Route on-time record

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

Chicago (Chicago Midway International Airport) to Baltimore (Baltimore/Washington International Thurgood Marshall Airport). 1,856 nonstop flights in Jun 2025 to May 2026, 79% arrived within 15 minutes and 2.6% were cancelled. The most reliable flight number was Southwest 3203 at 6:35 AM.

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

MDW → BWI

Chicago to Baltimore: 1,856 nonstop flights a year

On time (12 months)

79%

Cancelled

2.6%

avg delay 14 min

Best time to leave

Before 9 AM

93% on time vs 60% 6 to 9 PM

Most reliable airline

Southwest

77% chance on time

Check MDW to BWI fares

Lowest nonstop fare seen in the next two months: $210 (Southwest 2848 on 2026-10-24). 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 3203
6:35 AM → 9:30 AM1h 55m nonstop
Local times, typical schedule. Last flown 2026-04-06.
91%
chance on time
On time (history)
97%
Cancelled
0.0%
Avg arrival delay
2 min
- Arrived on time 97% of the time (33 flights, Jun 2025 to May 2026).
- Never cancelled in 33 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 60%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
Limited track record · 33 flights
Find Southwest 3203 fares Opens this date on Aviasales
#2 · Southwest 1266
9:00 AM → 11:50 AM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
On time (history)
91%
Cancelled
0.0%
Avg arrival delay
5 min
- Arrived on time 91% of the time (54 flights, Jun 2025 to May 2026).
- Never cancelled in 54 scheduled flights.
- 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 (54 flights), so its score leans on the airline's record at this hour.
Limited track record · 54 flights
Find Southwest 1266 fares Opens this date on Aviasales
#3 · Southwest 2561
7:30 AM → 10:20 AM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
On time (history)
87%
Cancelled
0.0%
Avg arrival delay
4 min
- Arrived on time 87% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 93% on time; 6 to 9 PM: 60%).
- 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 · 55 flights
Find Southwest 2561 fares Opens this date on Aviasales
#4 · Southwest 1162
11:45 AM → 2:35 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-29.
83%
chance on time
On time (history)
87%
Cancelled
0.0%
Avg arrival delay
8 min
- Arrived on time 87% of the time (23 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 BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 1162 fares Opens this date on Aviasales
#5 · Southwest 857
12:05 PM → 2:55 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 2037; its record covers all of them.
83%
chance on time
On time (history)
94%
Cancelled
5.6%
Avg arrival delay
4 min
- Arrived on time 94% of the time (17 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 BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (17 flights), so its score leans on the airline's record at this hour.
Limited track record · 17 flights
Find Southwest 857 fares Opens this date on Aviasales
#6 · Southwest 3247
1:00 PM → 3:50 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
On time (history)
83%
Cancelled
0.0%
Avg arrival delay
11 min
- Arrived on time 83% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- Lands inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
Limited track record · 47 flights
Find Southwest 3247 fares Opens this date on Aviasales
#7 · Southwest 2713
10:35 AM → 1:20 PM1h 45m nonstop
Local times, typical schedule. Last flown 2026-04-06.
79%
chance on time
On time (history)
83%
Cancelled
13.3%
Avg arrival delay
9 min
- Arrived on time 83% of the time (12 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.
- Short track record (12 flights), so its score leans on the airline's record at this hour.
Limited track record · 12 flights
Find Southwest 2713 fares Opens this date on Aviasales
#8 · Southwest 1473
5:40 PM → 8:25 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-04-05.
69%
chance on time
On time (history)
76%
Cancelled
5.6%
Avg arrival delay
20 min
- Arrived on time 76% of the time (17 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 (17 flights), so its score leans on the airline's record at this hour.
Limited track record · 17 flights
Find Southwest 1473 fares Opens this date on Aviasales
#9 · Southwest 1766
5:00 PM → 7:45 PM1h 45m nonstop
Local times, typical schedule. Last flown 2026-04-06.
63%
chance on time
On time (history)
60%
Cancelled
8.7%
Avg arrival delay
42 min
- Arrived on time 60% of the time (20 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 BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 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 1766 fares Opens this date on Aviasales
#10 · Southwest 2170
5:50 PM → 8:40 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
63%
chance on time
On time (history)
61%
Cancelled
0.0%
Avg arrival delay
18 min
- Arrived on time 61% of the time (54 flights, Jun 2025 to May 2026).
- Never cancelled in 54 scheduled flights.
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- 54% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 54 flights
Find Southwest 2170 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

Southwest Airlines77%
1,759 flights · 79% on time as flown · 2.7% cancel
Frontier Airlines75%
97 flights · 76% on time as flown · 2.0% cancel

On time by departure time

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

Before 9 AM93%
512 flights · avg delay 3 min
9 AM to noon86%
361 flights · avg delay 8 min
Noon to 3 PM78%
334 flights · avg delay 16 min
3 to 6 PM65%
267 flights · avg delay 23 min
6 to 9 PM60%
249 flights · avg delay 25 min
After 9 PM61%
133 flights · avg delay 30 min

Best day: Tuesday (81%). Worst: Monday (76%).

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)32%
Air traffic control and airport volume19%
Severe weather2%

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 BWI questions

What time of day is best to fly MDW to BWI?: Before 9 AM: 93% of flights arrived on time, against 60% 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 BWI?: Southwest, with a season-adjusted 77% chance of operating and arriving on time over 1,759 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 BWI?: July (66% on time); the best was November (87%), 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

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