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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.

DEN → SFO

Denver to San Francisco: 5,391 nonstop flights a year

On time (12 months)

68%

Cancelled

0.5%

avg delay 21 min

Best time to leave

Before 9 AM

80% on time vs 50% 6 to 9 PM

Most reliable airline

United

73% chance on time

Check DEN to SFO fares

Lowest nonstop fare seen in the next two months: $100 (Frontier 1229 on 2026-11-24). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Best trips

14 nonstop, 32 with 1 connection. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.

  1. Best overall#1 · Nonstop · 2h 50m

    5:15 AM → 7:05 AM

    94%

    arrive on time

    5:15 AM DEN → 7:05 AM SFO2h 50m

    United 2367

    Boeing 737 MAX 8 or 737 MAX 9 · 1–11 yrs old
    94% on time · 0.1% cancel
    Find United 2367 fares Opens this date on Aviasales

  2. #2 · Nonstop · 2h 58m

    5:25 AM → 7:23 AM

    93%

    arrive on time

    5:25 AM DEN → 7:23 AM SFO2h 58m

    United 275

    Boeing 737 MAX 9 · 0–12 yrs old
    93% on time · 0.4% cancel
    Find United 275 fares Opens this date on Aviasales

  3. #3 · Nonstop · 2h 38m

    6:00 AM → 7:38 AM

    92%

    arrive on time

    6:00 AM DEN → 7:38 AM SFO2h 38m

    United 694

    Boeing 737 MAX 8 or 737-800 · 3–22 yrs old
    92% on time · 0.4% cancel
    Find United 694 fares Opens this date on Aviasales

  4. #4 · Nonstop · 2h 51m

    3:55 PM → 5:46 PM

    77%

    arrive on time

    3:55 PM DEN → 5:46 PM SFO2h 51m

    United 2633

    Airbus A321neo · 1–25 yrs old
    78% on time · 0.9% cancel
    Find United 2633 fares Opens this date on Aviasales

  5. #5 · Nonstop · 2h 52m

    1:40 PM → 3:32 PM

    76%

    arrive on time

    1:40 PM DEN → 3:32 PM SFO2h 52m

    United 1812

    Airbus A321neo · 1–3 yrs old
    76% on time · 0.1% cancel
    Find United 1812 fares Opens this date on Aviasales

  6. #6 · Nonstop · 2h 54m

    11:21 AM → 1:15 PM

    76%

    arrive on time

    11:21 AM DEN → 1:15 PM SFO2h 54m

    United 1561

    Airbus A321neo · 1–2 yrs old
    76% on time · 0.2% cancel
    Find United 1561 fares Opens this date on Aviasales

  7. #7 · Nonstop · 2h 55m

    9:52 AM → 11:47 AM

    76%

    arrive on time

    9:52 AM DEN → 11:47 AM SFO2h 55m

    Frontier 1229

    Airbus A320neo · 0–9 yrs old
    76% on time · 0.4% cancel
    Find Frontier 1229 fares Opens this date on Aviasales

  8. #8 · Nonstop · 2h 51m

    7:39 AM → 9:30 AM

    73%

    arrive on time

    7:39 AM DEN → 9:30 AM SFO2h 51m

    United 2391

    Boeing 777-200 or Airbus A321neo · 1–30 yrs old
    73% on time · 0.4% cancel
    Find United 2391 fares Opens this date on Aviasales

  9. #9 · Nonstop · 2h 50m

    4:56 PM → 6:46 PM

    73%

    arrive on time

    4:56 PM DEN → 6:46 PM SFO2h 50m

    United 2070

    Boeing 737 MAX 9 · 0–4 yrs old
    73% on time · 0.4% cancel
    Find United 2070 fares Opens this date on Aviasales

  10. #10 · 1 connection · 7h 05m · one ticket (United)

    11:33 AM → 5:37 PM

    98%

    connections made

    86%

    arrive on time

    11:33 AM DEN → 12:36 PM PHX2h 04m

    United 1686

    Airbus A321neo or Boeing 737 MAX 9 · 0–12 yrs old
    83% on time · 0.1% cancel
    Connect in PHX · 2h 44m · 99% chance to make it · same ticket: the airline rebooks you if you miss it

    3:20 PM PHX → 5:37 PM SFO2h 17m

    United 1944

    Boeing 737 MAX 9 · 1–28 yrs old
    88% on time · 0.5% cancel
    Find this United trip Look for United 1686 + United 1944 on Aviasales

Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes.

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines73%

    3,367 flights · 73% on time as flown · 0.4% cancel

  • Frontier Airlines70%

    565 flights · 71% on time as flown · 0.8% cancel

  • Southwest Airlines56%

    1,459 flights · 56% on time as flown · 0.6% cancel

On time by departure time

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

  • Before 9 AM80%

    1,151 flights · avg delay 12 min

  • 9 AM to noon70%

    918 flights · avg delay 16 min

  • Noon to 3 PM73%

    613 flights · avg delay 17 min

  • 3 to 6 PM71%

    958 flights · avg delay 21 min

  • 6 to 9 PM50%

    921 flights · avg delay 37 min

  • After 9 PM62%

    830 flights · avg delay 23 min

Best day: Tuesday (76%). Worst: Thursday (65%).

Smarter routing

Nearby airports that run more on time

  • DEN → SJC 74% chance on time

    Denver International Airport to Norman Y. Mineta San Jose International Airport · 2,599 flights a year · 30 mi from your airports · yours: 68%

    Rank flightsFares

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