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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.

SFO → DEN

San Francisco to Denver: 5,384 nonstop flights a year

On time (12 months)

76%

Cancelled

0.5%

avg delay 15 min

Best time to leave

Before 9 AM

90% on time vs 61% 3 to 6 PM

Most reliable airline

United

82% chance on time

Check SFO to DEN fares

Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Best trips

18 nonstop, 27 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 44m

    6:15 AM → 9:59 AM

    95%

    arrive on time

    6:15 AM SFO → 9:59 AM DEN2h 44m

    United 1233

    Airbus A321neo · 0–2 yrs old
    95% on time · 0.2% cancel
    Find United 1233 fares Opens this date on Aviasales

  2. #2 · Nonstop · 2h 40m

    5:00 AM → 8:40 AM

    94%

    arrive on time

    5:00 AM SFO → 8:40 AM DEN2h 40m

    United 1479

    Boeing 757-300 or Airbus A321neo · 1–25 yrs old
    94% on time · 0.2% cancel
    Find United 1479 fares Opens this date on Aviasales

  3. #3 · Nonstop · 2h 48m

    6:45 AM → 10:33 AM

    94%

    arrive on time

    6:45 AM SFO → 10:33 AM DEN2h 48m

    United 1315 · also flew as 2234

    Boeing 737 MAX 8 or 737 MAX 9 · 0–8 yrs old
    95% on time · 0.2% cancel
    Find United 1315 fares Opens this date on Aviasales

  4. #4 · Nonstop · 2h 35m

    5:25 AM → 9:00 AM

    92%

    arrive on time

    5:25 AM SFO → 9:00 AM DEN2h 35m

    Southwest 321 · also flew as 860

    Boeing 737 MAX 8 or 737-800 · 1–22 yrs old
    92% on time · 0.9% cancel
    Find Southwest 321 fares Opens this date on Aviasales

  5. #5 · Nonstop · 2h 41m

    6:00 AM → 9:41 AM

    90%

    arrive on time

    6:00 AM SFO → 9:41 AM DEN2h 41m

    United 513

    Boeing 737-900ER · 1–28 yrs old
    91% on time · 0.8% cancel
    Find United 513 fares Opens this date on Aviasales

  6. #6 · Nonstop · 2h 49m

    8:20 AM → 12:09 PM

    88%

    arrive on time

    8:20 AM SFO → 12:09 PM DEN2h 49m

    United 2348

    Boeing 757-300 · 22–25 yrs old
    88% on time · 0.8% cancel
    Find United 2348 fares Opens this date on Aviasales

  7. #7 · Nonstop · 2h 51m

    8:53 PM → 12:45 AM

    86%

    arrive on time

    8:53 PM SFO → 12:45 AM DEN2h 51m

    United 301

    Boeing 737 MAX 8 or 737 MAX 9 · 1–24 yrs old
    87% on time · 0.2% cancel
    Find United 301 fares Opens this date on Aviasales

  8. #8 · Nonstop · 2h 47m

    6:00 AM → 9:47 AM

    86%

    arrive on time

    6:00 AM SFO → 9:47 AM DEN2h 47m

    Frontier 1230

    Airbus A320neo · 0–9 yrs old
    87% on time · 1.1% cancel
    Find Frontier 1230 fares Opens this date on Aviasales

  9. #9 · Nonstop · 2h 52m

    7:07 PM → 10:59 PM

    86%

    arrive on time

    7:07 PM SFO → 10:59 PM DEN2h 52m

    United 2436

    Airbus A321neo · 1–29 yrs old
    86% on time · 0.2% cancel
    Find United 2436 fares Opens this date on Aviasales

  10. #10 · Nonstop · 2h 43m

    8:45 AM → 12:28 PM

    83%

    arrive on time

    8:45 AM SFO → 12:28 PM DEN2h 43m

    United 1023

    Boeing 757-300 · 22–25 yrs old
    84% on time · 0.3% cancel
    Find United 1023 fares Opens this date 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 Airlines82%

    3,364 flights · 82% on time as flown · 0.3% cancel

  • Frontier Airlines75%

    565 flights · 76% on time as flown · 0.9% cancel

  • Southwest Airlines62%

    1,455 flights · 62% 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%

    2,053 flights · avg delay 7 min

  • 9 AM to noon68%

    549 flights · avg delay 17 min

  • Noon to 3 PM62%

    1,213 flights · avg delay 22 min

  • 3 to 6 PM61%

    635 flights · avg delay 26 min

  • 6 to 9 PM79%

    770 flights · avg delay 15 min

  • After 9 PM74%

    164 flights · avg delay 18 min

Best day: Tuesday (81%). Worst: Friday (74%).

Smarter routing

Nearby airports that run more on time

  • SJC → DEN 81% chance on time

    Norman Y. Mineta San Jose International Airport to Denver International Airport · 2,594 flights a year · 30 mi from your airports · yours: 76%

    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