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Route on-time record

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

Baltimore (Baltimore/Washington International Thurgood Marshall Airport) to San Diego (San Diego International Airport). 1,120 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 1.4% were cancelled. The most reliable flight number was Southwest 1876 at 6:45 AM.

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

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BWI → SAN

Baltimore to San Diego: 1,120 nonstop flights a year

On time (12 months)

77%

Cancelled

1.4%

avg delay 14 min

Best time to leave

Before 9 AM

88% on time vs 60% 3 to 6 PM

Most reliable airline

Southwest

76% chance on time

Check BWI to SAN fares

Lowest nonstop fare seen in the next two months: $211 (Southwest 752 on 2026-11-11). 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 1876

    6:45 AM → 9:20 AM5h 35m nonstop

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

    83%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 82% of the time (22 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 3 to 6 PM: 60%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
    • Lands inside SAN's trouble window: 66% of its 166 ground stops and delay programs started between 6 AM and noon.

    Limited track record · 22 flights

    Find Southwest 1876 fares Opens this date on Aviasales

  2. #2 · Southwest 1301

    9:55 AM → 12:30 PM5h 35m nonstop

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

    82%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 82% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • 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 · 55 flights

    Find Southwest 1301 fares Opens this date on Aviasales

  3. #3 · Southwest 4628

    12:10 PM → 2:45 PM5h 35m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    79%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
    • 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 · 8 flights

    Find Southwest 4628 fares Opens this date on Aviasales

  4. #4 · Southwest 1306

    7:20 PM → 10:00 PM5h 40m nonstop

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

    70%

    chance on time

    On time (history)
    65%
    Cancelled
    0.0%
    Avg arrival delay
    20 min
    • Arrived on time 65% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 55 flights

    Find Southwest 1306 fares Opens this date on Aviasales

  5. #5 · Southwest 1304

    4:25 PM → 7:00 PM5h 35m nonstop

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

    61%

    chance on time

    On time (history)
    51%
    Cancelled
    0.0%
    Avg arrival delay
    32 min
    • Arrived on time 51% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 60% on time; Before 9 AM: 88%).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 39 flights

    Find Southwest 1304 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines76%

    1,120 flights · 77% on time as flown · 1.4% cancel

On time by departure time

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

  • Before 9 AM88%

    344 flights · avg delay 6 min

  • 9 AM to noon86%

    145 flights · avg delay 10 min

  • Noon to 3 PM70%

    153 flights · avg delay 21 min

  • 3 to 6 PM60%

    124 flights · avg delay 24 min

  • 6 to 9 PM74%

    345 flights · avg delay 15 min

Best day: Tuesday (78%). Worst: Sunday (71%).

Smarter routing

Nearby airports that run more on time

  • IAD → SAN 83% chance on time

    Washington Dulles International Airport to San Diego International Airport · 1,400 flights a year · 45 mi from your airports · yours: 76%

    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
84
F
76
M
79
A
69
M
72
J
70
J
60
A
79
S
75
O
76
N
87
D
76

What delays this route

  • Airline (crew, maintenance, boarding)38%
  • Late-arriving aircraft36%
  • Air traffic control and airport volume21%
  • Severe weather4%

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

Finding the most reliable connections from BWI to SAN…

BWI to SAN questions

What time of day is best to fly BWI to SAN?
Before 9 AM: 88% of flights arrived on time, against 60% 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 SAN?
Southwest, with a season-adjusted 76% chance of operating and arriving on time over 1,120 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 SAN?
July (60% 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 BWI

Most on-time flights from BWI on every route →

Live status: FAA delays and ground stops