Route on-time record

MDW to LAS: most on-time flights and the best time to fly

Chicago (Chicago Midway International Airport) to Las Vegas (Harry Reid International Airport). 2,405 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was Southwest 3285 at 7:50 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

MDW → LAS

Chicago to Las Vegas: 2,405 nonstop flights a year

On time (12 months)

77%

Cancelled

1.0%

avg delay 13 min

Best time to leave

Before 9 AM

91% on time vs 53% after 9 PM

Most reliable airline

Southwest

76% chance on time

Check MDW to LAS fares

Lowest nonstop fare seen in the next two months: $165 (Southwest 2949 on 2026-11-13). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

#1 · Southwest 3285
7:50 AM → 9:50 AM4h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
On time (history)
96%
Cancelled
0.0%
Avg arrival delay
2 min
- Arrived on time 96% of the time (54 flights, Jun 2025 to May 2026).
- Never cancelled in 54 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
Limited track record · 54 flights
Find Southwest 3285 fares Opens this date on Aviasales
#2 · Southwest 4200
5:00 AM → 7:05 AM4h 05m nonstop
Local times, typical schedule. Last flown 2026-04-06.
91%
chance on time
On time (history)
100%
Cancelled
0.0%
Avg arrival delay
0 min
- Arrived on time 100% of the time (20 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- Short track record (20 flights), so its score leans on the airline's record at this hour.
Limited track record · 20 flights
Find Southwest 4200 fares Opens this date on Aviasales
#3 · Southwest 2668
6:30 AM → 8:45 AM4h 15m nonstop
Local times, typical schedule. Last flown 2026-04-05.
89%
chance on time
On time (history)
100%
Cancelled
0.0%
Avg arrival delay
1 min
- Arrived on time 100% of the time (18 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- Short track record (18 flights), so its score leans on the airline's record at this hour.
Limited track record · 18 flights
Find Southwest 2668 fares Opens this date on Aviasales
#4 · Southwest 1181
7:15 AM → 9:25 AM4h 10m nonstop
Local times, typical schedule. Last flown 2026-04-06.
89%
chance on time
On time (history)
95%
Cancelled
0.0%
Avg arrival delay
3 min
- Arrived on time 95% of the time (20 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
- Short track record (20 flights), so its score leans on the airline's record at this hour.
Limited track record · 20 flights
Find Southwest 1181 fares Opens this date on Aviasales
#5 · Southwest 1859
5:10 AM → 7:05 AM3h 55m nonstop
Local times, typical schedule. Last flown 2026-05-29.
88%
chance on time
On time (history)
91%
Cancelled
0.0%
Avg arrival delay
2 min
- Arrived on time 91% of the time (23 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 1859 fares Opens this date on Aviasales
#6 · Southwest 3916
6:10 AM → 8:05 AM3h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
On time (history)
88%
Cancelled
0.0%
Avg arrival delay
8 min
- Arrived on time 88% of the time (24 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 53%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find Southwest 3916 fares Opens this date on Aviasales
#7 · Southwest 1923
10:05 AM → 12:00 PM3h 55m nonstop
Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 2793, 120; its record covers all of them.
80%
chance on time
On time (history)
80%
Cancelled
1.3%
Avg arrival delay
13 min
- Arrived on time 80% of the time (74 flights, Jun 2025 to May 2026).
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Moderate track record · 74 flights
Find Southwest 1923 fares Opens this date on Aviasales
#8 · Southwest 1475
10:15 AM → 12:10 PM3h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
On time (history)
75%
Cancelled
0.0%
Avg arrival delay
8 min
- Arrived on time 75% of the time (8 flights, Jun 2025 to May 2026).
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 1475 fares Opens this date on Aviasales
#9 · Southwest 169
1:00 PM → 2:55 PM3h 55m nonstop
Local times, typical schedule. Last flown 2026-05-30.
79%
chance on time
On time (history)
100%
Cancelled
0.0%
Avg arrival delay
3 min
- Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 169 fares Opens this date on Aviasales
#10 · Southwest 3981
12:10 PM → 2:05 PM3h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
On time (history)
81%
Cancelled
0.0%
Avg arrival delay
9 min
- Arrived on time 81% of the time (31 flights, Jun 2025 to May 2026).
- Never cancelled in 31 scheduled flights.
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
Limited track record · 31 flights
Find Southwest 3981 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

Southwest Airlines76%
2,388 flights · 77% on time as flown · 0.9% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

Before 9 AM91%
677 flights · avg delay 5 min
9 AM to noon83%
454 flights · avg delay 10 min
Noon to 3 PM76%
359 flights · avg delay 12 min
3 to 6 PM68%
420 flights · avg delay 20 min
6 to 9 PM64%
341 flights · avg delay 21 min
After 9 PM53%
154 flights · avg delay 30 min

Best day: Wednesday (80%). Worst: Friday (74%).

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

What delays this route

Late-arriving aircraft45%
Airline (crew, maintenance, boarding)33%
Air traffic control and airport volume18%
Severe weather3%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

MDW to LAS questions

What time of day is best to fly MDW to LAS?: Before 9 AM: 91% of flights arrived on time, against 53% for departures after 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from MDW to LAS?: Southwest, with a season-adjusted 76% chance of operating and arriving on time over 2,388 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on MDW to LAS?: July (62% on time); the best was November (84%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?: No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from MDW

Live status: FAA delays and ground stops

All Products

Aviation Intelligence

Alerts & Airspace

Free Pilot Tools & Widgets

RC Aviation

Games & Learning

Weather Research & More

Pilot Resources

My Airports

Ask ATIS