Route on-time record
GRR to BWI: most on-time flights and the best time to fly
Grand Rapids (Gerald R. Ford International Airport) to Baltimore (Baltimore/Washington International Thurgood Marshall Airport). 423 nonstop flights in Jun 2025 to May 2026, 81% arrived within 15 minutes and 1.2% were cancelled. The most reliable flight number was Southwest 1523 at 8:25 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
GRR → BWI
Grand Rapids to Baltimore: 423 nonstop flights a year
On time (12 months)
81%
Cancelled
1.2%
avg delay 12 min
Best time to leave
Before 9 AM
92% on time vs 75% 3 to 6 PM
Most reliable airline
Southwest
80% 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 · Southwest 1523
8:25 AM → 10:00 AM1h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 93% 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: 92% on time; 3 to 6 PM: 75%).
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 1523 fares Opens this date on Aviasales#2 · Southwest 3875
3:05 PM → 4:40 PM1h 35m nonstop
Local times, typical schedule. Last flown 2026-05-30.
81%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 75% on time; Before 9 AM: 92%).
- 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 (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 3875 fares Opens this date on Aviasales#3 · Southwest 1072
3:15 PM → 4:50 PM1h 35m nonstop
Local times, typical schedule. Last flown 2026-04-06.
77%
chance on time
- On time (history)
- 73%
- Cancelled
- 0.0%
- Avg arrival delay
- 26 min
- Arrived on time 73% of the time (22 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 75% on time; Before 9 AM: 92%).
- Lands inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
- 80% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 22 flights
Find Southwest 1072 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines80%
423 flights · 81% on time as flown · 1.2% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
115 flights · avg delay 7 min
- Noon to 3 PM78%
87 flights · avg delay 12 min
- 3 to 6 PM75%
205 flights · avg delay 15 min
Best day: Saturday (87%). Worst: Thursday (75%).
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 aircraft50%
- Airline (crew, maintenance, boarding)28%
- Air traffic control and airport volume20%
- 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
GRR to BWI questions
- What time of day is best to fly GRR to BWI?
- Before 9 AM: 92% of flights arrived on time, against 75% for departures 3 to 6 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 GRR to BWI?
- Southwest, with a season-adjusted 80% chance of operating and arriving on time over 423 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 GRR to BWI?
- March (71% on time); the best was April (96%), 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 GRR
- BWI to GRR (return)
- GRR to ORD 68%
- GRR to DTW 77%
- GRR to ATL 86%
- GRR to DEN 80%
- GRR to MSP 81%
- GRR to DFW 67%
- GRR to CLT 80%
- GRR to LGA 79%
- GRR to MDW 78%
- GRR to EWR 79%
- GRR to DCA 69%
- GRR to LAS 71%
Live status: FAA delays and ground stops