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462 km · Domestic

Chicago O'Hare (ORD) – Louisville Muhammad Ali (SDF)

In July 2026, 476 flights operated between Chicago O'Hare and Louisville Muhammad Ali (both directions), and 84.2% 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
January297350▲ 17.8%
February296394▲ 33.1%
March338413▲ 22.2%
April443597▲ 34.8%
May426610▲ 43.2%
June447436▼ 2.5%
July506476▼ 5.9%
August468––
September442––
October512–in progress
November359––
December352––
Year to date (Jan–Jul)2,7533,276▲ 19.0%

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
January83.8%74.9%▼ 10.6%
February81.1%81.5%▲ 0.5%
March85.2%78.0%▼ 8.5%
April84.7%81.6%▼ 3.7%
May90.1%83.1%▼ 7.8%
June81.0%81.0%0.0%
July72.5%84.2%▲ 16.1%
August85.9%––
September89.8%––
October87.7%–in progress
November83.3%––
December75.3%––
Year-to-date average (Jan–Jul)82.6%80.6%▼ 2.4%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January1913▼ 31.6%
February42▼ 50.0%
March727▲ 285.7%
April626▲ 333.3%
May213▲ 550.0%
June126▲ 2,500.0%
July1220▲ 66.7%
August16––
September2––
October0–in progress
November29––
December6––
Year to date (Jan–Jul)51127▲ 149.0%

Airlines on this route

  1. Republic Airways 62.0%
  2. SkyWest Airlines 21.4%
  3. Envoy Air 16.2%
  4. United Airlines 0.2%
  5. American Airlines 0.2%
  6. PSA Airlines 0.0%

Oct 1, 2024 – Jul 31, 2026

By direction

ORD → SDF

Scheduled flights
4,724
Flights operated
4,599
Cancelled
125 · 2.6%
On-time departures
80.6%

SDF → ORD

Scheduled flights
4,729
Flights operated
4,623
Cancelled
106 · 2.2%
On-time departures
85.7%

ORD → SDF and SDF → ORD counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Republic Airways YX 5,861 62.0% 85.2% 145
SkyWest Airlines OO 2,020 21.4% 76.5% 64
Envoy Air MQ 1,534 16.2% 84.3% 20
United Airlines UA 19 0.2% 68.4% 0
American Airlines AA 17 0.2% 64.7% 0
PSA Airlines OH 2 0.0% 2

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 delay08:00–09:000.3min · 519 recorded · 516 measured
Gap to highest-delay hour18.9min08:00 ↔ 13:00
Recorded flights9,453ORD–SDF

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 · 202 recorded · 199 measured · Source: the US BTS 06:00 · 90.7% · 597 recorded · 588 measured · Source: the US BTS 07:00 · 91.9% · 1,036 recorded · 1,022 measured · Source: the US BTS 08:00 · 93.8% · 519 recorded · 516 measured · Source: the US BTS 09:00 · 88.6% · 466 recorded · 457 measured · Source: the US BTS 10:00 · 81.5% · 799 recorded · 791 measured · Source: the US BTS 11:00 · 89.5% · 556 recorded · 550 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 132 recorded · 128 measured · Source: the US BTS 13:00 · 75.2% · 224 recorded · 218 measured · Source: the US BTS 14:00 · 77.4% · 1,096 recorded · 1,077 measured · Source: the US BTS 15:00 · 73.3% · 234 recorded · 228 measured · Source: the US BTS 16:00 · 82.0% · 301 recorded · 289 measured · Source: the US BTS 17:00 · 79.0% · 872 recorded · 846 measured · Source: the US BTS 18:00 · 81.2% · 859 recorded · 817 measured · Source: the US BTS 19:00 · 77.6% · 909 recorded · 878 measured · Source: the US BTS 20:00 · 74.4% · 480 recorded · 465 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 169 recorded · 153 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 1 recorded · 0 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 1 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 · 202 recorded · 199 measured · Source: the US BTS 06:00 · 1.9 min · 597 recorded · 588 measured · Source: the US BTS 07:00 · 0.8 min · 1,036 recorded · 1,022 measured · Source: the US BTS 08:00 · 0.3 min · 519 recorded · 516 measured · Source: the US BTS 09:00 · 5.8 min · 466 recorded · 457 measured · Source: the US BTS 10:00 · 12.2 min · 799 recorded · 791 measured · Source: the US BTS 11:00 · 2.6 min · 556 recorded · 550 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 132 recorded · 128 measured · Source: the US BTS 13:00 · 19.2 min · 224 recorded · 218 measured · Source: the US BTS 14:00 · 16.4 min · 1,096 recorded · 1,077 measured · Source: the US BTS 15:00 · 14.6 min · 234 recorded · 228 measured · Source: the US BTS 16:00 · 8.5 min · 301 recorded · 289 measured · Source: the US BTS 17:00 · 16.0 min · 872 recorded · 846 measured · Source: the US BTS 18:00 · 11.6 min · 859 recorded · 817 measured · Source: the US BTS 19:00 · 17.5 min · 909 recorded · 878 measured · Source: the US BTS 20:00 · 15.5 min · 480 recorded · 465 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 169 recorded · 153 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 1 recorded · 0 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 1 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 · 202 · 202 recorded · 199 measured · Source: the US BTS 06:00 · 597 · 597 recorded · 588 measured · Source: the US BTS 07:00 · 1,036 · 1,036 recorded · 1,022 measured · Source: the US BTS 08:00 · 519 · 519 recorded · 516 measured · Source: the US BTS 09:00 · 466 · 466 recorded · 457 measured · Source: the US BTS 10:00 · 799 · 799 recorded · 791 measured · Source: the US BTS 11:00 · 556 · 556 recorded · 550 measured · Source: the US BTS 12:00 · 132 · 132 recorded · 128 measured · Source: the US BTS 13:00 · 224 · 224 recorded · 218 measured · Source: the US BTS 14:00 · 1,096 · 1,096 recorded · 1,077 measured · Source: the US BTS 15:00 · 234 · 234 recorded · 228 measured · Source: the US BTS 16:00 · 301 · 301 recorded · 289 measured · Source: the US BTS 17:00 · 872 · 872 recorded · 846 measured · Source: the US BTS 18:00 · 859 · 859 recorded · 817 measured · Source: the US BTS 19:00 · 909 · 909 recorded · 878 measured · Source: the US BTS 20:00 · 480 · 480 recorded · 465 measured · Source: the US BTS 21:00 · 169 · 169 recorded · 153 measured · Source: the US BTS 22:00 · 1 · 1 recorded · 0 measured · Source: the US BTS 23:00 · 1 · 1 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———
05:00Fewer than 200 measured departures—199202
06:0090.7%1.9 min588597
07:0091.9%0.8 min1,0221,036
08:0093.8%0.3 min516519
09:0088.6%5.8 min457466
10:0081.5%12.2 min791799
11:0089.5%2.6 min550556
12:00Fewer than 200 measured departures—128132
13:0075.2%19.2 min218224
14:0077.4%16.4 min1,0771,096
15:0073.3%14.6 min228234
16:0082.0%8.5 min289301
17:0079.0%16.0 min846872
18:0081.2%11.6 min817859
19:0077.6%17.5 min878909
20:0074.4%15.5 min465480
21:00Fewer than 200 measured departures—153169
22:00Fewer than 200 measured departures—01
23:00Fewer than 200 measured departures—01

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 83.1% · 1,385 recorded · 1,328 measured · Source: the US BTS Tuesday · 84.4% · 1,298 recorded · 1,274 measured · Source: the US BTS Wednesday · 84.2% · 1,348 recorded · 1,313 measured · Source: the US BTS Thursday · 86.0% · 1,390 recorded · 1,362 measured · Source: the US BTS Friday · 80.2% · 1,375 recorded · 1,352 measured · Source: the US BTS Saturday · 83.7% · 1,280 recorded · 1,254 measured · Source: the US BTS Sunday · 80.5% · 1,377 recorded · 1,339 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 · 9.9 min · 1,385 recorded · 1,328 measured · Source: the US BTS Tuesday · 8.1 min · 1,298 recorded · 1,274 measured · Source: the US BTS Wednesday · 10.1 min · 1,348 recorded · 1,313 measured · Source: the US BTS Thursday · 6.3 min · 1,390 recorded · 1,362 measured · Source: the US BTS Friday · 10.8 min · 1,375 recorded · 1,352 measured · Source: the US BTS Saturday · 9.9 min · 1,280 recorded · 1,254 measured · Source: the US BTS Sunday · 15.4 min · 1,377 recorded · 1,339 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 · 1,385 · 1,385 recorded · 1,328 measured · Source: the US BTS Tuesday · 1,298 · 1,298 recorded · 1,274 measured · Source: the US BTS Wednesday · 1,348 · 1,348 recorded · 1,313 measured · Source: the US BTS Thursday · 1,390 · 1,390 recorded · 1,362 measured · Source: the US BTS Friday · 1,375 · 1,375 recorded · 1,352 measured · Source: the US BTS Saturday · 1,280 · 1,280 recorded · 1,254 measured · Source: the US BTS Sunday · 1,377 · 1,377 recorded · 1,339 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday83.1%9.9 min1,3281,385
Tuesday84.4%8.1 min1,2741,298
Wednesday84.2%10.1 min1,3131,348
Thursday86.0%6.3 min1,3621,390
Friday80.2%10.8 min1,3521,375
Saturday83.7%9.9 min1,2541,280
Sunday80.5%15.4 min1,3391,377

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 · 79.0% · 679 recorded · 647 measured · Source: the US BTS Feb · 81.3% · 696 recorded · 690 measured · Source: the US BTS Mar · 81.2% · 785 recorded · 751 measured · Source: the US BTS Apr · 82.9% · 1,072 recorded · 1,040 measured · Source: the US BTS May · 86.0% · 1,051 recorded · 1,036 measured · Source: the US BTS Jun · 81.0% · 910 recorded · 883 measured · Source: the US BTS Jul · 78.2% · 1,014 recorded · 982 measured · Source: the US BTS Aug · 85.9% · 484 recorded · 468 measured · Source: the US BTS Sep · 89.8% · 444 recorded · 442 measured · Source: the US BTS Oct · 89.9% · 779 recorded · 779 measured · Source: the US BTS Nov · 87.4% · 817 recorded · 788 measured · Source: the US BTS Dec · 78.2% · 722 recorded · 716 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 · 12.6 min · 679 recorded · 647 measured · Source: the US BTS Feb · 13.5 min · 696 recorded · 690 measured · Source: the US BTS Mar · 11.3 min · 785 recorded · 751 measured · Source: the US BTS Apr · 8.7 min · 1,072 recorded · 1,040 measured · Source: the US BTS May · 6.2 min · 1,051 recorded · 1,036 measured · Source: the US BTS Jun · 13.3 min · 910 recorded · 883 measured · Source: the US BTS Jul · 15.9 min · 1,014 recorded · 982 measured · Source: the US BTS Aug · 8.5 min · 484 recorded · 468 measured · Source: the US BTS Sep · 3.2 min · 444 recorded · 442 measured · Source: the US BTS Oct · 1.5 min · 779 recorded · 779 measured · Source: the US BTS Nov · 5.5 min · 817 recorded · 788 measured · Source: the US BTS Dec · 18.4 min · 722 recorded · 716 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 · 679 · 679 recorded · 647 measured · Source: the US BTS Feb · 696 · 696 recorded · 690 measured · Source: the US BTS Mar · 785 · 785 recorded · 751 measured · Source: the US BTS Apr · 1,072 · 1,072 recorded · 1,040 measured · Source: the US BTS May · 1,051 · 1,051 recorded · 1,036 measured · Source: the US BTS Jun · 910 · 910 recorded · 883 measured · Source: the US BTS Jul · 1,014 · 1,014 recorded · 982 measured · Source: the US BTS Aug · 484 · 484 recorded · 468 measured · Source: the US BTS Sep · 444 · 444 recorded · 442 measured · Source: the US BTS Oct · 779 · 779 recorded · 779 measured · Source: the US BTS Nov · 817 · 817 recorded · 788 measured · Source: the US BTS Dec · 722 · 722 recorded · 716 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan79.0%12.6 min647679
Feb81.3%13.5 min690696
Mar81.2%11.3 min751785
Apr82.9%8.7 min1,0401,072
May86.0%6.2 min1,0361,051
Jun81.0%13.3 min883910
Jul78.2%15.9 min9821,014
Aug85.9%8.5 min468484
Sep89.8%3.2 min442444
Oct89.9%1.5 min779779
Nov87.4%5.5 min788817
Dec78.2%18.4 min716722

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 81.1% 7,666
  • Delayed >15 min 16.5% 1,556
  • Cancelled 2.4% 231
  • 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

97
97 of 97
Flight numbersBy direction DeparturesOn time
YX3422 SDF → ORD 622 92.4%
YX4622 SDF → ORD 527 91.9%
YX3598 ORD → SDF 496 83.3%
YX4603 ORD → SDF 461 73.7%
YX3653 SDF → ORD 399 92.9%
YX3551 ORD → SDF 358 77.4%
MQ3741 ORD → SDF 220 82.9%
YX3714 ORD → SDF 201 86.5%
YX3534 ORD → SDF 104 86.5%
MQ3741 SDF → ORD 96 80.2%
YX4480 ORD → SDF 95 76.9%
MQ4220 SDF → ORD 86 65.5%
YX4593 ORD → SDF 86 70.9%
YX3538 SDF → ORD 85 78.6%
YX4476 SDF → ORD 75 93.2%
YX4599 ORD → SDF 74 75.3%
OO5950 ORD → SDF 72 67.1%
YX3659 ORD → SDF 72 84.4%
YX3406 ORD → SDF 71 91.3%
YX4668 SDF → ORD 70 82.5%
YX4668 ORD → SDF 70 81.8%
MQ3539 SDF → ORD 68 91.2%
YX4704 SDF → ORD 68 92.7%
YX4704 ORD → SDF 68 92.7%
MQ3976 SDF → ORD 62 77.4%
MQ3526 ORD → SDF 60 64.4%
MQ3900 SDF → ORD 59 89.8%
MQ3736 SDF → ORD 56 96.4%
OO5592 SDF → ORD 56 72.2%
YX3511 SDF → ORD 55 85.5%
OO5612 SDF → ORD 52 58.8%
OO5698 ORD → SDF 52 88.2%
OO5846 SDF → ORD 52 86.5%
MQ3930 ORD → SDF 50 92.0%
YX4432 ORD → SDF 46 76.7%
YX4432 SDF → ORD 46 87.5%
OO5615 SDF → ORD 45 69.8%
YX4630 ORD → SDF 44 75.6%
YX4692 SDF → ORD 44 90.7%
YX4697 ORD → SDF 44 81.0%
YX4757 SDF → ORD 44 90.7%
YX4599 SDF → ORD 43 84.6%
YX4646 ORD → SDF 43 90.7%
YX4646 SDF → ORD 43 92.9%
YX3470 ORD → SDF 38 100.0%
OO4788 ORD → SDF 37 64.9%
OO5231 SDF → ORD 37 68.6%
OO5412 ORD → SDF 37 83.3%
OO5929 SDF → ORD 37 73.5%
YX3500 SDF → ORD 37 94.6%
YX3546 ORD → SDF 37 91.9%
YX3696 SDF → ORD 37 97.3%
YX3434 SDF → ORD 36 86.1%
YX3449 SDF → ORD 36 94.4%
YX3660 ORD → SDF 36 88.9%
YX3713 SDF → ORD 36 88.9%
YX4360 SDF → ORD 36 67.7%
YX4360 ORD → SDF 36 69.4%
OO5235 ORD → SDF 35 74.3%
OO5272 SDF → ORD 35 60.0%
OO5382 SDF → ORD 35 75.0%
OO5571 ORD → SDF 35 75.0%
OO5607 ORD → SDF 35 67.7%
YX3682 ORD → SDF 35 94.3%
YX3694 SDF → ORD 35 80.0%
YX4428 ORD → SDF 35 62.9%
OO4670 ORD → SDF 34 88.2%
OO5261 ORD → SDF 34 55.9%
OO5264 SDF → ORD 34 62.5%
MQ4005 ORD → SDF 33 90.9%
OO5671 ORD → SDF 32 62.5%
YX4428 SDF → ORD 32 71.9%
YX4539 SDF → ORD 32 67.7%
MQ3564 SDF → ORD 31 74.2%
MQ4099 ORD → SDF 31 83.9%
OO5467 ORD → SDF 31 86.7%
OO5603 SDF → ORD 31 73.3%
OO5629 SDF → ORD 31 77.4%
OO5644 SDF → ORD 31 83.9%
OO5703 ORD → SDF 31 80.7%
OO5899 ORD → SDF 31 87.1%
YX3520 SDF → ORD 31 100.0%
YX3571 ORD → SDF 31 100.0%
YX3674 SDF → ORD 31 96.8%
YX4363 ORD → SDF 31 87.1%
YX4367 SDF → ORD 31 100.0%
MQ4005 SDF → ORD 30 86.2%
MQ4155 ORD → SDF 30 89.7%
OO5361 SDF → ORD 30 89.3%
OO5496 ORD → SDF 30 83.3%
OO5521 SDF → ORD 30 80.0%
OO5835 ORD → SDF 30 100.0%
YX3520 ORD → SDF 30 76.7%
YX4602 ORD → SDF 30 61.5%
YX4698 SDF → ORD 30 82.1%
YX4768 ORD → SDF 30 82.1%
YX4768 SDF → ORD 30 75.9%

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 476 −5.9% 20 84.2%
June 2026 436 −2.5% 26 81.0%
May 2026 610 +43.2% 13 83.1%
April 2026 597 +34.8% 26 81.6%
March 2026 413 +22.2% 27 78.0%
February 2026 394 +33.1% 2 81.5%
January 2026 350 +17.8% 13 74.9%
December 2025 352 −3.3% 6 75.3%
November 2025 359 −16.3% 29 83.3%
October 2025 512 +91.8% 0 87.7%
September 2025 442 2 89.8%
August 2025 468 16 85.9%
July 2025 506 12 72.5%
June 2025 447 1 81.0%
May 2025 426 2 90.1%
April 2025 443 6 84.7%
March 2025 338 7 85.2%
February 2025 296 4 81.1%
January 2025 297 19 83.8%
December 2024 364 0 81.0%
November 2024 429 0 90.9%
October 2024 267 0 94.0%

How to read this chart

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