
September794––
October722–in progress
November579––
December605––
Year to date (Jan–Jul)4,6554,669▲ 0.3%

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
January87.0%85.1%▼ 2.2%
February85.6%84.3%▼ 1.5%
March84.3%84.1%▼ 0.2%
April86.1%91.4%▲ 6.2%
May82.1%84.3%▲ 2.7%
June76.8%82.3%▲ 7.2%
July78.3%77.2%▼ 1.4%
August80.2%––
September89.5%––
October83.4%–in progress
November86.4%––
December73.9%––
Year-to-date average (Jan–Jul)82.9%84.1%▲ 1.5%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January01–
February62▼ 66.7%
March223▲ 1,050.0%
April110.0%
May220.0%
June40▼ 100.0%
July82▼ 75.0%
August9––
September2––
October10–in progress
November17––
December3––
Year to date (Jan–Jul)2331▲ 34.8%

Airlines on this route

  1. Delta Air Lines 55.1%
  2. Alaska Airlines 31.9%
  3. SkyWest Airlines 10.4%
  4. Frontier Airlines 2.6%

Oct 1, 2024 – Jul 31, 2026

By direction

SEA → SLC

Scheduled flights
7,297
Flights operated
7,248
Cancelled
49 · 0.7%
On-time departures
83.4%

SLC → SEA

Scheduled flights
7,300
Flights operated
7,248
Cancelled
52 · 0.7%
On-time departures
84.2%

SEA → SLC and SLC → SEA counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Delta Air Lines DL 8,046 55.1% 86.5% 30
Alaska Airlines AS 4,651 31.9% 78.9% 63
SkyWest Airlines OO 1,519 10.4% 85.2% 1
Frontier Airlines F9 381 2.6% 80.7% 7

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 delay06:00–07:00-0.8min · 353 recorded · 351 measured
Gap to highest-delay hour13.8min06:00 ↔ 20:00
Recorded flights14,597SEA–SLC

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 · 95.4% · 677 recorded · 675 measured · Source: the US BTS 06:00 · 94.0% · 353 recorded · 351 measured · Source: the US BTS 07:00 · 93.9% · 1,492 recorded · 1,485 measured · Source: the US BTS 08:00 · 92.2% · 526 recorded · 522 measured · Source: the US BTS 09:00 · 87.7% · 1,230 recorded · 1,223 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 173 recorded · 172 measured · Source: the US BTS 11:00 · 83.2% · 1,857 recorded · 1,845 measured · Source: the US BTS 12:00 · 82.8% · 274 recorded · 273 measured · Source: the US BTS 13:00 · 82.5% · 1,372 recorded · 1,362 measured · Source: the US BTS 14:00 · 80.4% · 249 recorded · 245 measured · Source: the US BTS 15:00 · 76.2% · 1,256 recorded · 1,243 measured · Source: the US BTS 16:00 · 75.0% · 629 recorded · 621 measured · Source: the US BTS 17:00 · 81.3% · 1,408 recorded · 1,402 measured · Source: the US BTS 18:00 · 80.0% · 476 recorded · 470 measured · Source: the US BTS 19:00 · 78.0% · 1,008 recorded · 1,001 measured · Source: the US BTS 20:00 · 73.9% · 755 recorded · 746 measured · Source: the US BTS 21:00 · 81.1% · 399 recorded · 397 measured · Source: the US BTS 22:00 · 85.8% · 388 recorded · 388 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 75 recorded · 75 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 · 0.7 min · 677 recorded · 675 measured · Source: the US BTS 06:00 · -0.8 min · 353 recorded · 351 measured · Source: the US BTS 07:00 · 1.4 min · 1,492 recorded · 1,485 measured · Source: the US BTS 08:00 · 1.7 min · 526 recorded · 522 measured · Source: the US BTS 09:00 · 5.4 min · 1,230 recorded · 1,223 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 173 recorded · 172 measured · Source: the US BTS 11:00 · 7.7 min · 1,857 recorded · 1,845 measured · Source: the US BTS 12:00 · 7.7 min · 274 recorded · 273 measured · Source: the US BTS 13:00 · 8.1 min · 1,372 recorded · 1,362 measured · Source: the US BTS 14:00 · 8.0 min · 249 recorded · 245 measured · Source: the US BTS 15:00 · 10.7 min · 1,256 recorded · 1,243 measured · Source: the US BTS 16:00 · 11.9 min · 629 recorded · 621 measured · Source: the US BTS 17:00 · 8.5 min · 1,408 recorded · 1,402 measured · Source: the US BTS 18:00 · 9.3 min · 476 recorded · 470 measured · Source: the US BTS 19:00 · 9.7 min · 1,008 recorded · 1,001 measured · Source: the US BTS 20:00 · 13.0 min · 755 recorded · 746 measured · Source: the US BTS 21:00 · 5.6 min · 399 recorded · 397 measured · Source: the US BTS 22:00 · 5.7 min · 388 recorded · 388 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 75 recorded · 75 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 · 677 · 677 recorded · 675 measured · Source: the US BTS 06:00 · 353 · 353 recorded · 351 measured · Source: the US BTS 07:00 · 1,492 · 1,492 recorded · 1,485 measured · Source: the US BTS 08:00 · 526 · 526 recorded · 522 measured · Source: the US BTS 09:00 · 1,230 · 1,230 recorded · 1,223 measured · Source: the US BTS 10:00 · 173 · 173 recorded · 172 measured · Source: the US BTS 11:00 · 1,857 · 1,857 recorded · 1,845 measured · Source: the US BTS 12:00 · 274 · 274 recorded · 273 measured · Source: the US BTS 13:00 · 1,372 · 1,372 recorded · 1,362 measured · Source: the US BTS 14:00 · 249 · 249 recorded · 245 measured · Source: the US BTS 15:00 · 1,256 · 1,256 recorded · 1,243 measured · Source: the US BTS 16:00 · 629 · 629 recorded · 621 measured · Source: the US BTS 17:00 · 1,408 · 1,408 recorded · 1,402 measured · Source: the US BTS 18:00 · 476 · 476 recorded · 470 measured · Source: the US BTS 19:00 · 1,008 · 1,008 recorded · 1,001 measured · Source: the US BTS 20:00 · 755 · 755 recorded · 746 measured · Source: the US BTS 21:00 · 399 · 399 recorded · 397 measured · Source: the US BTS 22:00 · 388 · 388 recorded · 388 measured · Source: the US BTS 23:00 · 75 · 75 recorded · 75 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———
05:0095.4%0.7 min675677
06:0094.0%-0.8 min351353
07:0093.9%1.4 min1,4851,492
08:0092.2%1.7 min522526
09:0087.7%5.4 min1,2231,230
10:00Fewer than 200 measured departures—172173
11:0083.2%7.7 min1,8451,857
12:0082.8%7.7 min273274
13:0082.5%8.1 min1,3621,372
14:0080.4%8.0 min245249
15:0076.2%10.7 min1,2431,256
16:0075.0%11.9 min621629
17:0081.3%8.5 min1,4021,408
18:0080.0%9.3 min470476
19:0078.0%9.7 min1,0011,008
20:0073.9%13.0 min746755
21:0081.1%5.6 min397399
22:0085.8%5.7 min388388
23:00Fewer than 200 measured departures—7575

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 83.9% · 2,264 recorded · 2,244 measured · Source: the US BTS Tuesday · 87.2% · 1,948 recorded · 1,945 measured · Source: the US BTS Wednesday · 85.5% · 1,964 recorded · 1,959 measured · Source: the US BTS Thursday · 82.5% · 2,195 recorded · 2,175 measured · Source: the US BTS Friday · 83.4% · 2,224 recorded · 2,196 measured · Source: the US BTS Saturday · 82.7% · 1,825 recorded · 1,812 measured · Source: the US BTS Sunday · 81.9% · 2,177 recorded · 2,165 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 · 7.7 min · 2,264 recorded · 2,244 measured · Source: the US BTS Tuesday · 4.5 min · 1,948 recorded · 1,945 measured · Source: the US BTS Wednesday · 5.5 min · 1,964 recorded · 1,959 measured · Source: the US BTS Thursday · 7.4 min · 2,195 recorded · 2,175 measured · Source: the US BTS Friday · 6.8 min · 2,224 recorded · 2,196 measured · Source: the US BTS Saturday · 6.9 min · 1,825 recorded · 1,812 measured · Source: the US BTS Sunday · 8.9 min · 2,177 recorded · 2,165 measured · Source: the US BTS

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Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 2,264 · 2,264 recorded · 2,244 measured · Source: the US BTS Tuesday · 1,948 · 1,948 recorded · 1,945 measured · Source: the US BTS Wednesday · 1,964 · 1,964 recorded · 1,959 measured · Source: the US BTS Thursday · 2,195 · 2,195 recorded · 2,175 measured · Source: the US BTS Friday · 2,224 · 2,224 recorded · 2,196 measured · Source: the US BTS Saturday · 1,825 · 1,825 recorded · 1,812 measured · Source: the US BTS Sunday · 2,177 · 2,177 recorded · 2,165 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday83.9%7.7 min2,2442,264
Tuesday87.2%4.5 min1,9451,948
Wednesday85.5%5.5 min1,9591,964
Thursday82.5%7.4 min2,1752,195
Friday83.4%6.8 min2,1962,224
Saturday82.7%6.9 min1,8121,825
Sunday81.9%8.9 min2,1652,177

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 · 86.1% · 1,239 recorded · 1,238 measured · Source: the US BTS Feb · 84.9% · 1,148 recorded · 1,140 measured · Source: the US BTS Mar · 84.2% · 1,281 recorded · 1,256 measured · Source: the US BTS Apr · 88.8% · 1,242 recorded · 1,240 measured · Source: the US BTS May · 83.1% · 1,397 recorded · 1,393 measured · Source: the US BTS Jun · 79.5% · 1,461 recorded · 1,457 measured · Source: the US BTS Jul · 77.8% · 1,610 recorded · 1,600 measured · Source: the US BTS Aug · 80.2% · 817 recorded · 808 measured · Source: the US BTS Sep · 89.6% · 796 recorded · 794 measured · Source: the US BTS Oct · 85.6% · 1,160 recorded · 1,148 measured · Source: the US BTS Nov · 89.0% · 1,231 recorded · 1,211 measured · Source: the US BTS Dec · 80.6% · 1,215 recorded · 1,211 measured · Source: the US BTS

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Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Jan · 5.0 min · 1,239 recorded · 1,238 measured · Source: the US BTS Feb · 5.7 min · 1,148 recorded · 1,140 measured · Source: the US BTS Mar · 6.5 min · 1,281 recorded · 1,256 measured · Source: the US BTS Apr · 2.7 min · 1,242 recorded · 1,240 measured · Source: the US BTS May · 6.5 min · 1,397 recorded · 1,393 measured · Source: the US BTS Jun · 11.2 min · 1,461 recorded · 1,457 measured · Source: the US BTS Jul · 11.5 min · 1,610 recorded · 1,600 measured · Source: the US BTS Aug · 9.4 min · 817 recorded · 808 measured · Source: the US BTS Sep · 2.9 min · 796 recorded · 794 measured · Source: the US BTS Oct · 4.9 min · 1,160 recorded · 1,148 measured · Source: the US BTS Nov · 3.2 min · 1,231 recorded · 1,211 measured · Source: the US BTS Dec · 10.0 min · 1,215 recorded · 1,211 measured · Source: the US BTS

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Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 1,239 · 1,239 recorded · 1,238 measured · Source: the US BTS Feb · 1,148 · 1,148 recorded · 1,140 measured · Source: the US BTS Mar · 1,281 · 1,281 recorded · 1,256 measured · Source: the US BTS Apr · 1,242 · 1,242 recorded · 1,240 measured · Source: the US BTS May · 1,397 · 1,397 recorded · 1,393 measured · Source: the US BTS Jun · 1,461 · 1,461 recorded · 1,457 measured · Source: the US BTS Jul · 1,610 · 1,610 recorded · 1,600 measured · Source: the US BTS Aug · 817 · 817 recorded · 808 measured · Source: the US BTS Sep · 796 · 796 recorded · 794 measured · Source: the US BTS Oct · 1,160 · 1,160 recorded · 1,148 measured · Source: the US BTS Nov · 1,231 · 1,231 recorded · 1,211 measured · Source: the US BTS Dec · 1,215 · 1,215 recorded · 1,211 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan86.1%5.0 min1,2381,239
Feb84.9%5.7 min1,1401,148
Mar84.2%6.5 min1,2561,281
Apr88.8%2.7 min1,2401,242
May83.1%6.5 min1,3931,397
Jun79.5%11.2 min1,4571,461
Jul77.8%11.5 min1,6001,610
Aug80.2%9.4 min808817
Sep89.6%2.9 min794796
Oct85.6%4.9 min1,1481,160
Nov89.0%3.2 min1,2111,231
Dec80.6%10.0 min1,2111,215

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 83.2% 12,148
  • Delayed >15 min 16.1% 2,348
  • Cancelled 0.7% 101
  • 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

70
70 of 70
Flight numbersBy direction DeparturesOn time
DL1120 SEA → SLC 658 82.3%
DL1128 SEA → SLC 658 95.9%
DL2874 SLC → SEA 658 93.6%
DL2995 SLC → SEA 658 89.3%
DL1016 SEA → SLC 656 91.0%
DL2817 SLC → SEA 656 82.6%
DL871 SLC → SEA 604 81.9%
DL1165 SEA → SLC 594 79.9%
DL2998 SLC → SEA 521 85.0%
DL1265 SEA → SLC 489 86.0%
DL1239 SEA → SLC 463 81.4%
OO3298 SEA → SLC 406 78.6%
AS796 SLC → SEA 373 87.3%
DL2921 SLC → SEA 373 86.3%
AS734 SLC → SEA 326 69.0%
AS733 SEA → SLC 321 66.8%
AS430 SEA → SLC 294 93.1%
AS630 SEA → SLC 257 85.4%
AS510 SLC → SEA 245 74.9%
DL2823 SLC → SEA 240 76.6%
AS631 SLC → SEA 236 81.6%
AS719 SLC → SEA 228 76.6%
OO3344 SLC → SEA 222 92.8%
F994987 SLC → SEA 191 84.0%
F994988 SEA → SLC 190 77.5%
DL2816 SEA → SLC 186 92.5%
AS518 SEA → SLC 177 82.3%
OO3381 SLC → SEA 166 83.7%
AS715 SLC → SEA 138 77.2%
AS653 SLC → SEA 127 92.1%
AS1125 SEA → SLC 116 75.7%
AS720 SEA → SLC 111 70.0%
AS628 SEA → SLC 107 71.4%
OO3364 SLC → SEA 106 94.3%
AS669 SEA → SLC 104 80.8%
OO3308 SEA → SLC 104 82.7%
DL2060 SLC → SEA 98 93.9%
AS614 SEA → SLC 94 82.8%
OO3480 SLC → SEA 90 93.3%
DL2016 SLC → SEA 86 57.7%
DL2858 SEA → SLC 86 96.5%
OO3445 SEA → SLC 69 78.3%
AS509 SEA → SLC 68 68.8%
DL1114 SEA → SLC 68 97.1%
AS1126 SLC → SEA 67 74.6%
AS796 SEA → SLC 65 84.6%
AS670 SLC → SEA 64 76.2%
DL2132 SEA → SLC 62 91.9%
AS677 SEA → SLC 61 78.3%
AS627 SLC → SEA 59 87.9%
OO3295 SLC → SEA 56 96.4%
AS292 SEA → SLC 52 86.5%
AS360 SEA → SLC 52 84.6%
AS664 SLC → SEA 52 78.9%
AS373 SEA → SLC 51 80.4%
AS652 SEA → SLC 51 84.3%
AS678 SLC → SEA 51 85.7%
OO3331 SEA → SLC 45 84.4%
AS795 SEA → SLC 44 84.1%
AS1444 SLC → SEA 39 94.9%
AS368 SEA → SLC 38 60.5%
AS1320 SLC → SEA 37 67.6%
AS665 SLC → SEA 37 54.1%
DL3200 SLC → SEA 37 100.0%
DL1127 SEA → SLC 36 88.9%
AS1450 SLC → SEA 34 96.9%
AS1451 SEA → SLC 34 69.7%
OO3481 SEA → SLC 34 73.5%
AS594 SEA → SLC 33 68.8%
AS1395 SLC → SEA 31 90.3%

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 820 +5.1% 2 77.2%
June 2026 717 −3.1% 0 82.3%
May 2026 674 −6.3% 2 84.3%
April 2026 628 +2.6% 1 91.4%
March 2026 646 +5.9% 23 84.1%
February 2026 585 +5.4% 2 84.3%
January 2026 599 −6.3% 1 85.1%
December 2025 605 −0.2% 3 73.9%
November 2025 579 −8.4% 17 86.4%
October 2025 722 +69.5% 10 83.4%
September 2025 794 2 89.5%
August 2025 808 9 80.2%
July 2025 780 8 78.3%
June 2025 740 4 76.8%
May 2025 719 2 82.1%
April 2025 612 1 86.1%
March 2025 610 2 84.3%
February 2025 555 6 85.6%
January 2025 639 0 87.0%
December 2024 606 1 87.3%
November 2024 632 3 91.5%
October 2024 426 2 89.4%

How to read this chart

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