Find the flight least likely to be delayed

1. Best overall#1 · Nonstop · 2h 45m

   10:54 AM → 1:39 PM

   93%

   arrive on time

   10:54 AM SEA → 1:39 PM ONT2h 45m

   SkyWest 4170 · sold as United Express, Delta Connection, American Eagle or Alaska

   Embraer E175 · 4–19 yrs old

   93% on time · 0.4% cancel
   Why this ranks here

   Find 10:54 AM flight fares ↗Opens this date on Aviasales

2. #2 · Nonstop · 2h 50m

   9:45 AM → 12:35 PM

   92%

   arrive on time

   9:45 AM SEA → 12:35 PM ONT2h 50m

   SkyWest 3840 · sold as United Express, Delta Connection, American Eagle or Alaska

   Embraer E175 · 4–18 yrs old

   92% on time · 0.4% cancel
   Why this ranks here

   Find 9:45 AM flight fares ↗Opens this date on Aviasales

3. #3 · Nonstop · 2h 43m

   2:30 PM → 5:13 PM

   90%

   arrive on time

   2:30 PM SEA → 5:13 PM ONT2h 43m

   SkyWest 4031 · sold as United Express, Delta Connection, American Eagle or Alaska

   Embraer E175 · 4–19 yrs old

   90% on time · 0.3% cancel
   Why this ranks here

   Find 2:30 PM flight fares ↗Opens this date on Aviasales

4. #4 · Nonstop · 2h 44m

   7:50 PM → 10:34 PM

   88%

   arrive on time

   7:50 PM SEA → 10:34 PM ONT2h 44m

   SkyWest 3884 · sold as United Express, Delta Connection, American Eagle or Alaska · also flew as 3709, 4027

   Embraer E175 · 4–19 yrs old

   88% on time · 0.3% cancel
   Why this ranks here

   Find 7:50 PM flight fares ↗Opens this date on Aviasales

5. #5 · Nonstop · 2h 39m

   7:00 AM → 9:39 AM

   85%

   arrive on time

   7:00 AM SEA → 9:39 AM ONT2h 39m

   Alaska 1364

   Boeing 737-900ER or 737 MAX 9 · 2–16 yrs old

   88% on time · 3.0% cancel
   Why this ranks here

   Find Alaska 1364 fares ↗Opens this date on Aviasales

6. #6 · Nonstop · 2h 48m

   8:30 AM → 11:18 AM

   86%

   arrive on time

   8:30 AM SEA → 11:18 AM ONT2h 48m

   SkyWest 4070 · sold as United Express, Delta Connection, American Eagle or Alaska

   Embraer E175 · 4–10 yrs old

   86% on time · 0.3% cancel
   Why this ranks here

   Find 8:30 AM flight fares ↗Opens this date on Aviasales

7. #7 · Nonstop · 2h 44m

   11:51 AM → 2:35 PM

   84%

   arrive on time

   11:51 AM SEA → 2:35 PM ONT2h 44m

   Frontier 2276

   Airbus A321neo · 1–11 yrs old

   85% on time · 1.1% cancel
   Why this ranks here

   Find Frontier 2276 fares ↗Opens this date on Aviasales

8. #8 · Nonstop · 2h 54m

   11:38 AM → 2:32 PM

   82%

   arrive on time

   11:38 AM SEA → 2:32 PM ONT2h 54m

   Alaska 728

   Boeing 737 MAX 9 or 737-900ER · 2–17 yrs old

   84% on time · 1.6% cancel
   Why this ranks here

   Find Alaska 728 fares ↗Opens this date on Aviasales

9. #9 · 1 connection · 4h 50m · one ticket (Southwest)

   5:45 AM → 10:35 AM

   95%

   connections made

   88%

   arrive on time

   5:45 AM SEA → 7:30 AM SMF1h 45m

   Southwest 733

   Boeing 737-700 · 15–23 yrs old

   88% on time · 0.4% cancel

   Connect in SMF · 1h 40m · 96% chance to make it · same ticket: the airline rebooks you if you miss it

   9:10 AM SMF → 10:35 AM ONT1h 25m

   Southwest 4489

   Boeing 737-700 · 18–22 yrs old

   93% on time · 0.2% cancel
   Why this ranks here

   Find this Southwest trip ↗Look for Southwest 733 + Southwest 4489 on Aviasales

10. #10 · 1 connection · 5h 25m · one ticket (Southwest)

    5:00 AM → 10:25 AM

    97%

    connections made

    90%

    arrive on time

    5:00 AM SEA → 6:50 AM SMF1h 50m

    Southwest 2862 · also flew as 1738

    Boeing 737-700 · 4–23 yrs old

    88% on time · 1.1% cancel

    Connect in SMF · 2h 10m · 98% chance to make it · same ticket: the airline rebooks you if you miss it

    9:00 AM SMF → 10:25 AM ONT1h 25m

    Southwest 4226

    Boeing 737-700 or 737 MAX 8 · 4–22 yrs old

    93% on time · 0.2% cancel
    Why this ranks here

    Find this Southwest trip ↗Look for Southwest 2862 + Southwest 4226 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.