Route on-time record
BUF to BWI: most on-time flights and the best time to fly
Buffalo (Buffalo Niagara International Airport) to Baltimore (Baltimore/Washington International Thurgood Marshall Airport). 1,732 nonstop flights in Jun 2025 to May 2026, 86% arrived within 15 minutes and 1.6% were cancelled. The most reliable flight number was Southwest 914 at 5:45 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
BUF → BWI
Buffalo to Baltimore: 1,732 nonstop flights a year
On time (12 months)
86%
Cancelled
1.6%
avg delay 9 min
Best time to leave
Before 9 AM
94% on time vs 57% 6 to 9 PM
Most reliable airline
Southwest
85% chance on time
Lowest nonstop fare seen in the next two months: $438 (Southwest 830 on 2026-10-18). 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 914
5:45 AM → 7:00 AM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
96%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% 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: 94% on time; 6 to 9 PM: 57%).
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 914 fares Opens this date on Aviasales#2 · Southwest 1272
6:00 AM → 7:20 AM1h 20m nonstop
Local times, typical schedule. Last flown 2026-04-06.
91%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 94% 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: 94% on time; 6 to 9 PM: 57%).
- Short track record (33 flights), so its score leans on the airline's record at this hour.
Limited track record · 33 flights
Find Southwest 1272 fares Opens this date on Aviasales#3 · Southwest 1279
9:10 AM → 10:25 AM1h 15m nonstop
Local times, typical schedule. Last flown 2026-04-06.
91%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 96% of the time (23 flights, Jun 2025 to May 2026).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 1279 fares Opens this date on Aviasales#4 · Southwest 921
12:40 PM → 1:55 PM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-30.
89%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 94% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Short track record (47 flights), so its score leans on the airline's record at this hour.
Limited track record · 47 flights
Find Southwest 921 fares Opens this date on Aviasales#5 · Southwest 1093
11:05 AM → 12:15 PM1h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 537; its record covers all of them.
88%
chance on time
- On time (history)
- 96%
- Cancelled
- 4.2%
- Avg arrival delay
- 2 min
- Arrived on time 96% of the time (23 flights, Jun 2025 to May 2026).
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 1093 fares Opens this date on Aviasales#6 · Southwest 920
9:20 AM → 10:30 AM1h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 89% of the time (54 flights, Jun 2025 to May 2026).
- Never cancelled in 54 scheduled flights.
- Short track record (54 flights), so its score leans on the airline's record at this hour.
Limited track record · 54 flights
Find Southwest 920 fares Opens this date on Aviasales#7 · Southwest 669
1:20 PM → 2:35 PM1h 15m nonstop
Local times, typical schedule. Last flown 2026-04-05.
86%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 89% of the time (18 flights, Jun 2025 to May 2026).
- 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 (18 flights), so its score leans on the airline's record at this hour.
Limited track record · 18 flights
Find Southwest 669 fares Opens this date on Aviasales#8 · Southwest 3490
11:20 AM → 12:30 PM1h 10m nonstop
Local times, typical schedule. Last flown 2026-04-06.
86%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 87% of the time (23 flights, Jun 2025 to May 2026).
- 74% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 3490 fares Opens this date on Aviasales#9 · Southwest 694
4:00 PM → 5:15 PM1h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2436; its record covers all of them.
81%
chance on time
- On time (history)
- 83%
- Cancelled
- 1.6%
- Avg arrival delay
- 11 min
- Arrived on time 83% of the time (60 flights, Jun 2025 to May 2026).
- Lands inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 60 flights
Find Southwest 694 fares Opens this date on Aviasales#10 · Southwest 658
12:25 PM → 1:35 PM1h 10m nonstop
Local times, typical schedule. Last flown 2026-04-05.
80%
chance on time
- On time (history)
- 67%
- Cancelled
- 0.0%
- Avg arrival delay
- 21 min
- Arrived on time 67% of the time (18 flights, Jun 2025 to May 2026).
- Short track record (18 flights), so its score leans on the airline's record at this hour.
Limited track record · 18 flights
Find Southwest 658 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines85%
1,732 flights · 86% on time as flown · 1.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM94%
623 flights · avg delay 4 min
- 9 AM to noon92%
251 flights · avg delay 5 min
- Noon to 3 PM85%
371 flights · avg delay 10 min
- 3 to 6 PM75%
422 flights · avg delay 16 min
- 6 to 9 PM57%
65 flights · avg delay 28 min
Best day: Tuesday (90%). Worst: Thursday (83%).
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%
- Air traffic control and airport volume28%
- Airline (crew, maintenance, boarding)24%
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
BUF to BWI questions
- What time of day is best to fly BUF to BWI?
- Before 9 AM: 94% of flights arrived on time, against 57% 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 BUF to BWI?
- Southwest, with a season-adjusted 85% chance of operating and arriving on time over 1,732 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 BUF to BWI?
- July (76% on time); the best was September (91%), 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 BUF
- BWI to BUF (return)
- BUF to ORD 73%
- BUF to LGA 77%
- BUF to MCO 76%
- BUF to ATL 80%
- BUF to CLT 78%
- BUF to JFK 79%
- BUF to DCA 65%
- BUF to BOS 74%
- BUF to DTW 81%
- BUF to MDW 78%
- BUF to TPA 77%
- BUF to DEN 80%
Live status: FAA delays and ground stops