Route on-time record
SFO to BWI: most on-time flights and the best time to fly
San Francisco (San Francisco International Airport) to Baltimore (Baltimore/Washington International Thurgood Marshall Airport). 1,112 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was United 1340 at 10:40 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SFO → BWI
San Francisco to Baltimore: 1,112 nonstop flights a year
On time (12 months)
82%
Cancelled
0.6%
avg delay 10 min
Best time to leave
Before 9 AM
96% on time vs 78% noon to 3 PM
Most reliable airline
United
87% chance on time
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 · United 1340
10:40 PM → 7:10 AM5h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2866; its record covers all of them.
91%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 92% of the time (51 flights, Jun 2025 to May 2026).
- Never cancelled in 51 scheduled flights.
- Departs outside SFO's trouble window (7 AM to 1 PM, when 60% of its 334 ground stops and delay programs started).
Limited track record · 51 flights
Find United 1340 fares Opens this date on Aviasales#2 · United 2664
8:39 AM → 5:13 PM5h 33m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.6%
- Avg arrival delay
- 7 min
- Arrived on time 88% of the time (338 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 96% on time; Noon to 3 PM: 78%).
- Departs inside SFO's trouble window: 60% of its 334 ground stops and delay programs started between 7 AM and 1 PM.
- Lands inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
Strong track record · 338 flights
Find United 2664 fares Opens this date on Aviasales#3 · Southwest 4209
9:15 PM → 5:30 AM5h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
58%
chance on time
- On time (history)
- 55%
- Cancelled
- 0.0%
- Avg arrival delay
- 22 min
- Arrived on time 55% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Departs outside SFO's trouble window (7 AM to 1 PM, when 60% of its 334 ground stops and delay programs started).
- 85% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 55 flights
Find Southwest 4209 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines87%
751 flights · 88% on time as flown · 0.5% cancel
- Southwest Airlines70%
361 flights · 69% on time as flown · 0.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM96%
53 flights · avg delay 2 min
- 9 AM to noon86%
293 flights · avg delay 8 min
- Noon to 3 PM78%
36 flights · avg delay 16 min
- After 9 PM79%
714 flights · avg delay 11 min
Best day: Saturday (87%). Worst: Thursday (82%).
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 aircraft59%
- Airline (crew, maintenance, boarding)27%
- Air traffic control and airport volume13%
- Severe weather1%
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
SFO to BWI questions
- What time of day is best to fly SFO to BWI?
- Before 9 AM: 96% of flights arrived on time, against 78% for departures noon to 3 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 SFO to BWI?
- United, with a season-adjusted 87% chance of operating and arriving on time over 751 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 SFO to BWI?
- June (78% on time); the best was January (92%), 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 SFO
- BWI to SFO (return)
- SFO to LAX 76%
- SFO to SEA 74%
- SFO to JFK 80%
- SFO to SAN 68%
- SFO to LAS 76%
- SFO to ORD 77%
- SFO to DEN 76%
- SFO to SNA 81%
- SFO to PHX 76%
- SFO to BOS 78%
- SFO to EWR 76%
- SFO to DFW 75%
Most on-time flights from SFO on every route →
Live status: FAA delays and ground stops