Route on-time record
MDW to SJC: most on-time flights and the best time to fly
Chicago (Chicago Midway International Airport) to San Jose (Norman Y. Mineta San Jose International Airport). 545 nonstop flights in Jun 2025 to May 2026, 71% arrived within 15 minutes and 1.1% were cancelled. The most reliable flight number was Southwest 1284 at 10:10 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
MDW → SJC
Chicago to San Jose: 545 nonstop flights a year
On time (12 months)
71%
Cancelled
1.1%
avg delay 16 min
Best time to leave
Before 9 AM
84% on time vs 59% 6 to 9 PM
Most reliable airline
Southwest
70% chance on time
Lowest nonstop fare seen in the next two months: $226 (Southwest 1930 on 2026-11-15). 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 1284
10:10 AM → 12:45 PM4h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3372; its record covers all of them.
73%
chance on time
- On time (history)
- 72%
- Cancelled
- 1.3%
- Avg arrival delay
- 13 min
- Arrived on time 72% of the time (79 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.
Moderate track record · 79 flights
Find Southwest 1284 fares Opens this date on Aviasales#2 · Southwest 826
3:40 PM → 6:15 PM4h 35m nonstop
Local times, typical schedule. Last flown 2026-05-27.
71%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 18 min
- Arrived on time 75% of the time (16 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).
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 826 fares Opens this date on Aviasales#3 · Southwest 1142
5:20 PM → 7:55 PM4h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
66%
chance on time
- On time (history)
- 56%
- Cancelled
- 0.0%
- Avg arrival delay
- 23 min
- Arrived on time 56% of the time (16 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).
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 1142 fares Opens this date on Aviasales#4 · Southwest 3385
8:25 PM → 11:00 PM4h 35m nonstop
Local times, typical schedule. Last flown 2026-05-29.
63%
chance on time
- On time (history)
- 57%
- Cancelled
- 0.0%
- Avg arrival delay
- 31 min
- Arrived on time 57% of the time (23 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 59% on time; Before 9 AM: 84%).
- 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 3385 fares Opens this date on Aviasales#5 · Southwest 4006
8:00 PM → 10:40 PM4h 40m nonstop
Local times, typical schedule. Last flown 2026-04-06.
60%
chance on time
- On time (history)
- 48%
- Cancelled
- 8.7%
- Avg arrival delay
- 31 min
- Arrived on time 48% of the time (21 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 59% on time; Before 9 AM: 84%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- 71% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 21 flights
Find Southwest 4006 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines70%
545 flights · 71% on time as flown · 1.1% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM84%
169 flights · avg delay 9 min
- 9 AM to noon75%
109 flights · avg delay 11 min
- 3 to 6 PM64%
119 flights · avg delay 20 min
- 6 to 9 PM59%
132 flights · avg delay 25 min
Best day: Saturday (74%). Worst: Sunday (66%).
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 aircraft50%
- Airline (crew, maintenance, boarding)38%
- Air traffic control and airport volume12%
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 SJC questions
- What time of day is best to fly MDW to SJC?
- Before 9 AM: 84% of flights arrived on time, against 59% 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 MDW to SJC?
- Southwest, with a season-adjusted 70% chance of operating and arriving on time over 545 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 SJC?
- July (62% on time); the best was February (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
- SJC to MDW (return)
- MDW to ATL 80%
- MDW to PHX 76%
- MDW to MCO 77%
- MDW to MSP 78%
- MDW to LAS 77%
- MDW to DEN 73%
- MDW to LGA 69%
- MDW to DAL 77%
- MDW to DCA 69%
- MDW to MCI 79%
- MDW to BNA 80%
- MDW to BWI 79%
Live status: FAA delays and ground stops