Las Vegas (LAS) to Chicago (MDW): On-Time Performance
Data through July 2026
When you fly LAS to MDW matters as much as anything else about the booking: the route swung from 90% on-time in November 2024 to just 60% in July 2024. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 69%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 6.3
- last 12 months
- Duration
- 3h 33m
- scheduled
- Distance
- 1,521 mi
Best airline from LAS to MDW
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 79% | 12 min | 0.5% | 5,194 |
| Frontier Airlines | 67% | 23 min | 3.0% | 231 |
Monthly on-time trend
Best time to fly from LAS to MDW
Aim for departures around 6 a.m. (96% on-time); avoid 7 p.m. departures (48%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 13 min |
| Tuesday | 83% | 10 min |
| Wednesday | 83% | 9 min |
| Thursday | 72% | 15 min |
| Friday | 73% | 15 min |
| Saturdaybest | 85% | 10 min |
| Sunday | 75% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft48%
- Airline operations40%
- National airspace system11%
- Weather1%
Frequently asked questions
- How often are flights from LAS to MDW delayed?
- 22% of LAS–MDW flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 12 minutes.
- Which airline is most reliable from LAS to MDW?
- Southwest Airlines has the best on-time record on this route at 79%, based on 5,194 flights. 2 airlines flew LAS–MDW frequently enough to compare in this period.
- What is the best time of day to fly from LAS to MDW?
- Departures around 6 a.m. have the best record (96% on-time), while departures around 7 p.m. have the worst (48%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from LAS to MDW?
- The scheduled LAS–MDW flight time averages 3h 33m over 1,521 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are LAS to MDW flights cancelled?
- 0.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from LAS to MDW?
- July 2024 was the roughest month in this dataset, with only 60% of arrivals on time. The best was November 2024 at 90%. If your dates are flexible, that 31-point gap is worth planning around.
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Based on 5,427 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.