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3,050 km · Domestic

Hartsfield Jackson Atlanta (ATL) – Ontario (ONT)

In July 2026, 174 flights operated between Hartsfield Jackson Atlanta and Ontario (both directions), and 74.7% 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
January124121▼ 2.4%
February1121120.0%
March123120▼ 2.4%
April153155▲ 1.3%
May162184▲ 13.6%
June164156▼ 4.9%
July1741740.0%
August162––
September154––
October170–in progress
November165––
December168––
Year to date (Jan–Jul)1,0121,022▲ 1.0%

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
January83.9%69.4%▼ 17.3%
February87.5%79.5%▼ 9.1%
March84.6%82.5%▼ 2.5%
April87.6%84.5%▼ 3.5%
May86.4%82.6%▼ 4.4%
June78.0%81.4%▲ 4.4%
July82.8%74.7%▼ 9.8%
August87.7%––
September92.9%––
October87.6%–in progress
November84.8%––
December80.4%––
Year-to-date average (Jan–Jul)84.4%79.2%▼ 6.1%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January880.0%
February00–
March14▲ 300.0%
April10▼ 100.0%
May02–
June440.0%
July220.0%
August2––
September0––
October0–in progress
November3––
December8––
Year to date (Jan–Jul)1620▲ 25.0%

By direction

ATL → ONT

Scheduled flights
1,668
Flights operated
1,644
Cancelled
24 · 1.4%
On-time departures
78.4%

ONT → ATL

Scheduled flights
1,668
Flights operated
1,643
Cancelled
25 · 1.5%
On-time departures
90.0%

ATL → ONT and ONT → ATL counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Delta Air Lines DL 3,336 100.0% 84.2% 49

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 delay07:00–08:002.2min · 541 recorded · 532 measured
Gap to highest-delay hour11.9min07:00 ↔ 20:00
Recorded flights3,336ATL–ONT

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 · 18 recorded · 18 measured · Source: the US BTS 07:00 · 95.7% · 541 recorded · 532 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 105 recorded · 102 measured · Source: the US BTS 09:00 · 88.4% · 505 recorded · 498 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 48 recorded · 47 measured · Source: the US BTS 11:00 · 86.8% · 290 recorded · 287 measured · Source: the US BTS 12:00 · 83.2% · 282 recorded · 280 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 86 recorded · 83 measured · Source: the US BTS 14:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 15:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 85 recorded · 85 measured · Source: the US BTS 17:00 · 79.6% · 277 recorded · 274 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 58 recorded · 56 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 122 recorded · 121 measured · Source: the US BTS 20:00 · 70.7% · 306 recorded · 300 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 162 recorded · 161 measured · Source: the US BTS 22:00 · 91.4% · 451 recorded · 443 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 · 18 recorded · 18 measured · Source: the US BTS 07:00 · 2.2 min · 541 recorded · 532 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 105 recorded · 102 measured · Source: the US BTS 09:00 · 4.4 min · 505 recorded · 498 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 48 recorded · 47 measured · Source: the US BTS 11:00 · 5.2 min · 290 recorded · 287 measured · Source: the US BTS 12:00 · 8.8 min · 282 recorded · 280 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 86 recorded · 83 measured · Source: the US BTS 14:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 15:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 85 recorded · 85 measured · Source: the US BTS 17:00 · 11.6 min · 277 recorded · 274 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 58 recorded · 56 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 122 recorded · 121 measured · Source: the US BTS 20:00 · 14.1 min · 306 recorded · 300 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 162 recorded · 161 measured · Source: the US BTS 22:00 · 5.7 min · 451 recorded · 443 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 · 18 · 18 recorded · 18 measured · Source: the US BTS 07:00 · 541 · 541 recorded · 532 measured · Source: the US BTS 08:00 · 105 · 105 recorded · 102 measured · Source: the US BTS 09:00 · 505 · 505 recorded · 498 measured · Source: the US BTS 10:00 · 48 · 48 recorded · 47 measured · Source: the US BTS 11:00 · 290 · 290 recorded · 287 measured · Source: the US BTS 12:00 · 282 · 282 recorded · 280 measured · Source: the US BTS 13:00 · 86 · 86 recorded · 83 measured · Source: the US BTS 14:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 15:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 16:00 · 85 · 85 recorded · 85 measured · Source: the US BTS 17:00 · 277 · 277 recorded · 274 measured · Source: the US BTS 18:00 · 58 · 58 recorded · 56 measured · Source: the US BTS 19:00 · 122 · 122 recorded · 121 measured · Source: the US BTS 20:00 · 306 · 306 recorded · 300 measured · Source: the US BTS 21:00 · 162 · 162 recorded · 161 measured · Source: the US BTS 22:00 · 451 · 451 recorded · 443 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—1818
07:0095.7%2.2 min532541
08:00Fewer than 200 measured departures—102105
09:0088.4%4.4 min498505
10:00Fewer than 200 measured departures—4748
11:0086.8%5.2 min287290
12:0083.2%8.8 min280282
13:00Fewer than 200 measured departures—8386
14:00No observations———
15:00No observations———
16:00Fewer than 200 measured departures—8585
17:0079.6%11.6 min274277
18:00Fewer than 200 measured departures—5658
19:00Fewer than 200 measured departures—121122
20:0070.7%14.1 min300306
21:00Fewer than 200 measured departures—161162
22:0091.4%5.7 min443451
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 80.1% · 497 recorded · 493 measured · Source: the US BTS Tuesday · 86.8% · 474 recorded · 468 measured · Source: the US BTS Wednesday · 89.3% · 470 recorded · 468 measured · Source: the US BTS Thursday · 85.2% · 490 recorded · 485 measured · Source: the US BTS Friday · 84.4% · 492 recorded · 480 measured · Source: the US BTS Saturday · 84.4% · 416 recorded · 404 measured · Source: the US BTS Sunday · 79.8% · 497 recorded · 489 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 · 8.9 min · 497 recorded · 493 measured · Source: the US BTS Tuesday · 3.7 min · 474 recorded · 468 measured · Source: the US BTS Wednesday · 5.6 min · 470 recorded · 468 measured · Source: the US BTS Thursday · 5.8 min · 490 recorded · 485 measured · Source: the US BTS Friday · 10.1 min · 492 recorded · 480 measured · Source: the US BTS Saturday · 8.0 min · 416 recorded · 404 measured · Source: the US BTS Sunday · 14.0 min · 497 recorded · 489 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 · 497 · 497 recorded · 493 measured · Source: the US BTS Tuesday · 474 · 474 recorded · 468 measured · Source: the US BTS Wednesday · 470 · 470 recorded · 468 measured · Source: the US BTS Thursday · 490 · 490 recorded · 485 measured · Source: the US BTS Friday · 492 · 492 recorded · 480 measured · Source: the US BTS Saturday · 416 · 416 recorded · 404 measured · Source: the US BTS Sunday · 497 · 497 recorded · 489 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
Monday80.1%8.9 min493497
Tuesday86.8%3.7 min468474
Wednesday89.3%5.6 min468470
Thursday85.2%5.8 min485490
Friday84.4%10.1 min480492
Saturday84.4%8.0 min404416
Sunday79.8%14.0 min489497

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 · 76.7% · 261 recorded · 245 measured · Source: the US BTS Feb · 83.5% · 224 recorded · 224 measured · Source: the US BTS Mar · 83.5% · 248 recorded · 243 measured · Source: the US BTS Apr · 86.0% · 309 recorded · 308 measured · Source: the US BTS May · 84.4% · 348 recorded · 346 measured · Source: the US BTS Jun · 79.7% · 328 recorded · 320 measured · Source: the US BTS Jul · 78.7% · 352 recorded · 348 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 164 recorded · 162 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 154 recorded · 154 measured · Source: the US BTS Oct · 88.3% · 274 recorded · 274 measured · Source: the US BTS Nov · 89.3% · 322 recorded · 319 measured · Source: the US BTS Dec · 84.9% · 352 recorded · 344 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 · 20.7 min · 261 recorded · 245 measured · Source: the US BTS Feb · 3.9 min · 224 recorded · 224 measured · Source: the US BTS Mar · 5.2 min · 248 recorded · 243 measured · Source: the US BTS Apr · 6.9 min · 309 recorded · 308 measured · Source: the US BTS May · 6.4 min · 348 recorded · 346 measured · Source: the US BTS Jun · 10.4 min · 328 recorded · 320 measured · Source: the US BTS Jul · 15.4 min · 352 recorded · 348 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 164 recorded · 162 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 154 recorded · 154 measured · Source: the US BTS Oct · 7.1 min · 274 recorded · 274 measured · Source: the US BTS Nov · 4.1 min · 322 recorded · 319 measured · Source: the US BTS Dec · 7.3 min · 352 recorded · 344 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 · 261 · 261 recorded · 245 measured · Source: the US BTS Feb · 224 · 224 recorded · 224 measured · Source: the US BTS Mar · 248 · 248 recorded · 243 measured · Source: the US BTS Apr · 309 · 309 recorded · 308 measured · Source: the US BTS May · 348 · 348 recorded · 346 measured · Source: the US BTS Jun · 328 · 328 recorded · 320 measured · Source: the US BTS Jul · 352 · 352 recorded · 348 measured · Source: the US BTS Aug · 164 · 164 recorded · 162 measured · Source: the US BTS Sep · 154 · 154 recorded · 154 measured · Source: the US BTS Oct · 274 · 274 recorded · 274 measured · Source: the US BTS Nov · 322 · 322 recorded · 319 measured · Source: the US BTS Dec · 352 · 352 recorded · 344 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan76.7%20.7 min245261
Feb83.5%3.9 min224224
Mar83.5%5.2 min243248
Apr86.0%6.9 min308309
May84.4%6.4 min346348
Jun79.7%10.4 min320328
Jul78.7%15.4 min348352
AugFewer than 200 measured departures—162164
SepFewer than 200 measured departures—154154
Oct88.3%7.1 min274274
Nov89.3%4.1 min319322
Dec84.9%7.3 min344352

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 83.0% 2,768
  • Delayed >15 min 15.6% 519
  • Cancelled 1.5% 49
  • 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

11
11 of 11
Flight numbersBy direction DeparturesOn time
DL665 ONT → ATL 658 84.3%
DL665 ATL → ONT 658 89.2%
DL761 ONT → ATL 657 93.2%
DL779 ATL → ONT 531 69.2%
DL770 ATL → ONT 310 78.7%
DL828 ONT → ATL 258 95.7%
DL2891 ATL → ONT 78 62.8%
DL761 ATL → ONT 60 75.0%
DL2892 ONT → ATL 40 94.9%
DL2891 ONT → ATL 31 96.8%
DL745 ATL → ONT 31 51.6%

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 174 +0.0% 2 74.7%
June 2026 156 −4.9% 4 81.4%
May 2026 184 +13.6% 2 82.6%
April 2026 155 +1.3% 0 84.5%
March 2026 120 −2.4% 4 82.5%
February 2026 112 +0.0% 0 79.5%
January 2026 121 −2.4% 8 69.4%
December 2025 168 −4.5% 8 80.4%
November 2025 165 +7.1% 3 84.8%
October 2025 170 +63.5% 0 87.6%
September 2025 154 0 92.9%
August 2025 162 2 87.7%
July 2025 174 2 82.8%
June 2025 164 4 78.0%
May 2025 162 0 86.4%
April 2025 153 1 87.6%
March 2025 123 1 84.6%
February 2025 112 0 87.5%
January 2025 124 8 83.9%
December 2024 176 0 89.2%
November 2024 154 0 94.2%
October 2024 104 0 89.4%

How to read this chart

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