Chicago to San Francisco MDW, ORD, RFD → SFO
Chicago Midway International Airport (MDW), O'Hare International Airport (ORD), Chicago Rockford International Airport (RFD) → San Francisco International Airport (SFO)
The cheapest return found recently is $349 with Frontier Airlines, 7 Nov – 7 Nov, found today. The cheapest one-way found recently is $128 with Allegiant Air, 2 Dec, found yesterday.
Return
The cheapest return fare on each of 7 departure dates is usually $322 to $386.
Cheapest return found recently
$349
7 Nov – 7 Nov · Frontier Airlines
O'Hare International Airport (ORD) → San Francisco International Airport (SFO)
Leaves 7:05 a.m. · Return leaves 11:47 p.m. · 23 h 20 min of travel, both ways together
out 1 stop, back 1 stop
found today
Cheapest nonstop return
$405
14 Apr 2027 – 17 Apr 2027 · Southwest Airlines
Chicago Midway International Airport (MDW) → San Francisco International Airport (SFO)
Leaves 10:10 a.m. · Return leaves 11:50 p.m. · 9 h of travel, both ways together
out nonstop, back nonstop
found today
Found recently, and the cheapest we hold
$349 7 Nov – 7 Novfound todaySee prices for these dates
$220 25 Nov – 8 Decfound 4 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 $220 to $291.
At $349, 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 7 departure dates from 23 Oct to 17 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 0-night return fares leaving within 3 days of 7 Nov to compare.
Every date we hold
17 fares on 7 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 23 Oct – 25 Oct | $691 | Allegiant Air | Chicago Rockford International Airport (RFD) → San Francisco International Airport (SFO) | out 2 stops, back 1 stop | found 6 days ago | See prices for these dates |
| 6 Nov – 7 Nov | $381 | Frontier Airlines | O'Hare International Airport (ORD) → San Francisco International Airport (SFO) | out 1 stop, back 1 stop | found today | See prices for these dates |
| 7 Nov – 9 Nov | $285 | Frontier Airlines | Chicago Midway International Airport (MDW) → San Francisco International Airport (SFO) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
| 8 Nov – 20 Nov | $391 | Frontier Airlines | O'Hare International Airport (ORD) → San Francisco International Airport (SFO) | out 1 stop, back 1 stop | found 6 days ago | See prices for these dates |
| 25 Nov – 8 Dec | $220 | Frontier Airlines | O'Hare International Airport (ORD) → San Francisco International Airport (SFO) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 14 Apr 2027 – 17 Apr 2027 | $360 | Alaska Airlines | O'Hare International Airport (ORD) → San Francisco International Airport (SFO) | out 1 stop, back 1 stop | found today | See prices for these dates |
| 17 Jul 2027 – 20 Jul 2027 | $359 | Alaska Airlines | O'Hare International Airport (ORD) → San Francisco International Airport (SFO) | out 1 stop, back 1 stop | found yesterday | See prices for these dates |
Which month looks cheapest?
November 2026 is the cheapest month — from $220.
Airlines on the cheapest dates: Frontier Airlines, Alaska Airlines, Allegiant Air.
One-way
The cheapest one-way fare on each of 6 departure dates is usually $147 to $183.
Cheapest one-way found recently
$128
2 Dec · Allegiant Air
Chicago Rockford International Airport (RFD) → San Francisco International Airport (SFO)
Leaves 4:01 p.m. · 23 h 14 min trip
1 stop
found yesterday
Cheapest nonstop one-way
$209
31 Mar 2027 · Southwest Airlines
Chicago Midway International Airport (MDW) → San Francisco International Airport (SFO)
Leaves 9:05 p.m. · 4 h 40 min trip
nonstop
found yesterday
Found recently, and the cheapest we hold
$128 2 Decfound yesterdayOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 25 days, 24 Sept to 18 Oct, the cheapest one-way we saw each day was $57 to $171.
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 6 departure dates from 3 Nov to 9 Jun 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 2 Dec to compare.
Every date we hold
12 fares on 6 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 3 Nov | $379 | Allegiant Air | Chicago Rockford International Airport (RFD) → San Francisco International Airport (SFO) | 3 stops | found 6 days ago | Open this trip |
| 14 Nov | $136 | Frontier Airlines | O'Hare International Airport (ORD) → San Francisco International Airport (SFO) | 1 stop | found 6 days ago | Open this trip |
| 2 Dec | $128 | Allegiant Air | Chicago Rockford International Airport (RFD) → San Francisco International Airport (SFO) | 1 stop | found yesterday | Open this trip |
| 31 Mar 2027 | $181 | Alaska Airlines | O'Hare International Airport (ORD) → San Francisco International Airport (SFO) | 1 stop | found yesterday | Open this trip |
| 3 Apr 2027 | $183 | Alaska Airlines | O'Hare International Airport (ORD) → San Francisco International Airport (SFO) | 1 stop | found 3 days ago | Open this trip |
| 9 Jun 2027 | $182 | Alaska Airlines | O'Hare International Airport (ORD) → San Francisco International Airport (SFO) | 1 stop | found 3 days ago | Open this trip |
Which month looks cheapest?
December 2026 is the cheapest month — from $128.
Airlines on the cheapest dates: Alaska Airlines, Allegiant Air, Frontier Airlines.
Premium cabin fares from Chicago to San Francisco
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 7 Nov – 7 Nov in another cabin: Premium economy · Business · First
Today's prices for 2 Dec in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Chicago to San Francisco?
Return
Fares 30 to 59 days before departure were typically 22% 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 | $339 | $334 | +29% | 12 |
| 7–13 days | $324 | $308 | +23% | 15 |
| 14–29 days | $313 | $233 | +19% | 21 |
| 30–59 days | $263 | $220 | Cheapest seen | 16 |
| 60–89 days | $382 | $382 | +45% | 8 |
| 90–179 days | $291 | $242 | +11% | 17 |
| 180+ days | $349 | $342 | +33% | 25 |
One-way
The cheapest fares were 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 |
|---|---|---|---|---|
| 14–29 days | $134 | $57 | +5% | 14 |
| 30–59 days | $128 | $96 | Cheapest seen | 19 |
| 60–89 days | $143 | $131 | +12% | 21 |
| 90–179 days | $156 | $79 | +22% | 23 |
| 180+ days | $170 | $164 | +33% | 25 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Chicago → Oakland
13 km from San Francisco
$484
$135 more than flying to San Francisco
8 Nov – 20 Nov · MDW → OAK · out nonstop, back 1 stop
found 6 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Chicago → San Jose
67 km from San Francisco
$176
$48 more than flying to San Francisco
9 Jun 2027 · ORD → SJC · 1 stop
found 6 days ago
Chicago → Sacramento
121 km from San Francisco
$256
$128 more than flying to San Francisco
29 Nov · ORD → SMF · 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 7 Nov – 7 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