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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

BWI → BUF

Baltimore to Buffalo: 1,730 nonstop flights a year

On time (12 months)

75%

Cancelled

1.7%

avg delay 14 min

Best time to leave

Before 9 AM

91% on time vs 54% after 9 PM

Most reliable airline

Southwest

74% chance on time

Check BWI to BUF fares

Lowest nonstop fare seen in the next two months: $355 (Southwest 973 on 2026-10-26). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Best trips

11 nonstop. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.

  1. Best overall#1 · Nonstop · 1h 15m

    6:35 AM → 7:50 AM

    88%

    arrive on time

    6:35 AM BWI → 7:50 AM BUF1h 15m

    Southwest 910 · also flew as 1295

    Boeing 737 MAX 8 or 737-800 · 1–22 yrs old
    89% on time · 1.1% cancel
    Find Southwest 910 fares Opens this date on Aviasales

  2. #2 · Nonstop · 1h 15m

    10:45 AM → 12:00 PM

    87%

    arrive on time

    10:45 AM BWI → 12:00 PM BUF1h 15m

    Southwest 1076

    Boeing 737-800 or 737 MAX 8 · 2–20 yrs old
    88% on time · 1.3% cancel
    Find Southwest 1076 fares Opens this date on Aviasales

  3. #3 · Nonstop · 1h 15m

    10:25 AM → 11:40 AM

    84%

    arrive on time

    10:25 AM BWI → 11:40 AM BUF1h 15m

    Southwest 754

    Boeing 737-700 · 8–23 yrs old
    86% on time · 1.4% cancel
    Find Southwest 754 fares Opens this date on Aviasales

  4. #4 · Nonstop · 1h 15m

    1:20 PM → 2:35 PM

    76%

    arrive on time

    1:20 PM BWI → 2:35 PM BUF1h 15m

    Southwest 342

    Boeing 737-700 · 19–22 yrs old
    78% on time · 1.5% cancel
    Find Southwest 342 fares Opens this date on Aviasales

  5. #5 · Nonstop · 1h 20m

    6:25 PM → 7:45 PM

    71%

    arrive on time

    6:25 PM BWI → 7:45 PM BUF1h 20m

    Southwest 2737

    Boeing 737-700 · 17–23 yrs old
    72% on time · 1.3% cancel
    Find Southwest 2737 fares Opens this date on Aviasales

  6. #6 · Nonstop · 1h 15m

    3:25 PM → 4:40 PM

    70%

    arrive on time

    3:25 PM BWI → 4:40 PM BUF1h 15m

    Southwest 1427

    Boeing 737 MAX 8 or 737-800 · 3–11 yrs old
    71% on time · 1.4% cancel
    Find Southwest 1427 fares Opens this date on Aviasales

  7. #7 · Nonstop · 1h 15m

    4:20 PM → 5:35 PM

    68%

    arrive on time

    4:20 PM BWI → 5:35 PM BUF1h 15m

    Southwest 3345

    Boeing 737 MAX 8 or 737-800 · 1–14 yrs old
    69% on time · 2.0% cancel
    Find Southwest 3345 fares Opens this date on Aviasales

  8. #8 · Nonstop · 1h 20m

    7:20 PM → 8:40 PM

    68%

    arrive on time

    7:20 PM BWI → 8:40 PM BUF1h 20m

    Southwest 3972 · also flew as 2159

    Boeing 737-700 or 737 MAX 8 · 1–23 yrs old
    69% on time · 1.4% cancel
    Find Southwest 3972 fares Opens this date on Aviasales

  9. #9 · Nonstop · 1h 15m

    6:00 PM → 7:15 PM

    62%

    arrive on time

    6:00 PM BWI → 7:15 PM BUF1h 15m

    Southwest 4072 · also flew as 2211

    Boeing 737 MAX 8 or 737-700 · 1–21 yrs old
    63% on time · 1.5% cancel
    Find Southwest 4072 fares Opens this date on Aviasales

  10. #10 · Nonstop · 1h 20m

    10:00 PM → 11:20 PM

    57%

    arrive on time

    10:00 PM BWI → 11:20 PM BUF1h 20m

    Southwest 3769

    Boeing 737 MAX 8 or 737-800 · 1–12 yrs old
    58% on time · 1.3% cancel
    Find Southwest 3769 fares Opens this date on Aviasales

Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes.

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines74%

    1,730 flights · 75% on time as flown · 1.7% cancel

On time by departure time

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

  • Before 9 AM91%

    352 flights · avg delay 4 min

  • 9 AM to noon90%

    359 flights · avg delay 5 min

  • Noon to 3 PM70%

    211 flights · avg delay 17 min

  • 3 to 6 PM70%

    255 flights · avg delay 16 min

  • 6 to 9 PM67%

    286 flights · avg delay 24 min

  • After 9 PM54%

    267 flights · avg delay 26 min

Best day: Tuesday (76%). Worst: Saturday (70%).

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