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2,740 km · Domestic

Chicago Midway (MDW) – Ontario (ONT)

In July 2026, 62 flights operated between Chicago Midway and Ontario (both directions), and 59.7% 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
January5554▼ 1.8%
February5254▲ 3.8%
March61610.0%
April60600.0%
May62620.0%
June60600.0%
July62620.0%
August61––
September60––
October62–in progress
November57––
December62––
Year to date (Jan–Jul)412413▲ 0.2%

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
January81.8%87.0%▲ 6.4%
February96.2%96.3%▲ 0.1%
March90.2%78.7%▼ 12.7%
April95.0%76.7%▼ 19.3%
May88.7%71.0%▼ 20.0%
June73.3%61.7%▼ 15.8%
July71.0%59.7%▼ 15.9%
August80.3%––
September81.7%––
October88.7%–in progress
November94.7%––
December77.4%––
Year-to-date average (Jan–Jul)85.2%75.9%▼ 10.9%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January10▼ 100.0%
February00–
March110.0%
April00–
May00–
June00–
July00–
August1––
September0––
October0–in progress
November3––
December0––
Year to date (Jan–Jul)21▼ 50.0%

By direction

MDW → ONT

Scheduled flights
644
Flights operated
639
Cancelled
5 · 0.8%
On-time departures
73.9%

ONT → MDW

Scheduled flights
644
Flights operated
642
Cancelled
2 · 0.3%
On-time departures
88.9%

MDW → ONT and ONT → MDW counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 1,288 100.0% 81.4% 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 delay08:00–09:001.7min · 207 recorded · 206 measured
Gap to highest-delay hour11.9min08:00 ↔ 11:00
Recorded flights1,288MDW–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 · Fewer than 200 measured departures · 52 recorded · 52 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 178 recorded · 178 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 47 recorded · 46 measured · Source: the US BTS 08:00 · 93.2% · 207 recorded · 206 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 44 recorded · 44 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 96 recorded · 96 measured · Source: the US BTS 11:00 · 74.5% · 214 recorded · 212 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 62 recorded · 62 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 41 recorded · 41 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 15 recorded · 15 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 37 recorded · 37 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 6 recorded · 6 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 40 recorded · 40 measured · Source: the US BTS 18:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 8 recorded · 7 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 66 recorded · 65 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 18 recorded · 17 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 8 recorded · 8 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 149 recorded · 149 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 · 52 recorded · 52 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 178 recorded · 178 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 47 recorded · 46 measured · Source: the US BTS 08:00 · 1.7 min · 207 recorded · 206 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 44 recorded · 44 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 96 recorded · 96 measured · Source: the US BTS 11:00 · 13.6 min · 214 recorded · 212 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 62 recorded · 62 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 41 recorded · 41 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 15 recorded · 15 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 37 recorded · 37 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 6 recorded · 6 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 40 recorded · 40 measured · Source: the US BTS 18:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 8 recorded · 7 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 66 recorded · 65 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 18 recorded · 17 measured · Source: the US BTS 22:00 · Fewer than 200 measured departures · 8 recorded · 8 measured · Source: the US BTS 23:00 · Fewer than 200 measured departures · 149 recorded · 149 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 · 52 · 52 recorded · 52 measured · Source: the US BTS 06:00 · 178 · 178 recorded · 178 measured · Source: the US BTS 07:00 · 47 · 47 recorded · 46 measured · Source: the US BTS 08:00 · 207 · 207 recorded · 206 measured · Source: the US BTS 09:00 · 44 · 44 recorded · 44 measured · Source: the US BTS 10:00 · 96 · 96 recorded · 96 measured · Source: the US BTS 11:00 · 214 · 214 recorded · 212 measured · Source: the US BTS 12:00 · 62 · 62 recorded · 62 measured · Source: the US BTS 13:00 · 41 · 41 recorded · 41 measured · Source: the US BTS 14:00 · 15 · 15 recorded · 15 measured · Source: the US BTS 15:00 · 37 · 37 recorded · 37 measured · Source: the US BTS 16:00 · 6 · 6 recorded · 6 measured · Source: the US BTS 17:00 · 40 · 40 recorded · 40 measured · Source: the US BTS 18:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 19:00 · 8 · 8 recorded · 7 measured · Source: the US BTS 20:00 · 66 · 66 recorded · 65 measured · Source: the US BTS 21:00 · 18 · 18 recorded · 17 measured · Source: the US BTS 22:00 · 8 · 8 recorded · 8 measured · Source: the US BTS 23:00 · 149 · 149 recorded · 149 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—5252
06:00Fewer than 200 measured departures—178178
07:00Fewer than 200 measured departures—4647
08:0093.2%1.7 min206207
09:00Fewer than 200 measured departures—4444
10:00Fewer than 200 measured departures—9696
11:0074.5%13.6 min212214
12:00Fewer than 200 measured departures—6262
13:00Fewer than 200 measured departures—4141
14:00Fewer than 200 measured departures—1515
15:00Fewer than 200 measured departures—3737
16:00Fewer than 200 measured departures—66
17:00Fewer than 200 measured departures—4040
18:00No observations———
19:00Fewer than 200 measured departures—78
20:00Fewer than 200 measured departures—6566
21:00Fewer than 200 measured departures—1718
22:00Fewer than 200 measured departures—88
23:00Fewer than 200 measured departures—149149

Day of week

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 188 · 188 recorded · 186 measured · Source: the US BTS Tuesday · 188 · 188 recorded · 188 measured · Source: the US BTS Wednesday · 188 · 188 recorded · 186 measured · Source: the US BTS Thursday · 188 · 188 recorded · 188 measured · Source: the US BTS Friday · 188 · 188 recorded · 188 measured · Source: the US BTS Saturday · 160 · 160 recorded · 158 measured · Source: the US BTS Sunday · 188 · 188 recorded · 187 measured · Source: the US BTS

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

No bucket in this view has 200 measured departures yet. Flight counts are shown; on-time and delay charts become available when the sample is large enough.

View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
MondayFewer than 200 measured departures—186188
TuesdayFewer than 200 measured departures—188188
WednesdayFewer than 200 measured departures—186188
ThursdayFewer than 200 measured departures—188188
FridayFewer than 200 measured departures—188188
SaturdayFewer than 200 measured departures—158160
SundayFewer than 200 measured departures—187188

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 110 · 110 recorded · 109 measured · Source: the US BTS Feb · 106 · 106 recorded · 106 measured · Source: the US BTS Mar · 124 · 124 recorded · 122 measured · Source: the US BTS Apr · 120 · 120 recorded · 120 measured · Source: the US BTS May · 124 · 124 recorded · 124 measured · Source: the US BTS Jun · 120 · 120 recorded · 120 measured · Source: the US BTS Jul · 124 · 124 recorded · 124 measured · Source: the US BTS Aug · 62 · 62 recorded · 61 measured · Source: the US BTS Sep · 60 · 60 recorded · 60 measured · Source: the US BTS Oct · 102 · 102 recorded · 102 measured · Source: the US BTS Nov · 116 · 116 recorded · 113 measured · Source: the US BTS Dec · 120 · 120 recorded · 120 measured · Source: the US BTS

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

No bucket in this view has 200 measured departures yet. Flight counts are shown; on-time and delay charts become available when the sample is large enough.

View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—109110
FebFewer than 200 measured departures—106106
MarFewer than 200 measured departures—122124
AprFewer than 200 measured departures—120120
MayFewer than 200 measured departures—124124
JunFewer than 200 measured departures—120120
JulFewer than 200 measured departures—124124
AugFewer than 200 measured departures—6162
SepFewer than 200 measured departures—6060
OctFewer than 200 measured departures—102102
NovFewer than 200 measured departures—113116
DecFewer than 200 measured departures—120120

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 81.0% 1,043
  • Delayed >15 min 18.5% 238
  • Cancelled 0.5% 7
  • 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

22
22 of 22
Flight numbersBy direction DeparturesOn time
WN925 ONT → MDW 105 86.5%
WN1324 MDW → ONT 62 88.7%
WN3788 ONT → MDW 61 88.5%
WN2650 MDW → ONT 58 86.2%
WN3153 ONT → MDW 58 74.1%
WN3332 MDW → ONT 58 62.1%
WN3658 ONT → MDW 58 86.2%
WN3026 ONT → MDW 53 92.5%
WN4680 MDW → ONT 53 92.5%
WN3058 ONT → MDW 46 95.7%
WN872 MDW → ONT 46 93.3%
WN2511 MDW → ONT 44 63.6%
WN1500 MDW → ONT 42 65.9%
WN2846 MDW → ONT 42 42.9%
WN3091 MDW → ONT 35 74.3%
WN1269 ONT → MDW 33 100.0%
WN2212 ONT → MDW 33 93.9%
WN3123 MDW → ONT 33 62.5%
WN654 ONT → MDW 33 90.9%
WN4134 ONT → MDW 32 90.6%
WN3857 MDW → ONT 30 76.7%
WN561 ONT → MDW 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 62 +0.0% 0 59.7%
June 2026 60 +0.0% 0 61.7%
May 2026 62 +0.0% 0 71.0%
April 2026 60 +0.0% 0 76.7%
March 2026 61 +0.0% 1 78.7%
February 2026 54 +3.8% 0 96.3%
January 2026 54 −1.8% 0 87.0%
December 2025 62 +6.9% 0 77.4%
November 2025 57 +1.8% 3 94.7%
October 2025 62 +55.0% 0 88.7%
September 2025 60 0 81.7%
August 2025 61 1 80.3%
July 2025 62 0 71.0%
June 2025 60 0 73.3%
May 2025 62 0 88.7%
April 2025 60 0 95.0%
March 2025 61 1 90.2%
February 2025 52 0 96.2%
January 2025 55 1 81.8%
December 2024 58 0 74.1%
November 2024 56 0 87.5%
October 2024 40 0 87.5%

How to read this chart

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