Drive or Fly: Diamond Bar, CA to San Diego, CA?

Side-by-side comparison of driving versus flying for this route. Costs, time, and trade-offs at a glance.

Driving wins

Medium

No scheduled commercial flights found for ONT–SAN. At 110 miles, driving is the only practical option.

Passengers:

Vehicle:

Drive

Door to Door

2h 13m

Distance

110.5 mi

Total Cost

$60

CO2

45 kg

Cost Breakdown

Diesel$25

Hotel (1 room, 0 nights) $0

Meals (1 pax, 1 day) $35

+ No luggage restrictions or TSA lines

+ Comfortable one-day drive

+ Stop anywhere along the route

+ Have your own car at the destination

+ Likely faster door-to-door than flying

− Wear and tear on vehicle

− Fuel price fluctuations

Plan the drive

Fly

Door to Door

2h 40m

12m in the air

Air Distance

98 mi

Total Cost

$124

CO2

25 kg

Door-to-Door Timeline

Diamond Bar, CA → ONT 18m

Check-in & Security 90m

Flight 12m

Arrival & Baggage 30m

SAN → San Diego, CA 10m

Cost Breakdown

Ticket (1 pax @ $124) $124

Airports

Diamond Bar, CA ONT — Ontario International Airport 12 mi, ~18m drive

San Diego, CA SAN — San Diego International Airport 2 mi, ~10m drive

No scheduled flights found

No commercial flights between ONT and SAN. Flight estimates above are theoretical.

+ Less physical fatigue

+ Predictable arrival time

− Airport security and check-in overhead

− No scheduled commercial flights found for this route

− Luggage fees and restrictions

− Less flexibility for stops along the way

At a Glance

	Drive	Fly
Door-to-door time	2h 13m	2h 40m
Total cost (1 person)	$60	$124
Carbon footprint	45 kg CO₂	25 kg CO₂
Flexibility	High	Low
Luggage	Unlimited	Restricted
Reliability	Weather dependent	Data unavailable

Drive data: OSRM routing, EIA fuel prices

Flight data: Statistical estimate

Airports: OurAirports

Confidence: Medium — airports identified, fares estimated

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 Diamond Bar, CA to San Diego, CA with stops, fuel costs, and turn-by-turn directions.