How far in advance should I book tickets for a flight with Frontier from San Francisco to Chicago?

Generally, when trying to get a below average price for your ticket, try to book around 14 days before departure. For the cheapest possible price, our data suggests booking 41 days before departure.

Is Frontier the cheapest airline to fly with from San Francisco to Chicago?

Yes, based on our data, Frontier is the cheapest airline to fly the route with an average price of $224 return. The next cheapest options are Spirit Airlines and Alaska Airlines, with return flights costing on average $241 and $319 respectively.

What is the cheapest Frontier flight from San Francisco to Chicago?

In the last 3 days, the lowest price for a flight with Frontier from San Francisco to Chicago was $205 for a return flight and $98 for a one-way flight.

Does Frontier fly direct to Chicago from San Francisco?

No, Frontier does not fly the route directly.

What’s the cheapest day of the week to fly from San Francisco to Chicago with Frontier?

On average, the cheapest day of the week to fly from San Francisco to Chicago with Frontier is Tuesday, when prices are around $47. The most expensive day is generally Saturday, where the average price is around $65.

What’s the cheapest month to fly from San Francisco to Chicago with Frontier?

The cheapest month for Frontier flights to Chicago from San Francisco is generally September, where plane tickets cost $95 on average. If possible, try to avoid the most expensive months of March and February, where tickets cost $156 and $175 respectively.

$52 Cheap Frontier Flights from San Francisco to Chicago

SFO - CHI

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Cheap Frontier Flight Deals from San Francisco to Chicago

Here are some of the best deals found on KAYAK recently from Frontier for round-trip flights from San Francisco to Chicago that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Round-trip

One-way

Last minute

Recent round-trip Frontier flight deals from San Francisco to Chicago

Recommended round-trip Frontier deals departing in the coming months from San Francisco to Chicago.

Discover the best prices and deals for you by selecting your travel dates.

Choose your dates

2:53 pm - 1:25 pmSFO-ORD

20h 32m1 stop

6:32 pm - 1:33 pmORD-SFO

21h 01m1 stop

$127Frontier

Find Deal

Wed, Feb 12 - Sat, Feb 15

10:59 pm - 5:00 amSFO-ORD

28h 01m1 stop

6:50 am - 12:43 amORD-SFO

19h 53m1 stop

$128Frontier

Find Deal

Thu, Feb 13 - Thu, Feb 20

6:00 am - 12:17 amSFO-MDW

16h 17m1 stop

7:05 am - 12:43 amMDW-SFO

19h 38m1 stop

$129Frontier

Find Deal

Thu, Feb 13 - Wed, Mar 5

10:29 pm - 11:44 amSFO-MDW

11h 15m1 stop

7:15 am - 12:44 pmMDW-SFO

7h 29m1 stop

$130Frontier

Find Deal

Sat, Feb 8 - Mon, Feb 10

12:16 am - 9:51 amSFO-ORD

7h 35m1 stop

6:50 am - 1:33 pmORD-SFO

8h 43m1 stop

$130Frontier

Find Deal

Tue, Feb 18 - Wed, Feb 26

12:16 am - 9:51 amSFO-ORD

7h 35m1 stop

6:50 am - 12:43 amORD-SFO

19h 53m1 stop

$131Frontier

Find Deal

Tue, Feb 18 - Mon, Feb 24

7:54 pm - 5:31 amSFO-MDW

7h 37m1 stop

8:44 pm - 6:12 pmMDW-SFO

23h 28m1 stop

$133Frontier

Find Deal

Mon, Mar 3 - Mon, Mar 10

2:53 pm - 12:17 amSFO-MDW

7h 24m1 stop

7:05 am - 1:33 pmMDW-SFO

8h 28m1 stop

$137Frontier

Find Deal

Wed, Feb 19 - Wed, Feb 26

4:11 pm - 1:03 amSFO-ORD

6h 52m1 stop

6:45 am - 1:40 pmORD-SFO

8h 55m1 stop

$137Frontier

Find Deal

Tue, Apr 1 - Tue, Apr 8

6:00 am - 12:17 amSFO-MDW

16h 17m1 stop

7:05 am - 1:33 pmMDW-SFO

8h 28m1 stop

$138Frontier

Find Deal

Tue, Mar 4 - Wed, Mar 5

Low season	January
High season	July
Cheapest flight	$52
Average price round-trip	$326

Best time to beat the crowds with an average 5% drop in price.

Most popular time to fly with an average 4% increase in price.

Flight from San Francisco to Chicago Midway Airport

(price for this month)

When to Book Flights with Frontier from San Francisco to Chicago

Average price per month

Flight prices as travel date approaches

How far in advance should I book tickets for a flight with Frontier from San Francisco to Chicago?
Generally, when trying to get a below average price for your ticket, try to book around 14 days before departure. For the cheapest possible price, our data suggests booking 41 days before departure.
Is Frontier the cheapest airline to fly with from San Francisco to Chicago?
Yes, based on our data, Frontier is the cheapest airline to fly the route with an average price of $224 return. The next cheapest options are Spirit Airlines and Alaska Airlines, with return flights costing on average $241 and $319 respectively.
What is the cheapest Frontier flight from San Francisco to Chicago?
In the last 3 days, the lowest price for a flight with Frontier from San Francisco to Chicago was $205 for a return flight and $98 for a one-way flight.
Does Frontier fly direct to Chicago from San Francisco?
No, Frontier does not fly the route directly.
What’s the cheapest day of the week to fly from San Francisco to Chicago with Frontier?
On average, the cheapest day of the week to fly from San Francisco to Chicago with Frontier is Tuesday, when prices are around $47. The most expensive day is generally Saturday, where the average price is around $65.
What’s the cheapest month to fly from San Francisco to Chicago with Frontier?
The cheapest month for Frontier flights to Chicago from San Francisco is generally September, where plane tickets cost $95 on average. If possible, try to avoid the most expensive months of March and February, where tickets cost $156 and $175 respectively.

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6.0

OkayBased on 3,440 verified guest reviews

6.3Boarding

4.7Entertainment

4.9Food

6.9Crew

5.7Comfort

Pros +

Cons -

Show reviews that mention

2.0 Poor

Verified traveler, Jan 2025

JFK-SJU

The flight left over two hours late. They charged me $180 to bring a carry on. There was an error with the spelling of my name and Frontair agent lied that I would need to pay $200 for her to fix the spelling, and pressured me that if I don't do it quick I would lose the flight. I called back and another agent said it costs $75 to fix. All in all, this company is a complete scam.

10.0 Wonderful

Verified traveler, Jan 2025

LAS-JFK

Very easy with the app to board and staff skills

4.0 Mediocre

Verified traveler, Jan 2025

JFK-SJU

I took my first and last flight with FRONTIER. The seats are not able to be reclined so it’s not a very comfortable experience when you take a flight of 3 hours or longer. You must pay for your luggage either carry on or check in, so taking all this in consideration at the end what you think you’re saving your paying in services that should be included. Not a beverage in sight. . You’re seriously better off getting on a proper airline such as Delta, AA, United, etc.

2.0 Poor

Verified traveler, Jan 2025

MCO-MDW

After waiting several minutes to be acknowledged by 3 employees on their phones, was told we had missed our flight because the doors were closed at that literal moment. Had they given any actual service or help while we were standing there we would have been on with time to spare. More than 10 people were turned away in this fashion claiming there was no way they could let us on the plane, even though it was still sitting connected to the terminal. After the desk agents let us know they didn't care about the situation we were forced to pay more than twice the price of our original tickets as no credits were given for the price of the "missed" flight. And the icing on the cake was after being treated poorly, fleeced for another few hundred dollars for new tickets? We waited on the next plane for 25 minutes passed the "doors closed" time, letting almost an extra dozen passengers on board. You're company has lazy, disinterested employees and your lack of any real help will ensure this was the first and last time we fly Frontier. Awful.

2.0 Poor

Verified traveler, Jan 2025

SJU-JFK

Flight was changed (according to Frontier, by Kayak) without my notification. And all flights were delayed by at least an hour and a half. Uncomfortable plane. Bad service. Will never fly Frontier again.

10.0 Wonderful

Verified traveler, Jan 2025

EWR-SJU

Liked price. Seats could be better.

2.0 Poor

Verified traveler, Jan 2025

LAX-SEA

Very poor will never book from frontier again

10.0 Wonderful

Verified traveler, Jan 2025

PHX-DFW

My experience with the phoenix airport was terrible, the personnel lay the ticket counter charged me for a carry on that fit in the carry on size box, and the two women I spoke with were terribly rude and not willing to help.,,, there was one lady “candy” on the flight crew that was amazing and is the only reason I stayed on the flight at all, because the other stewards helping people to get seated on the plane were terrible

6.0 Okay

Alan, Jan 2025

SFO-DEN

I loked walking out on the tarmac to board and no first class. I didn't like that they have no snacks or onboard wifi to bide your time.

8.0 Very good

Michael, Jan 2025

ATL-LAX

The plane was clean, the crew was friendly and helpful. It’s a low cost airline so there was no food, drinks or in flight entertainment but we didn’t expect any of these things. In the room for improvement department, they should install USB ports in seats to charge mobile devices.