ATIS Alerts Smart Flight Search
Find the flight least likely to be delayed
BetaWe 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 → BOS
Baltimore to Boston: 3,613 nonstop flights a year
On time (12 months)
74%
Cancelled
2.8%
avg delay 19 min
Best time to leave
Before 9 AM
93% on time vs 56% after 9 PM
Most reliable airline
Republic
78% chance on time
Lowest nonstop fare seen in the next two months: $52 (Southwest 4725 on 2026-11-24). 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 942
8:20 AM → 10:00 AM1h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1435; its record covers all of them.
93%
chance on time
- On time (history)
- 100%
- Cancelled
- 1.6%
- Avg arrival delay
- 1 min
- Arrived on time 100% of the time (60 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 93% on time; After 9 PM: 56%).
- 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 · 60 flights
Find Southwest 942 fares Opens this date on Aviasales#2 · Southwest 1058
6:35 AM → 8:05 AM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2229; its record covers all of them.
89%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 92% 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: 93% on time; After 9 PM: 56%).
- 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 1058 fares Opens this date on Aviasales#3 · Republic 5703 · sold as American Eagle, Delta Connection or United Express
10:54 AM → 12:26 PM1h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 90%
- Cancelled
- 3.0%
- Avg arrival delay
- 10 min
- Arrived on time 90% of the time (160 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (5 of 165).
- Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
- Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
Moderate track record · 160 flights
Find 10:54 AM flight fares Opens this date on Aviasales#4 · Southwest 1062
10:40 AM → 12:10 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 138; its record covers all of them.
86%
chance on time
- On time (history)
- 90%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 90% of the time (87 flights, Jun 2025 to May 2026).
- Never cancelled in 88 scheduled flights.
- Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).
- Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
Moderate track record · 87 flights
Find Southwest 1062 fares Opens this date on Aviasales#5 · Spirit 900
6:35 AM → 7:58 AM1h 23m nonstop
Local times, typical schedule. Last flown 2026-05-01.
84%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 91% of the time (11 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 93% on time; After 9 PM: 56%).
- 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 (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find Spirit 900 fares Opens this date on Aviasales#6 · Republic 5668 · sold as American Eagle, Delta Connection or United Express
3:35 PM → 5:09 PM1h 42m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 82%
- Cancelled
- 4.2%
- Avg arrival delay
- 11 min
- Arrived on time 82% of the time (138 flights, Jun 2025 to May 2026).
- Cancelled 4.2% of the time (6 of 144).
- Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
- Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
Moderate track record · 138 flights
Find 3:35 PM flight fares Opens this date on Aviasales#7 · Southwest 548
12:05 PM → 1:35 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-30.
76%
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).
- Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 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 548 fares Opens this date on Aviasales#8 · Southwest 2555
8:15 PM → 9:50 PM1h 35m nonstop
Local times, typical schedule. Last flown 2026-05-29.
67%
chance on time
- On time (history)
- 73%
- Cancelled
- 4.3%
- Avg arrival delay
- 13 min
- Arrived on time 73% of the time (22 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 (22 flights), so its score leans on the airline's record at this hour.
Limited track record · 22 flights
Find Southwest 2555 fares Opens this date on Aviasales#9 · Southwest 4346
3:45 PM → 5:15 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
66%
chance on time
- On time (history)
- 65%
- Cancelled
- 0.0%
- Avg arrival delay
- 29 min
- Arrived on time 65% of the time (23 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.
- Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 PM.
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 4346 fares Opens this date on Aviasales#10 · Southwest 888
1:40 PM → 3:10 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-30.
66%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 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).
- Lands inside BOS's trouble window: 79% of its 196 ground stops and delay programs started between noon and 6 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 888 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Republic Airways (sold as American Eagle, Delta Connection or United Express)78%
1,083 flights · 80% on time as flown · 3.1% cancel
- Southwest Airlines70%
2,381 flights · 72% on time as flown · 2.6% cancel
- Spirit Airlines67%
149 flights · 65% on time as flown · 3.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM93%
832 flights · avg delay 4 min
- 9 AM to noon88%
703 flights · avg delay 8 min
- Noon to 3 PM67%
569 flights · avg delay 22 min
- 3 to 6 PM59%
623 flights · avg delay 33 min
- 6 to 9 PM63%
557 flights · avg delay 29 min
- After 9 PM56%
329 flights · avg delay 30 min
Best day: Wednesday (79%). Worst: Sunday (71%).
Smarter routing
Nearby airports that run more on time
BWI → MHT 81% chance on time
Baltimore/Washington International Thurgood Marshall Airport to Manchester-Boston Regional Airport · 1,710 flights a year · 45 mi from your airports · yours: 72%
BWI → PVD 77% chance on time
Baltimore/Washington International Thurgood Marshall Airport to Rhode Island T. F. Green International Airport · 1,882 flights a year · 49 mi from your airports · yours: 72%
IAD → BOS 74% chance on time
Washington Dulles International Airport to Boston Logan International Airport · 1,487 flights a year · 45 mi from your airports · yours: 72%
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