Chicago (MDW) to Las Vegas (LAS): On-Time Performance
Data through July 2026
When you fly MDW to LAS matters as much as anything else about the booking: the route swung from 90% on-time in October 2024 to just 62% in June 2026. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 68%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 6.2
- last 12 months
- Duration
- 3h 57m
- scheduled
- Distance
- 1,521 mi
Best airline from MDW to LAS
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 | 0.6% | 5,147 |
| Frontier Airlines | 75% | 22 min | 3.0% | 232 |
Monthly on-time trend
Best time to fly from MDW to LAS
Aim for departures around 6 a.m. (94% on-time); avoid 9 p.m. departures (63%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 79% | 13 min |
| Tuesday | 82% | 10 min |
| Wednesdaybest | 82% | 10 min |
| Thursday | 76% | 15 min |
| Friday | 76% | 15 min |
| Saturday | 81% | 10 min |
| Sunday | 77% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft43%
- Airline operations33%
- National airspace system20%
- Weather4%
Frequently asked questions
- How often are flights from MDW to LAS delayed?
- 21% of MDW–LAS 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 13 minutes.
- Which airline is most reliable from MDW to LAS?
- Southwest Airlines has the best on-time record on this route at 79%, based on 5,147 flights. 2 airlines flew MDW–LAS frequently enough to compare in this period.
- What is the best time of day to fly from MDW to LAS?
- Departures around 6 a.m. have the best record (94% on-time), while departures around 9 p.m. have the worst (63%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MDW to LAS?
- The scheduled MDW–LAS flight time averages 3h 57m over 1,521 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are MDW to LAS flights cancelled?
- 0.7% 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 MDW to LAS?
- June 2026 was the roughest month in this dataset, with only 62% of arrivals on time. The best was October 2024 at 90%. If your dates are flexible, that 28-point gap is worth planning around.
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Based on 5,381 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.