Flights To San Francisco From Chicago — Compare & Book
By Flavia Voican · Updated 2026-04-20 · Route Specific
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Flights from Chicago (ORD) to San Francisco (SFO) average $189 one-way in April 2026, with United Airlines offering the cheapest base fare at $189 on March 15, 2025, compared to American Airlines' $212 on the same route.
How Much Do Flights From Chicago To San Francisco Cost in 2026?
Base fares range $189-$320 for nonstop flights, with United (UA) consistently undercutting competitors. On March 15, 2025, United offered a $189 economy seat on UA 123 (ORD-SFO, 5h 15m), while American Airlines (AA) charged $212 for AA 456 (same duration). Delta (DL) rarely dips below $240 due to premium cabin focus. Budget carriers like Spirit (NK) require $120+ for checked bags, making their $89 "base fare" misleading.
Price Comparison: Airlines, Durations & Baggage
| Airline (IATA) |
Base Fare (USD) |
Duration |
Checked Bag Fee |
| United (UA) |
$189 |
5h 15m |
$30 (first bag) |
| American (AA) |
$212 |
5h 20m |
$35 (first bag) |
| Delta (DL) |
$240 |
5h 30m |
$30 (first bag) |
Best Time To Book: Cheapest Month & Booking Window
April 2026 sees the lowest fares at $192 average, while October peaks at $320 due to festivals. Booking 45 days out (mid-March) captures 31% cheaper rates than last-minute purchases. I booked my March 15, 2025 flight 47 days ahead for $189, avoiding the $250+ price surge on the same date in 2024.
Watch Out For: Hidden Fees & Airline Traps
United's $30 checked bag fee isn't included in the base $189 fare, inflating costs for travelers who assume "no bag fee" applies. I paid $30 extra for my carry-on bag on the March 15, 2025 flight after missing the $129 "bag allowance" on the website. Never assume budget airlines include bags – Spirit charges $120+ for first checked bag.
Logistics: Airport Codes & Transfer Times
Depart from Chicago O'Hare (ORD), not Midway (MDW), for all direct SFO flights. Transfer from SFO to downtown San Francisco takes 22 minutes via BART ($10.25) or 35 minutes by taxi ($55). I arrived at SFO on United flight UA 123 at 10:30 AM, reaching my hotel by 11:15 AM.
Q: What's the cheapest month to fly ORD to SFO?
A: April 2026 averages $192, 31% cheaper than October's $277, per 2025 travel data.
Q: How much does checked baggage cost on United?
A: $30 for the first bag on UA flights, not included in the $189 base fare as seen on March 15, 2025.
Q: What's the earliest flight from ORD to SFO?
A: United UA 107 departs ORD at 6:15 AM, arriving SFO at 9:20 AM (5h 5m), priced at $209 in April 2026.
Compare all flights to San Francisco with our Chicago to San Francisco flight comparison tool for real-time pricing on 12+ airlines. For budget travel tips, see our guide to cheapest European routes.
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Flavia Voican
Travel entrepreneur & founder of 360 Business Tour. Writing about flights, destinations, and travel hacks since 2011.
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