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Route on-time record

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

Baltimore (Baltimore/Washington International Thurgood Marshall Airport) to Charleston (Charleston International Airport). 1,253 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 1.4% were cancelled. The most reliable flight number was Southwest 1448 at 8:10 AM.

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

BWI → CHS

Baltimore to Charleston: 1,253 nonstop flights a year

On time (12 months)

80%

Cancelled

1.4%

avg delay 13 min

Best time to leave

Before 9 AM

90% on time vs 70% 3 to 6 PM

Most reliable airline

Southwest

79% chance on time

Check BWI to CHS fares

Lowest nonstop fare seen in the next two months: $324 (Southwest 972 on 2026-10-26). 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. #1 · Southwest 1448

    8:10 AM → 10:00 AM1h 50m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    88%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 91% 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: 90% on time; 3 to 6 PM: 70%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Limited track record · 33 flights

    Find Southwest 1448 fares Opens this date on Aviasales

  2. #2 · Southwest 297

    8:20 AM → 10:15 AM1h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    86%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 87% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 70%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Limited track record · 39 flights

    Find Southwest 297 fares Opens this date on Aviasales

  3. #3 · Southwest 1086

    11:50 AM → 1:35 PM1h 45m nonstop

    Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 2795; its record covers all of them.

    81%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 82% of the time (68 flights, Jun 2025 to May 2026).
    • Never cancelled in 68 scheduled flights.
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Moderate track record · 68 flights

    Find Southwest 1086 fares Opens this date on Aviasales

  4. #4 · Southwest 3144

    7:40 PM → 9:30 PM1h 45m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    77%

    chance on time

    On time (history)
    78%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 78% of the time (54 flights, Jun 2025 to May 2026).
    • Never cancelled in 54 scheduled flights.
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • 73% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 54 flights

    Find Southwest 3144 fares Opens this date on Aviasales

  5. #5 · Southwest 4718

    5:25 PM → 7:10 PM1h 45m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    74%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 70% on time; Before 9 AM: 90%).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 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 4718 fares Opens this date on Aviasales

  6. #6 · Southwest 1286

    8:00 PM → 9:45 PM1h 45m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    69%

    chance on time

    On time (history)
    70%
    Cancelled
    0.0%
    Avg arrival delay
    20 min
    • Arrived on time 70% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • 60% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 33 flights

    Find Southwest 1286 fares Opens this date on Aviasales

  7. #7 · Southwest 1291

    5:35 PM → 7:20 PM1h 45m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 232; its record covers all of them.

    68%

    chance on time

    On time (history)
    66%
    Cancelled
    1.9%
    Avg arrival delay
    11 min
    • Arrived on time 66% of the time (53 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 70% on time; Before 9 AM: 90%).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (53 flights), so its score leans on the airline's record at this hour.

    Limited track record · 53 flights

    Find Southwest 1291 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines79%

    1,232 flights · 80% on time as flown · 1.5% cancel

On time by departure time

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

  • Before 9 AM90%

    328 flights · avg delay 4 min

  • 9 AM to noon85%

    157 flights · avg delay 7 min

  • Noon to 3 PM83%

    178 flights · avg delay 10 min

  • 3 to 6 PM70%

    231 flights · avg delay 19 min

  • 6 to 9 PM73%

    357 flights · avg delay 22 min

Best day: Tuesday (79%). Worst: Sunday (74%).

Smarter routing

Nearby airports that run more on time

  • IAD → CHS 85% chance on time

    Washington Dulles International Airport to Charleston International Airport · 761 flights a year · 45 mi from your airports · yours: 79%

    Rank flightsFares

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.

J
77
F
86
M
79
A
79
M
72
J
70
J
62
A
76
S
81
O
79
N
83
D
75

What delays this route

  • Late-arriving aircraft53%
  • Airline (crew, maintenance, boarding)27%
  • Air traffic control and airport volume17%
  • 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

BWI to CHS questions

What time of day is best to fly BWI to CHS?
Before 9 AM: 90% of flights arrived on time, against 70% for departures 3 to 6 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 BWI to CHS?
Southwest, with a season-adjusted 79% chance of operating and arriving on time over 1,232 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 BWI to CHS?
July (62% on time); the best was February (86%), 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 BWI

Live status: FAA delays and ground stops