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Route on-time record

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

Baltimore (Baltimore/Washington International Thurgood Marshall Airport) to Las Vegas (Harry Reid International Airport). 1,846 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 1.1% were cancelled. The most reliable flight number was Southwest 2661 at 8:45 AM.

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

Find me the most reliable flights fromtoonreturning(optional)

BWI → LAS

Baltimore to Las Vegas: 1,846 nonstop flights a year

On time (12 months)

80%

Cancelled

1.1%

avg delay 13 min

Best time to leave

Before 9 AM

92% on time vs 63% after 9 PM

Most reliable airline

Southwest

78% chance on time

Check BWI to LAS fares

Lowest nonstop fare seen in the next two months: $178 (Southwest 4635 on 2026-11-09). 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 · Southwest 2661

    8:45 AM → 11:10 AM5h 25m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    90%

    chance on time

    On time (history)
    95%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 95% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 92% on time; After 9 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 · 39 flights

    Find Southwest 2661 fares Opens this date on Aviasales

  2. #2 · Southwest 1167

    6:10 AM → 8:25 AM5h 15m nonstop

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

    88%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 89% 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; After 9 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 · 55 flights

    Find Southwest 1167 fares Opens this date on Aviasales

  3. #3 · Southwest 1335

    9:25 AM → 11:45 AM5h 20m nonstop

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

    83%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    4 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 LAS's trouble window: 51% of its 107 ground stops and delay programs started between 10 AM and 4 PM.

    Limited track record · 8 flights

    Find Southwest 1335 fares Opens this date on Aviasales

  4. #4 · Southwest 3892

    11:40 AM → 1:55 PM5h 15m nonstop

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

    81%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 100% 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 LAS's trouble window: 51% of its 107 ground stops and delay programs started between 10 AM and 4 PM.

    Limited track record · 8 flights

    Find Southwest 3892 fares Opens this date on Aviasales

  5. #5 · Southwest 3784

    3:25 PM → 5:45 PM5h 20m nonstop

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

    75%

    chance on time

    On time (history)
    81%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 81% of the time (31 flights, Jun 2025 to May 2026).
    • Never cancelled in 31 scheduled flights.
    • 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 · 31 flights

    Find Southwest 3784 fares Opens this date on Aviasales

  6. #6 · Southwest 3645

    5:10 PM → 7:30 PM5h 20m nonstop

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

    73%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 75% of the time (8 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.

    Limited track record · 8 flights

    Find Southwest 3645 fares Opens this date on Aviasales

  7. #7 · Southwest 3368

    12:50 PM → 3:05 PM5h 15m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    73%

    chance on time

    On time (history)
    72%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 72% of the time (39 flights, Jun 2025 to May 2026).
    • Never cancelled in 39 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 LAS's trouble window: 51% of its 107 ground stops and delay programs started between 10 AM and 4 PM.

    Limited track record · 39 flights

    Find Southwest 3368 fares Opens this date on Aviasales

  8. #8 · Southwest 1171

    9:00 PM → 11:20 PM5h 20m nonstop

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

    72%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    15 min
    • Arrived on time 73% of the time (45 flights, Jun 2025 to May 2026).
    • Never cancelled in 46 scheduled flights.
    • Leaves in this route's least on-time window (After 9 PM: 63% on time; Before 9 AM: 92%).
    • 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 · 45 flights

    Find Southwest 1171 fares Opens this date on Aviasales

  9. #9 · Southwest 2200

    3:55 PM → 6:15 PM5h 20m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    63%

    chance on time

    On time (history)
    50%
    Cancelled
    0.0%
    Avg arrival delay
    22 min
    • Arrived on time 50% of the time (22 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.

    Limited track record · 22 flights

    Find Southwest 2200 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines78%

    1,635 flights · 79% 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%

    613 flights · avg delay 4 min

  • 9 AM to noon87%

    227 flights · avg delay 11 min

  • Noon to 3 PM73%

    247 flights · avg delay 16 min

  • 3 to 6 PM72%

    281 flights · avg delay 19 min

  • 6 to 9 PM70%

    410 flights · avg delay 20 min

  • After 9 PM63%

    68 flights · avg delay 17 min

Best day: Tuesday (80%). Worst: Friday (74%).

Smarter routing

Nearby airports that run more on time

  • IAD → LAS 84% chance on time

    Washington Dulles International Airport to Harry Reid International Airport · 1,129 flights a year · 45 mi from your airports · yours: 79%

    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
76
F
80
M
78
A
75
M
76
J
71
J
60
A
74
S
81
O
84
N
88
D
80

What delays this route

  • Late-arriving aircraft36%
  • Airline (crew, maintenance, boarding)31%
  • Air traffic control and airport volume21%
  • Severe weather11%
  • Security2%

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

Finding the most reliable connections from BWI to LAS…

BWI to LAS questions

What time of day is best to fly BWI to LAS?
Before 9 AM: 92% of flights arrived on time, against 63% for departures after 9 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 LAS?
Southwest, with a season-adjusted 78% chance of operating and arriving on time over 1,635 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 LAS?
July (60% on time); the best was November (88%), 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

Most on-time flights from BWI on every route →

Live status: FAA delays and ground stops