Drive or Fly: Fremont, CA to Diamond Bar, CA?
Side-by-side comparison of driving versus flying for this route. Costs, time, and trade-offs at a glance.
Driving wins
MediumNo scheduled commercial flights found for SJC–ONT. At 382 miles, driving is the only practical option.
Drive
Door to Door
7h 14m
Distance
382.5 mi
Total Cost
$120
CO2
155 kg
Cost Breakdown
Fly
Door to Door
3h 19m
41m in the air
Air Distance
338 mi
Total Cost
$189
CO2
86 kg
Door-to-Door Timeline
Cost Breakdown
Airports
No scheduled flights found
No commercial flights between SJC and ONT. Flight estimates above are theoretical.
At a Glance
| Drive | Fly | |
|---|---|---|
| Door-to-door time | 7h 14m | 3h 19m |
| Total cost (1 person) | $120 | $189 |
| Carbon footprint | 155 kg CO2 | 86 kg CO2 |
| Flexibility | High | Low |
| Luggage | Unlimited | Restricted |
| Reliability | Weather dependent | Data unavailable |
Costs are estimates. Actual flight prices vary by airline, date, and booking time. Drive costs based on OSRM routing, EIA fuel prices. Computed Apr 12, 2026.
Decided to drive? See the full trip plan from Fremont, CA to Diamond Bar, CA with stops, fuel costs, and turn-by-turn directions.