Route on-time record

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

Baltimore (Baltimore/Washington International Thurgood Marshall Airport) to Buffalo (Buffalo Niagara International Airport). 1,730 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 1.7% were cancelled. The most reliable flight number was Southwest 910 at 6:35 AM.

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

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.

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 910
6:35 AM → 7:50 AM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1295; its record covers all of them.
88%
chance on time
On time (history)
89%
Cancelled
0.0%
Avg arrival delay
3 min
- Arrived on time 89% of the time (87 flights, Jun 2025 to May 2026).
- Never cancelled in 87 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 91% on time; After 9 PM: 54%).
- 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 · 87 flights
Find Southwest 910 fares Opens this date on Aviasales
#2 · Southwest 1076
10:45 AM → 12:00 PM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-30.
87%
chance on time
On time (history)
89%
Cancelled
0.0%
Avg arrival delay
4 min
- Arrived on time 89% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
- Short track record (47 flights), so its score leans on the airline's record at this hour.
Limited track record · 47 flights
Find Southwest 1076 fares Opens this date on Aviasales
#3 · Southwest 754
10:25 AM → 11:40 AM1h 15m nonstop
Local times, typical schedule. Last flown 2026-04-06.
84%
chance on time
On time (history)
82%
Cancelled
0.0%
Avg arrival delay
6 min
- Arrived on time 82% 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).
- Short track record (33 flights), so its score leans on the airline's record at this hour.
Limited track record · 33 flights
Find Southwest 754 fares Opens this date on Aviasales
#4 · Southwest 342
1:20 PM → 2:35 PM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-27.
76%
chance on time
On time (history)
94%
Cancelled
0.0%
Avg arrival delay
2 min
- Arrived on time 94% of the time (16 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).
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 342 fares Opens this date on Aviasales
#5 · Southwest 2737
6:25 PM → 7:45 PM1h 20m nonstop
Local times, typical schedule. Last flown 2026-05-29.
71%
chance on time
On time (history)
74%
Cancelled
0.0%
Avg arrival delay
28 min
- Arrived on time 74% of the time (39 flights, Jun 2025 to May 2026).
- Never cancelled in 39 scheduled flights.
- 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 (39 flights), so its score leans on the airline's record at this hour.
Limited track record · 39 flights
Find Southwest 2737 fares Opens this date on Aviasales
#6 · Southwest 1427
3:25 PM → 4:40 PM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-30.
70%
chance on time
On time (history)
65%
Cancelled
0.0%
Avg arrival delay
15 min
- Arrived on time 65% of the time (31 flights, Jun 2025 to May 2026).
- Never cancelled in 31 scheduled flights.
- 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 (31 flights), so its score leans on the airline's record at this hour.
Limited track record · 31 flights
Find Southwest 1427 fares Opens this date on Aviasales
#7 · Southwest 3972
7:20 PM → 8:40 PM1h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2159; its record covers all of them.
68%
chance on time
On time (history)
65%
Cancelled
0.0%
Avg arrival delay
35 min
- Arrived on time 65% of the time (31 flights, Jun 2025 to May 2026).
- Never cancelled in 31 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 · 31 flights
Find Southwest 3972 fares Opens this date on Aviasales
#8 · Southwest 3345
4:20 PM → 5:35 PM1h 15m nonstop
Local times, typical schedule. Last flown 2026-04-06.
68%
chance on time
On time (history)
56%
Cancelled
3.6%
Avg arrival delay
27 min
- Arrived on time 56% of the time (27 flights, Jun 2025 to May 2026).
- 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 (27 flights), so its score leans on the airline's record at this hour.
Limited track record · 27 flights
Find Southwest 3345 fares Opens this date on Aviasales
#9 · Southwest 4072
6:00 PM → 7:15 PM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2211; its record covers all of them.
62%
chance on time
On time (history)
44%
Cancelled
0.0%
Avg arrival delay
31 min
- Arrived on time 44% of the time (16 flights, Jun 2025 to May 2026).
- 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 (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 4072 fares Opens this date on Aviasales
#10 · Southwest 3769
10:00 PM → 11:20 PM1h 20m nonstop
Local times, typical schedule. Last flown 2026-05-30.
57%
chance on time
On time (history)
53%
Cancelled
0.0%
Avg arrival delay
27 min
- Arrived on time 53% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Leaves in this route's least on-time window (After 9 PM: 54% on time; Before 9 AM: 91%).
- 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 · 47 flights
Find Southwest 3769 fares Opens this date on Aviasales

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%).

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 aircraft46%
Airline (crew, maintenance, boarding)35%
Air traffic control and airport volume15%
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 BUF questions

What time of day is best to fly BWI to BUF?: Before 9 AM: 91% of flights arrived on time, against 54% for departures after 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 BWI to BUF?: Southwest, with a season-adjusted 74% chance of operating and arriving on time over 1,730 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 BUF?: July (53% on time); the best was September (82%), 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.

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