San Francisco to Chicago SFO → ORD, RFD
San Francisco International Airport (SFO) → O'Hare International Airport (ORD), Chicago Rockford International Airport (RFD)
The cheapest return found recently is $301 with Frontier Airlines, 11 Nov – 14 Nov, found yesterday. The cheapest one-way found recently is $201 with Alaska Airlines, 31 Mar 2027, found yesterday.
Return
The cheapest return fare on each of 3 departure dates is usually $281 to $376.
Cheapest return found recently
$301
11 Nov – 14 Nov · Frontier Airlines
San Francisco International Airport (SFO) → O'Hare International Airport (ORD)
Leaves 11:47 p.m. · Return leaves 6:30 a.m. · 14 h 24 min of travel, both ways together
out 1 stop, back 1 stop
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$301 11 Nov – 14 Novfound yesterdaySee prices for these dates
$260 14 Nov – 17 Novfound 5 days agoSee prices for these dates
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest return we saw each day was $116 to $275.
At $301, the cheapest return found recently is above that range.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 3 departure dates from 11 Nov to 24 Nov, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
Yes. Among 3-night return fares leaving within 3 days of 11 Nov, 14 Nov – 17 Nov costs $275: $26 less than the cheapest found recently.
Frontier Airlines · San Francisco International Airport (SFO) → O'Hare International Airport (ORD) · out 1 stop, back 1 stop · found 4 days ago
Every date we hold
4 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 11 Nov – 14 Nov | $301 | Frontier Airlines | San Francisco International Airport (SFO) → O'Hare International Airport (ORD) | out 1 stop, back 1 stop | found yesterday | See prices for these dates |
| 14 Nov – 17 Nov | $260 | Frontier Airlines | San Francisco International Airport (SFO) → O'Hare International Airport (ORD) | out 1 stop, back 1 stop | found 5 days ago | See prices for these dates |
| 24 Nov – 28 Nov | $450 | Frontier Airlines | San Francisco International Airport (SFO) → O'Hare International Airport (ORD) | out 1 stop, back 1 stop | found 6 days ago | See prices for these dates |
Airlines on the cheapest dates: Frontier Airlines.
One-way
The cheapest one-way fare on each of 7 departure dates is usually $151 to $192.
Cheapest one-way found recently
$201
31 Mar 2027 · Alaska Airlines
San Francisco International Airport (SFO) → O'Hare International Airport (ORD)
Leaves 2:10 p.m. · 7 h 49 min trip
1 stop
found yesterday
Cheapest nonstop one-way
$206
19 Apr 2027 · American Airlines
San Francisco International Airport (SFO) → O'Hare International Airport (ORD)
Leaves 11:28 p.m. · 4 h 17 min trip
nonstop
found 5 days ago
Found recently, and the cheapest we hold
$201 31 Mar 2027found yesterdayOpen this trip
$128 5 Jan 2027found 5 days agoOpen this trip
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $94 to $174.
At $201, the cheapest one-way found recently is above that range.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 7 departure dates from 25 Nov to 20 Jul 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 31 Mar 2027 to compare.
Every date we hold
7 fares on 7 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 25 Nov | $160 | Frontier Airlines | San Francisco International Airport (SFO) → O'Hare International Airport (ORD) | 1 stop | found 2 days ago | Open this trip |
| 5 Jan 2027 | $128 | Frontier Airlines | San Francisco International Airport (SFO) → Chicago Rockford International Airport (RFD) | 2 stops | found 5 days ago | Open this trip |
| 7 Jan 2027 | $141 | Frontier Airlines | San Francisco International Airport (SFO) → O'Hare International Airport (ORD) | 1 stop | found 5 days ago | Open this trip |
| 31 Mar 2027 | $201 | Alaska Airlines | San Francisco International Airport (SFO) → O'Hare International Airport (ORD) | 1 stop | found yesterday | Open this trip |
| 19 Apr 2027 | $206 | American Airlines | San Francisco International Airport (SFO) → O'Hare International Airport (ORD) | nonstop | found 5 days ago | Open this trip |
| 19 Jul 2027 | $183 | Alaska Airlines | San Francisco International Airport (SFO) → O'Hare International Airport (ORD) | 1 stop | found 2 days ago | Open this trip |
| 20 Jul 2027 | $182 | Alaska Airlines | San Francisco International Airport (SFO) → O'Hare International Airport (ORD) | 1 stop | found 2 days ago | Open this trip |
Which month looks cheapest?
January 2027 is the cheapest month — from $128.
Airlines on the cheapest dates: Frontier Airlines, Alaska Airlines, American Airlines.
Premium cabin fares from San Francisco to Chicago
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 11 Nov – 14 Nov in another cabin: Premium economy · Business · First
Today's prices for 31 Mar 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for San Francisco to Chicago?
Return
Fares 30 to 59 days before departure were typically 32% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $340 | $321 | +47% | 11 |
| 7–13 days | $278 | $231 | +20% | 16 |
| 14–29 days | $244 | $116 | +5% | 17 |
| 30–59 days | $232 | $226 | Cheapest seen | 19 |
| 60–89 days | $347 | $318 | +50% | 17 |
| 90–179 days | $289 | $289 | +25% | 8 |
| 180+ days | $340 | $340 | +47% | 11 |
One-way
Fares 60 to 89 days before departure were typically 12% lower than 30 to 59 days before departure.
From the cheapest one-way each day between 24 Sept and 18 Oct (25 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 30–59 days | $124 | $101 | +14% | 10 |
| 60–89 days | $109 | $109 | Cheapest seen | 15 |
| 90–179 days | $140 | $112 | +28% | 20 |
| 180+ days | $175 | $174 | +61% | 25 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Sacramento → Chicago
121 km from San Francisco
$347
$46 more than flying from San Francisco
14 Nov – 20 Nov · SMF → ORD · out 1 stop, back 1 stop
found today
San Jose → Chicago
67 km from San Francisco
$376
$75 more than flying from San Francisco
11 Nov – 14 Nov · SJC → ORD · out 1 stop, back 1 stop
found yesterday
Oakland → Chicago
13 km from San Francisco
$381
$80 more than flying from San Francisco
11 Nov – 14 Nov · OAK → ORD · out 1 stop, back 1 stop
found yesterday
San Francisco → Milwaukee
131 km from Chicago
$652
$351 more than flying to Chicago
6 Nov – 7 Nov · SFO → MKE · out 1 stop, back 1 stop
found 2 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
San Jose → Chicago
67 km from San Francisco
$195
$6 less than flying from San Francisco
31 Mar 2027 · SJC → ORD · 1 stop
found yesterday
Oakland → Chicago
13 km from San Francisco
$210
$9 more than flying from San Francisco
23 Nov · OAK → ORD · 1 stop
found yesterday
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 11 Nov – 14 Nov. A live search on this page shows what those dates cost now, for one adult in economy.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work