Compare: Chicago→San Francisco (2,985 km) vs Chicago→Los Angeles (2,804 km). Chicago → Los Angeles wins by 181 km (6%). Side-by-side with flight & drive times.
By SnapDistance Team · Updated April 7, 2026
2,985 km
1,855 miles · Flight: ~4h 14min · Drive: ~48h 30min
2,804 km
1,742 miles · Flight: ~4h · Drive: ~45h 34min
✓ Shorter route
Difference: 181 km (6%) · Flight time difference: ~14 min
Verdict
Chicago → Los Angeles is the smarter pick if travel time and emissions matter most: it is 181 km (6%) shorter, saves about 14 min of flight time, and cuts roughly 46 kg of CO₂ per passenger. Choose Chicago → San Francisco only if the destination itself is the reason for the trip.
Chicago → Los Angeles is the shorter route at 2,804 km, which is 181 km (6%) shorter than Chicago → San Francisco. You would save approximately 14 min in flight time by choosing the shorter route.
| Metric | Chicago → San Francisco | Chicago → Los Angeles |
|---|---|---|
| Distance (km) | 2,985 | 2,804 |
| Distance (miles) | 1,855 | 1,742 |
| Flight time | ~4h 14min | ~4h |
| Driving time | ~48h 30min | ~45h 34min |
| Road distance (est.) | ~3,881 km | ~3,645 km |
| Drivable? | Yes | Yes |
| Cross-continental | No | No |
| Initial bearing | 273° (W) | 262° (W) |
| Time-zone shift | -2h | -2h |
| CO₂ – flight (per pax) | ~761 kg | ~715 kg |
| CO₂ – driving (per car) | ~664 kg | ~623 kg |
| Fuel cost (est.) | ~$388 USD | ~$365 USD |
Flying from Chicago to San Francisco produces roughly 761 kg of CO₂ per passenger, based on the ICAO/EEA short-haul emission factor of ~0.255 kg per passenger-km. The Chicago → Los Angeles flight emits about 715 kg. Choosing the shorter route saves approximately 46 kg of CO₂ per traveler — equivalent to 2 typical tree-years of carbon sequestration. For comparison, driving emits roughly 664 kg and 623 kg per car respectively — meaningful only when the car carries multiple passengers.
The Chicago to San Francisco route covers 2,985 km (1,855 miles), staying within North America. Chicago (population: 2,693,976) is located in Midwest, United States, while San Francisco (population: 873,965) is in West Coast, United States.
The Chicago to Los Angeles route covers 2,804 km (1,742 miles), remaining within North America. Chicago (population: 2,693,976) is in Midwest, United States, and Los Angeles (population: 3,979,576) is in West Coast, United States.
Flying from Chicago to San Francisco takes approximately 4h 14min, while Chicago to Los Angeles takes 4h. If driving is an option, expect roughly 48h 30min for the first route and 45h 34min for the second.
Since both routes depart from Chicago, this comparison is especially useful for travelers deciding between San Francisco and Los Angeles as a destination.
The 181 km difference between these routes is relatively modest, so other factors like ticket prices and schedules may matter more.
Both routes are drivable, with road distances of approximately 3,881 km and 3,645 km respectively. For road trips, the shorter route saves roughly 236 km of driving.
San Francisco (United States) has a population of 873,965 and is located in the West Coast region of North America. It's a charming destination known for its regional character.
Los Angeles (United States) has a population of 3,979,576 and is situated in West Coast, North America. This city serves as an important regional hub with solid connectivity.
Choose this route if your priority is reaching San Francisco (United States) — a city of 873,965 in the West Coast region of North America. Despite being the longer of the two at 2,985 km, it makes sense when San Francisco itself is the destination, the schedule fits better, or ticket prices are noticeably lower. Driving is realistic at this distance, with an estimated 3,881 km of road and a fuel cost band around $388 USD. The initial bearing is 273° (W), so a great-circle flight leaves Chicago heading roughly W.
This route is the right call if you are heading to Los Angeles (United States) — a city of 3,979,576 in the West Coast region of North America. It is also the shorter of the two at 2,804 km, saving about 14 min of flying and around 46 kg of CO₂ per passenger. Driving is feasible — expect roughly 3,645 km of road and a fuel cost in the $365 USD range. Departing Chicago, the great-circle bearing toward Los Angeles is 262° (W).
Chicago (41.88°, -87.63°) and San Francisco (37.77°, -122.42°) sit with a time-zone shift of -2 hours. Chicago (41.88°, -87.63°) and Los Angeles (34.05°, -118.24°) have a -2-hour offset. Both routes have manageable time-zone shifts, so jet lag should not be a major factor.
Los Angeles is closer at 2,804 km, which is 181 km (6%) shorter.
2,985 km (1,855 miles). Flight: ~4h 14min.
2,804 km (1,742 miles). Flight: ~4h.
Flying to Los Angeles is faster at ~4h, saving about 14 min compared to San Francisco.
All distances on SnapDistance are calculated using the Haversine formula, which determines the great-circle distance between two points on Earth's surface. This gives the shortest possible distance over the globe, which is the measurement used for aviation and navigation. Actual travel distances by road or rail are typically 20-40% longer due to terrain, borders, and infrastructure routing. Flight times assume 800 km/h cruising speed with 30 minutes for takeoff and landing. Driving estimates use 80 km/h average speed with a 30% road distance factor.
📍 Data: Coordinates from OpenStreetMap contributors. Distances calculated using the Haversine formula. Travel times are estimates only. Last verified: April 7, 2026.