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3,237 km · Domestic

John Glenn Columbus (CMH) – Seattle–Tacoma (SEA)

In July 2026, 122 flights operated between John Glenn Columbus and Seattle–Tacoma (both directions), and 72.1% 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
January4743▼ 8.5%
February4440▼ 9.1%
March5651▼ 8.9%
April59590.0%
May9789▼ 8.2%
June120114▼ 5.0%
July121122▲ 0.8%
August114––
September103––
October66–in progress
November58––
December62––
Year to date (Jan–Jul)544518▼ 4.8%

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
January91.5%69.8%▼ 23.7%
February81.8%87.5%▲ 7.0%
March76.8%78.4%▲ 2.1%
April79.7%86.4%▲ 8.4%
May76.3%65.2%▼ 14.5%
June75.0%76.3%▲ 1.7%
July64.5%72.1%▲ 11.8%
August72.8%––
September81.6%––
October81.8%–in progress
November84.5%––
December59.7%––
Year-to-date average (Jan–Jul)77.9%76.5%▼ 1.8%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January04–
February01–
March01–
April110.0%
May00–
June00–
July10▼ 100.0%
August0––
September0––
October0–in progress
November0––
December0––
Year to date (Jan–Jul)27▲ 250.0%

Airlines on this route

  1. Alaska Airlines 99.5%
  2. American Airlines 0.1%
  3. Delta Air Lines 0.1%
  4. Southwest Airlines 0.1%
  5. United Airlines 0.1%

Oct 1, 2024 – Jul 31, 2026

By direction

CMH → SEA

Scheduled flights
815
Flights operated
807
Cancelled
8 · 1.0%
On-time departures
74.5%

SEA → CMH

Scheduled flights
815
Flights operated
812
Cancelled
3 · 0.4%
On-time departures
79.6%

CMH → SEA and SEA → CMH counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Alaska Airlines AS 1,622 99.5% 77.0% 11
American Airlines AA 2 0.1% 100.0% 0
Delta Air Lines DL 2 0.1% 100.0% 0
Southwest Airlines WN 2 0.1% 50.0% 0
United Airlines UA 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 delay10:00–11:006.7min · 305 recorded · 305 measured
Gap to highest-delay hour8.7min10:00 ↔ 18:00
Recorded flights1,630CMH–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 · Fewer than 200 measured departures · 23 recorded · 23 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 186 recorded · 185 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 54 recorded · 50 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 199 recorded · 199 measured · Source: the US BTS 10:00 · 82.6% · 305 recorded · 305 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 91 recorded · 89 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 26 recorded · 25 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 57 recorded · 57 measured · Source: the US BTS 15:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 16:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 18:00 · 65.9% · 416 recorded · 414 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 77 recorded · 76 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 123 recorded · 123 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 71 recorded · 71 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 · Fewer than 200 measured departures · 23 recorded · 23 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 186 recorded · 185 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 54 recorded · 50 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 199 recorded · 199 measured · Source: the US BTS 10:00 · 6.7 min · 305 recorded · 305 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 91 recorded · 89 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 26 recorded · 25 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 57 recorded · 57 measured · Source: the US BTS 15:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 16:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 18:00 · 15.4 min · 416 recorded · 414 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 77 recorded · 76 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 123 recorded · 123 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 71 recorded · 71 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 · 23 · 23 recorded · 23 measured · Source: the US BTS 07:00 · 186 · 186 recorded · 185 measured · Source: the US BTS 08:00 · 54 · 54 recorded · 50 measured · Source: the US BTS 09:00 · 199 · 199 recorded · 199 measured · Source: the US BTS 10:00 · 305 · 305 recorded · 305 measured · Source: the US BTS 11:00 · 91 · 91 recorded · 89 measured · Source: the US BTS 12:00 · 1 · 1 recorded · 1 measured · Source: the US BTS 13:00 · 26 · 26 recorded · 25 measured · Source: the US BTS 14:00 · 57 · 57 recorded · 57 measured · Source: the US BTS 15:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 16:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 17:00 · 1 · 1 recorded · 1 measured · Source: the US BTS 18:00 · 416 · 416 recorded · 414 measured · Source: the US BTS 19:00 · 77 · 77 recorded · 76 measured · Source: the US BTS 20:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 21:00 · 123 · 123 recorded · 123 measured · Source: the US BTS 22:00 · 71 · 71 recorded · 71 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———
06:00Fewer than 200 measured departures—2323
07:00Fewer than 200 measured departures—185186
08:00Fewer than 200 measured departures—5054
09:00Fewer than 200 measured departures—199199
10:0082.6%6.7 min305305
11:00Fewer than 200 measured departures—8991
12:00Fewer than 200 measured departures—11
13:00Fewer than 200 measured departures—2526
14:00Fewer than 200 measured departures—5757
15:00No observations———
16:00No observations———
17:00Fewer than 200 measured departures—11
18:0065.9%15.4 min414416
19:00Fewer than 200 measured departures—7677
20:00No observations———
21:00Fewer than 200 measured departures—123123
22:00Fewer than 200 measured departures—7171
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 75.8% · 250 recorded · 248 measured · Source: the US BTS Tuesday · Fewer than 200 measured departures · 187 recorded · 187 measured · Source: the US BTS Wednesday · 76.9% · 240 recorded · 238 measured · Source: the US BTS Thursday · 76.4% · 246 recorded · 246 measured · Source: the US BTS Friday · 76.3% · 255 recorded · 253 measured · Source: the US BTS Saturday · Fewer than 200 measured departures · 199 recorded · 197 measured · Source: the US BTS Sunday · 77.6% · 253 recorded · 250 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 · 8.5 min · 250 recorded · 248 measured · Source: the US BTS Tuesday · Fewer than 200 measured departures · 187 recorded · 187 measured · Source: the US BTS Wednesday · 7.6 min · 240 recorded · 238 measured · Source: the US BTS Thursday · 7.9 min · 246 recorded · 246 measured · Source: the US BTS Friday · 13.0 min · 255 recorded · 253 measured · Source: the US BTS Saturday · Fewer than 200 measured departures · 199 recorded · 197 measured · Source: the US BTS Sunday · 10.3 min · 253 recorded · 250 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 · 250 · 250 recorded · 248 measured · Source: the US BTS Tuesday · 187 · 187 recorded · 187 measured · Source: the US BTS Wednesday · 240 · 240 recorded · 238 measured · Source: the US BTS Thursday · 246 · 246 recorded · 246 measured · Source: the US BTS Friday · 255 · 255 recorded · 253 measured · Source: the US BTS Saturday · 199 · 199 recorded · 197 measured · Source: the US BTS Sunday · 253 · 253 recorded · 250 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday75.8%8.5 min248250
TuesdayFewer than 200 measured departures—187187
Wednesday76.9%7.6 min238240
Thursday76.4%7.9 min246246
Friday76.3%13.0 min253255
SaturdayFewer than 200 measured departures—197199
Sunday77.6%10.3 min250253

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 · 94 recorded · 90 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 85 recorded · 84 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 108 recorded · 107 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 120 recorded · 118 measured · Source: the US BTS May · Fewer than 200 measured departures · 186 recorded · 186 measured · Source: the US BTS Jun · 75.6% · 234 recorded · 234 measured · Source: the US BTS Jul · 68.3% · 244 recorded · 243 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 114 recorded · 114 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 103 recorded · 103 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 106 recorded · 106 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 118 recorded · 116 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 118 recorded · 118 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 · 94 recorded · 90 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 85 recorded · 84 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 108 recorded · 107 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 120 recorded · 118 measured · Source: the US BTS May · Fewer than 200 measured departures · 186 recorded · 186 measured · Source: the US BTS Jun · 8.7 min · 234 recorded · 234 measured · Source: the US BTS Jul · 12.6 min · 244 recorded · 243 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 114 recorded · 114 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 103 recorded · 103 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 106 recorded · 106 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 118 recorded · 116 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 118 recorded · 118 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 · 94 · 94 recorded · 90 measured · Source: the US BTS Feb · 85 · 85 recorded · 84 measured · Source: the US BTS Mar · 108 · 108 recorded · 107 measured · Source: the US BTS Apr · 120 · 120 recorded · 118 measured · Source: the US BTS May · 186 · 186 recorded · 186 measured · Source: the US BTS Jun · 234 · 234 recorded · 234 measured · Source: the US BTS Jul · 244 · 244 recorded · 243 measured · Source: the US BTS Aug · 114 · 114 recorded · 114 measured · Source: the US BTS Sep · 103 · 103 recorded · 103 measured · Source: the US BTS Oct · 106 · 106 recorded · 106 measured · Source: the US BTS Nov · 118 · 118 recorded · 116 measured · Source: the US BTS Dec · 118 · 118 recorded · 118 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
JanFewer than 200 measured departures—9094
FebFewer than 200 measured departures—8485
MarFewer than 200 measured departures—107108
AprFewer than 200 measured departures—118120
MayFewer than 200 measured departures—186186
Jun75.6%8.7 min234234
Jul68.3%12.6 min243244
AugFewer than 200 measured departures—114114
SepFewer than 200 measured departures—103103
OctFewer than 200 measured departures—106106
NovFewer than 200 measured departures—116118
DecFewer than 200 measured departures—118118

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 76.5% 1,247
  • Delayed >15 min 22.8% 372
  • Cancelled 0.7% 11
  • 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

7
Flight numbersBy direction DeparturesOn time
AS450 SEA → CMH 588 81.5%
AS450 CMH → SEA 374 65.3%
AS345 CMH → SEA 201 86.4%
AS316 CMH → SEA 101 82.0%
AS315 SEA → CMH 93 63.4%
AS283 CMH → SEA 52 73.1%
AS280 SEA → CMH 51 78.4%

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 122 +0.8% 0 72.1%
June 2026 114 −5.0% 0 76.3%
May 2026 89 −8.2% 0 65.2%
April 2026 59 +0.0% 1 86.4%
March 2026 51 −8.9% 1 78.4%
February 2026 40 −9.1% 1 87.5%
January 2026 43 −8.5% 4 69.8%
December 2025 62 +10.7% 0 59.7%
November 2025 58 +0.0% 0 84.5%
October 2025 66 +65.0% 0 81.8%
September 2025 103 0 81.6%
August 2025 114 0 72.8%
July 2025 121 1 64.5%
June 2025 120 0 75.0%
May 2025 97 0 76.3%
April 2025 59 1 79.7%
March 2025 56 0 76.8%
February 2025 44 0 81.8%
January 2025 47 0 91.5%
December 2024 56 0 87.5%
November 2024 58 2 94.8%
October 2024 40 0 90.0%

How to read this chart

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