Find a better flight
US domestic flights only at this time
Filter by
Filters apply to trips matching your advanced settings.
Departing flights
Ranking & search details
5 nonstop · ranked by overall best · 4 hidden by your Most reliable time setting (they leave at other times of day)
Most reliable time: afternoon departures (2–6 PM), the window with the best on-time odds for this trip. Turn off “Most reliable” under Departure time in Advanced settings to see every time.
Fares seen on this date: nonstop from 368 · any route from 274 (recent searches, one way, per person; each card opens the live price)
1 matching trip
Why this is our top pick
- This afternoon flight leaves in the most reliable time of day on this route: its best departures have an 86% reliability rating vs 69% for night departures.
- Legroom was comparable across the flights we compared (31 in), so it didn't set them apart.
Aircraft and legroom reflect the planes each flight has flown recently. Airlines can swap planes and seat maps change, so check the airline’s seat map when you book.
BWI → PWM
Baltimore to Portland: 1,342 nonstop flights a year
On time (12 months)
78%
Cancelled
1.3%
avg delay 12 min
Best time to leave
Before 9 AM
94% on time vs 60% after 9 PM
Most reliable airline
Southwest
77% chance on time
Lowest nonstop fare seen in the next two months: $368 (Southwest 4503 on 2026-10-29). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines77%
1,342 flights · 78% on time as flown · 1.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM94%
104 flights · avg delay 3 min
- 9 AM to noon90%
318 flights · avg delay 5 min
- Noon to 3 PM79%
330 flights · avg delay 12 min
- 3 to 6 PM68%
178 flights · avg delay 19 min
- 6 to 9 PM82%
143 flights · avg delay 10 min
- After 9 PM60%
269 flights · avg delay 21 min
Best day: Wednesday (81%). Worst: Sunday (68%).
Smarter routing
Nearby airports that run more on time
IAD → PWM 84% chance on time
Washington Dulles International Airport to Portland International Jetport · 821 flights a year · 45 mi from your airports · yours: 77%
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