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Route on-time record

BWI to DEN: most on-time flights and the best time to fly

Baltimore (Baltimore/Washington International Thurgood Marshall Airport) to Denver (Denver International Airport). 2,920 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 1.2% were cancelled. The most reliable flight number was United 2412 at 8:00 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

BWI → DEN

Baltimore to Denver: 2,920 nonstop flights a year

On time (12 months)

76%

Cancelled

1.2%

avg delay 16 min

Best time to leave

Before 9 AM

90% on time vs 63% 3 to 6 PM

Most reliable airline

United

85% chance on time

Check BWI to DEN fares

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. #1 · United 2412

    8:00 AM → 10:08 AM4h 08m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    91%

    chance on time

    On time (history)
    91%
    Cancelled
    0.3%
    Avg arrival delay
    5 min
    • Arrived on time 91% of the time (290 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 63%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Strong track record · 290 flights

    Find United 2412 fares Opens this date on Aviasales

  2. #2 · Southwest 2997

    8:25 AM → 10:40 AM4h 15m nonstop

    Local times, typical schedule. Last flown 2026-04-05.

    86%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 88% of the time (17 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 63%).
    • 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 (17 flights), so its score leans on the airline's record at this hour.

    Limited track record · 17 flights

    Find Southwest 2997 fares Opens this date on Aviasales

  3. #3 · Southwest 481

    9:20 AM → 11:30 AM4h 10m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    83%

    chance on time

    On time (history)
    100%
    Cancelled
    6.7%
    Avg arrival delay
    2 min
    • Arrived on time 100% of the time (14 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 (14 flights), so its score leans on the airline's record at this hour.

    Limited track record · 14 flights

    Find Southwest 481 fares Opens this date on Aviasales

  4. #4 · Southwest 1487

    6:05 AM → 8:15 AM4h 10m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    83%

    chance on time

    On time (history)
    86%
    Cancelled
    4.3%
    Avg arrival delay
    3 min
    • Arrived on time 86% of the time (22 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 63%).
    • 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 1487 fares Opens this date on Aviasales

  5. #5 · Southwest 960

    7:40 AM → 9:40 AM4h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    82%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 87% of the time (47 flights, Jun 2025 to May 2026).
    • Never cancelled in 47 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 63%).
    • Departs outside BWI's trouble window (2 PM to 8 PM, when 81% of its 43 ground stops and delay programs started).

    Limited track record · 47 flights

    Find Southwest 960 fares Opens this date on Aviasales

  6. #6 · Southwest 1371

    7:30 AM → 9:30 AM4h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    79%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 75% of the time (8 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 63%).
    • 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 (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 1371 fares Opens this date on Aviasales

  7. #7 · Southwest 1124

    10:00 AM → 11:55 AM3h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    78%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 82% of the time (45 flights, Jun 2025 to May 2026).
    • Never cancelled in 45 scheduled flights.
    • 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 (45 flights), so its score leans on the airline's record at this hour.

    Limited track record · 45 flights

    Find Southwest 1124 fares Opens this date on Aviasales

  8. #8 · Southwest 1130

    7:20 PM → 9:30 PM4h 10m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    77%

    chance on time

    On time (history)
    85%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 85% of the time (55 flights, Jun 2025 to May 2026).
    • Never cancelled in 55 scheduled flights.
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (55 flights), so its score leans on the airline's record at this hour.

    Limited track record · 55 flights

    Find Southwest 1130 fares Opens this date on Aviasales

  9. #9 · United 2012

    4:18 PM → 6:25 PM4h 12m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    75%

    chance on time

    On time (history)
    74%
    Cancelled
    0.6%
    Avg arrival delay
    23 min
    • Arrived on time 74% of the time (324 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 63% on time; Before 9 AM: 90%).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.
    • Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.

    Strong track record · 324 flights

    Find United 2012 fares Opens this date on Aviasales

  10. #10 · Southwest 468

    4:45 PM → 6:50 PM4h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    69%

    chance on time

    On time (history)
    74%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 74% of the time (46 flights, Jun 2025 to May 2026).
    • Never cancelled in 47 scheduled flights.
    • Leaves in this route's least on-time window (3 to 6 PM: 63% on time; Before 9 AM: 90%).
    • Departs inside BWI's trouble window: 81% of its 43 ground stops and delay programs started between 2 PM and 8 PM.

    Limited track record · 46 flights

    Find Southwest 468 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines85%

    932 flights · 86% on time as flown · 0.6% cancel

  • Southwest Airlines71%

    1,911 flights · 72% on time as flown · 1.5% cancel

  • Frontier Airlines61%

    77 flights · 48% on time as flown · 0.8% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM90%

    889 flights · avg delay 5 min

  • 9 AM to noon87%

    436 flights · avg delay 9 min

  • Noon to 3 PM74%

    353 flights · avg delay 14 min

  • 3 to 6 PM63%

    815 flights · avg delay 29 min

  • 6 to 9 PM64%

    364 flights · avg delay 24 min

Best day: Sunday (78%). Worst: Friday (74%).

Smarter routing

Nearby airports that run more on time

  • IAD → DEN 80% chance on time

    Washington Dulles International Airport to Denver International Airport · 3,624 flights a year · 45 mi from your airports · yours: 75%

    Rank flightsFares

  • DCA → DEN 78% chance on time

    Ronald Reagan Washington National Airport to Denver International Airport · 1,348 flights a year · 30 mi from your airports · yours: 75%

    Rank flightsFares

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.

J
80
F
81
M
79
A
75
M
74
J
68
J
64
A
71
S
83
O
85
N
85
D
79

What delays this route

  • Air traffic control and airport volume35%
  • Late-arriving aircraft28%
  • Airline (crew, maintenance, boarding)28%
  • Severe weather8%

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

BWI to DEN questions

What time of day is best to fly BWI to DEN?
Before 9 AM: 90% of flights arrived on time, against 63% 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 BWI to DEN?
United, with a season-adjusted 85% chance of operating and arriving on time over 932 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 BWI to DEN?
July (64% on time); the best was October (85%), 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 BWI

Live status: FAA delays and ground stops