Route on-time record
LAS to MDW: most on-time flights and the best time to fly
Las Vegas (Harry Reid International Airport) to Chicago (Chicago Midway International Airport). 2,397 nonstop flights in Jun 2025 to May 2026, 78% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was Southwest 1422 at 5:30 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
LAS → MDW
Las Vegas to Chicago: 2,397 nonstop flights a year
On time (12 months)
78%
Cancelled
0.9%
avg delay 12 min
Best time to leave
Before 9 AM
91% on time vs 57% 6 to 9 PM
Most reliable airline
Southwest
77% chance on time
Lowest nonstop fare seen in the next two months: $155 (Southwest 4990 on 2026-11-23). 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 1422
5:30 AM → 11:00 AM3h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3805; its record covers all of them.
93%
chance on time
- On time (history)
- 97%
- Cancelled
- 2.7%
- Avg arrival delay
- 1 min
- Arrived on time 97% of the time (72 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 57%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
- Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
Moderate track record · 72 flights
Find Southwest 1422 fares Opens this date on Aviasales#2 · Southwest 3198
7:40 AM → 1:10 PM3h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 85%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 85% 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; 6 to 9 PM: 57%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Limited track record · 54 flights
Find Southwest 3198 fares Opens this date on Aviasales#3 · Southwest 1582
8:05 AM → 1:35 PM3h 30m nonstop
Local times, typical schedule. Last flown 2026-04-06.
82%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 82% of the time (28 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; 6 to 9 PM: 57%).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
- Short track record (28 flights), so its score leans on the airline's record at this hour.
Limited track record · 28 flights
Find Southwest 1582 fares Opens this date on Aviasales#4 · Southwest 1230
11:55 PM → 5:25 AM3h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3591; its record covers all of them.
81%
chance on time
- On time (history)
- 79%
- Cancelled
- 1.2%
- Avg arrival delay
- 7 min
- Arrived on time 79% of the time (84 flights, Jun 2025 to May 2026).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 ground stops and delay programs started).
Moderate track record · 84 flights
Find Southwest 1230 fares Opens this date on Aviasales#5 · Southwest 2653
10:40 AM → 4:15 PM3h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 83% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (47 flights), so its score leans on the airline's record at this hour.
Limited track record · 47 flights
Find Southwest 2653 fares Opens this date on Aviasales#6 · Southwest 555
9:30 AM → 3:00 PM3h 30m nonstop
Local times, typical schedule. Last flown 2026-04-06.
79%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 78% of the time (23 flights, Jun 2025 to May 2026).
- Departs outside LAS's trouble window (10 AM to 4 PM, when 51% of its 104 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 555 fares Opens this date on Aviasales#7 · Southwest 1101
12:00 PM → 5:35 PM3h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 4001, 3587; its record covers all of them.
72%
chance on time
- On time (history)
- 73%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 73% of the time (44 flights, Jun 2025 to May 2026).
- Never cancelled in 44 scheduled flights.
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (44 flights), so its score leans on the airline's record at this hour.
Limited track record · 44 flights
Find Southwest 1101 fares Opens this date on Aviasales#8 · Southwest 3026
1:00 PM → 6:30 PM3h 30m nonstop
Local times, typical schedule. Last flown 2026-04-01.
69%
chance on time
- On time (history)
- 38%
- Cancelled
- 0.0%
- Avg arrival delay
- 23 min
- Arrived on time 38% of the time (8 flights, Jun 2025 to May 2026).
- Departs 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 3026 fares Opens this date on Aviasales#9 · Southwest 4569
3:05 PM → 8:40 PM3h 35m nonstop
Local times, typical schedule. Last flown 2026-05-27.
68%
chance on time
- On time (history)
- 69%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 69% of the time (16 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 4569 fares Opens this date on Aviasales#10 · Southwest 2728
12:20 PM → 5:55 PM3h 35m nonstop
Local times, typical schedule. Last flown 2026-05-29.
65%
chance on time
- On time (history)
- 59%
- Cancelled
- 4.3%
- Avg arrival delay
- 17 min
- Arrived on time 59% of the time (22 flights, Jun 2025 to May 2026).
- Departs inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (22 flights), so its score leans on the airline's record at this hour.
Limited track record · 22 flights
Find Southwest 2728 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines77%
2,380 flights · 78% on time as flown · 0.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM91%
692 flights · avg delay 4 min
- 9 AM to noon79%
407 flights · avg delay 10 min
- Noon to 3 PM68%
343 flights · avg delay 19 min
- 3 to 6 PM62%
403 flights · avg delay 21 min
- 6 to 9 PM57%
187 flights · avg delay 27 min
- After 9 PM87%
365 flights · avg delay 6 min
Best day: Saturday (84%). Worst: Thursday (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 aircraft47%
- Airline (crew, maintenance, boarding)41%
- Air traffic control and airport volume11%
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
LAS to MDW questions
- What time of day is best to fly LAS to MDW?
- Before 9 AM: 91% of flights arrived on time, against 57% for departures 6 to 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 LAS to MDW?
- Southwest, with a season-adjusted 77% chance of operating and arriving on time over 2,380 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 LAS to MDW?
- July (65% on time); the best was November (85%), 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 LAS
- MDW to LAS (return)
- LAS to LAX 79%
- LAS to DEN 77%
- LAS to SAN 68%
- LAS to PHX 78%
- LAS to SFO 66%
- LAS to SEA 82%
- LAS to ORD 77%
- LAS to DFW 81%
- LAS to ATL 84%
- LAS to SNA 82%
- LAS to SMF 79%
- LAS to BUR 80%
Live status: FAA delays and ground stops