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Reliable Flight Search

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The insider way to pick a flight: on-time records, the odds each connection is made, legroom and the age of the planes that actually fly the route. Things airline sites and the big booking sites don’t show you. US airlines and airports.

Find me the most reliable flights fromtoonreturning(optional)

CLT → ONT

Charlotte to Ontario: 327 nonstop flights a year

On time (12 months)

75%

Cancelled

0.9%

avg delay 18 min

Best time to leave

3 to 6 PM

91% on time vs 73% 6 to 9 PM

Most reliable airline

American

75% chance on time

Check CLT to ONT fares

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

Best trips

3 nonstop, 40 with 1 connection · ranked by overall best · published legroom for 15 of 43

  1. Top pick#1 · Nonstop · 5h 24m

    7:00 PM → 9:24 PM

    78

    score

    80%

    arrive on time

    7:00 PM CLT → 9:24 PM ONT5h 24m

    American 1920

    Airbus A321 · 10–25 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    81% on time · 1.1% cancel
    Find American 1920 fares Opens this date on Aviasales

  2. #2 · 1 connection · 8h 16m · one ticket (American)

    11:01 AM → 4:17 PM

    75

    score

    94%

    connections made

    89%

    arrive on time

    11:01 AM CLT → 1:44 PM SLC4h 43m

    American 3166

    Airbus A321 · 9–18 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    81% on time · 1.1% cancel
    Connect in SLC · 1h 39m · 95% chance to make it · same ticket: the airline rebooks you if you miss it

    3:23 PM SLC → 4:17 PM ONT1h 54m

    SkyWest 3762 · sold as American Eagle

    Embraer E175 · 4–10 yrs oldLegroom: not published for this aircraft and cabin yet
    95% on time · 0.5% cancel
    Find this American trip Look for American 3166 + SkyWest 3762 on Aviasales

  3. #3 · 1 connection · 9h 55m · one ticket (American)

    9:22 AM → 4:17 PM

    74

    score

    98%

    connections made

    93%

    arrive on time

    9:22 AM CLT → 11:49 AM SLC4h 27m

    American 1635

    Airbus A321 · 9–25 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    85% on time · 0.8% cancel
    Connect in SLC · 3h 34m · 100% chance to make it · same ticket: the airline rebooks you if you miss it

    3:23 PM SLC → 4:17 PM ONT1h 54m

    SkyWest 3762 · sold as American Eagle

    Embraer E175 · 4–10 yrs oldLegroom: not published for this aircraft and cabin yet
    95% on time · 0.5% cancel
    Find this American trip Look for American 1635 + SkyWest 3762 on Aviasales

  4. #4 · 1 connection · 7h 46m · one ticket (American)

    11:36 AM → 4:22 PM

    73

    score

    97%

    connections made

    86%

    arrive on time

    11:36 AM CLT → 1:03 PM PHX4h 27m

    American 588

    Airbus A321 · 9–15 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    90% on time · 0.9% cancel
    Connect in PHX · 2h 01m · 98% chance to make it · same ticket: the airline rebooks you if you miss it

    3:04 PM PHX → 4:22 PM ONT1h 18m

    Envoy 4143 · sold as American Eagle

    Embraer E175 · 5–11 yrs oldLegroom: not published for this aircraft and cabin yet
    89% on time · 0.3% cancel
    Find this American trip Look for American 588 + Envoy 4143 on Aviasales

  5. #5 · 1 connection · 10h 18m · one ticket (American)

    8:59 AM → 4:17 PM

    70

    score

    98%

    connections made

    93%

    arrive on time

    8:59 AM CLT → 11:28 AM SLC4h 29m

    American 2602

    Airbus A321 · 7–15 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    79% on time · 1.2% cancel
    Connect in SLC · 3h 55m · 100% chance to make it · same ticket: the airline rebooks you if you miss it

    3:23 PM SLC → 4:17 PM ONT1h 54m

    SkyWest 3762 · sold as American Eagle

    Embraer E175 · 4–10 yrs oldLegroom: not published for this aircraft and cabin yet
    95% on time · 0.5% cancel
    Find this American trip Look for American 2602 + SkyWest 3762 on Aviasales

  6. #6 · 1 connection · 8h 24m · one ticket (American)

    11:01 AM → 4:25 PM

    69

    score

    94%

    connections made

    87%

    arrive on time

    11:01 AM CLT → 1:44 PM SLC4h 43m

    American 3166

    Airbus A321 · 9–18 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    81% on time · 1.1% cancel
    Connect in SLC · 1h 46m · 96% chance to make it · same ticket: the airline rebooks you if you miss it

    3:30 PM SLC → 4:25 PM ONT1h 55m

    SkyWest 3809 · sold as American Eagle · also flew as 3829

    Embraer E175 · 4–18 yrs oldLegroom: not published for this aircraft and cabin yet
    92% on time · 0.4% cancel
    Find this American trip Look for American 3166 + SkyWest 3809 on Aviasales

  7. #7 · Nonstop · 5h 14m

    6:53 PM → 9:07 PM

    68

    score

    75%

    arrive on time

    6:53 PM CLT → 9:07 PM ONT5h 14m

    American 2458

    Airbus A321 · 9–25 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    76% on time · 0.7% cancel
    Find American 2458 fares Opens this date on Aviasales

  8. #8 · 1 connection · 8h 16m · one ticket (American)

    11:06 AM → 4:22 PM

    66

    score

    96%

    connections made

    86%

    arrive on time

    11:06 AM CLT → 12:42 PM PHX4h 36m

    American 1700 · also flew as 2240

    Airbus A321 · 9–24 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    88% on time · 1.5% cancel
    Connect in PHX · 2h 22m · 98% chance to make it · same ticket: the airline rebooks you if you miss it

    3:04 PM PHX → 4:22 PM ONT1h 18m

    Envoy 4143 · sold as American Eagle

    Embraer E175 · 5–11 yrs oldLegroom: not published for this aircraft and cabin yet
    89% on time · 0.3% cancel
    Find this American trip Look for American 1700 + Envoy 4143 on Aviasales

  9. #9 · 1 connection · 10h 03m · one ticket (American)

    9:22 AM → 4:25 PM

    66

    score

    99%

    connections made

    91%

    arrive on time

    9:22 AM CLT → 11:49 AM SLC4h 27m

    American 1635

    Airbus A321 · 9–25 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    85% on time · 0.8% cancel
    Connect in SLC · 3h 41m · 100% chance to make it · same ticket: the airline rebooks you if you miss it

    3:30 PM SLC → 4:25 PM ONT1h 55m

    SkyWest 3809 · sold as American Eagle · also flew as 3829

    Embraer E175 · 4–18 yrs oldLegroom: not published for this aircraft and cabin yet
    92% on time · 0.4% cancel
    Find this American trip Look for American 1635 + SkyWest 3809 on Aviasales

  10. #10 · 1 connection · 10h 26m · one ticket (American)

    8:59 AM → 4:25 PM

    62

    score

    98%

    connections made

    90%

    arrive on time

    8:59 AM CLT → 11:28 AM SLC4h 29m

    American 2602

    Airbus A321 · 7–15 yrs oldLegroom 30–31 in · 16.3–18.7 in wide · Main Cabin
    79% on time · 1.2% cancel
    Connect in SLC · 4h 02m · 100% chance to make it · same ticket: the airline rebooks you if you miss it

    3:30 PM SLC → 4:25 PM ONT1h 55m

    SkyWest 3809 · sold as American Eagle · also flew as 3829

    Embraer E175 · 4–18 yrs oldLegroom: not published for this aircraft and cabin yet
    92% on time · 0.4% cancel
    Find this American trip Look for American 2602 + SkyWest 3809 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. Legroom is the seat pitch the airline or a seat-map source publishes for that aircraft and cabin; we never estimate it, and seat maps change, so check the airline’s seat map when you book.

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • American Airlines75%

    327 flights · 75% on time as flown · 0.9% cancel

On time by departure time

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

  • 3 to 6 PM91%

    32 flights · avg delay 8 min

  • 6 to 9 PM73%

    293 flights · avg delay 19 min

Best day: Tuesday (78%). Worst: Sunday (67%).

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