How long is the flight from San Francisco to Decatur, Illinois?

There are many flights that can get you from San Francisco to Decatur, Illinois in 21h 10m. Fly via United Airlines to get the fastest option. The distance between San Francisco and Decatur, Illinois is about 1801 mi.

What is the cheapest airline to fly from San Francisco to Decatur, Illinois round-trip?

Cheapflights users have booked flights from San Francisco to Decatur, Illinois round-trip from $373.

What is the cheapest day to fly from San Francisco to Decatur, Illinois?

Travelers seeking maximum savings on their San Francisco to Decatur, Illinois flight should consider departing on Saturday evenings when fares are most often at their lowest. Thursday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Decatur, Illinois ranges from 1.7 - 4.4 inches per month. June is typically the wettest month, when rainfall can reach 4.4 in. January is typically the driest time to visit Decatur, Illinois when rainfall is around 1.7 in.

If weather is an important factor for your trip to Decatur, Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 75.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 26.6 F).

What is the cheapest day to fly round-trip from San Francisco to Decatur, Illinois?

Departing on a Friday is a good option for securing a great price. You can expect to save up to 45% when planning your travel around this day of the week.

What is the cheapest time of day to fly from SFO to DEC?

One of the essential ways to save on airfare from San Francisco to Decatur, Illinois is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 28% on airfare.

Can I find deals for flights from San Francisco to Decatur that include hotel bookings?

Yes. In addition to deals on San Francisco to Decatur flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from San Francisco to Decatur?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Decatur.

Can I find deals for business class flights from San Francisco to Decatur?

Yes. Cheapflights offers flight deals from San Francisco to Decatur by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$481+ Cheap Flights from San Francisco to Decatur, IL

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Cheap flight deals from San Francisco to Decatur

Round-trip from	$481 (United Airlines)

From San Francisco to Decatur Arpt

Search Deals

Find flight deals from San Francisco to Decatur

Cheapest flights from San Francisco to Decatur
Explore the most affordable flight options available from San Francisco to Decatur. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

Fri 11/76:42 pmSFO - DEC

1 stop21h 10mUnited Airlines

Sun 11/97:08 pmDEC - SFO

2 stops23h 36mUnited Airlines

Deal found 9/10

$481

Thu 9/257:00 amSFO - DEC

1 stop9h 04mUnited Airlines

Sun 9/289:38 amDEC - SFO

1 stop7h 52mUnited Airlines

Deal found 9/9

$490

Best flights from San Francisco to Decatur
Discover carefully curated flight deals from San Francisco to Decatur that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2025.

Fri 11/76:42 pmSFO - DEC

1 stop21h 10mUnited Airlines

Sun 11/97:08 pmDEC - SFO

2 stops23h 36mUnited Airlines

Deal found 9/10

$481

Thu 9/2511:00 pmSFO - DEC

1 stop7h 51mUnited Airlines

Sun 9/286:55 pmDEC - SFO

2 stops14h 50mUnited Airlines

Deal found 9/9

$542

Tue 3/102:02 pmSFO - DEC

1 stop18h 49mUnited Airlines

Wed 3/113:20 pmDEC - SFO

1 stop26h 05mUnited Airlines

Deal found 9/8

$656

Last-minute flights from San Francisco to Decatur
Discover last-minute flight deals from San Francisco to Decatur. Data last updated September 11, 2025 and is based on user searches.

Thu 9/257:00 amSFO - DEC

1 stop9h 04mUnited Airlines

Sun 9/289:38 amDEC - SFO

1 stop7h 52mUnited Airlines

Deal found 9/9

$490

Cheapflights Fare Finder

Use the filters below to find and compare flights from San Francisco to Decatur that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

San FranciscoDecatur

SFO - DEC

SFODEC

San Francisco

Fri 11/7

6:42 pm-5:52 pm

1 stop21h 10m

Decatur Arpt

Sun 11/9

7:08 pm-4:44 pm

2 stops23h 36m

$481

San FranciscoDecatur

SFO - DEC

SFODEC

San Francisco

Thu 9/25

11:00 pm-8:51 am

1 stop7h 51m

Decatur Arpt

Sun 9/28

6:55 pm-7:45 am

2 stops14h 50m

$542

San FranciscoDecatur

SFO - DEC

SFODEC

San Francisco

Tue 3/10

2:02 pm-10:51 am

1 stop18h 49m

Decatur Arpt

Wed 3/11

3:20 pm-3:25 pm

1 stop26h 05m

$656

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Best time to book a flight from San Francisco to Decatur

Have a flexible travel schedule? Discover the best time to fly to Decatur from San Francisco with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Reviews of airlines servicing Decatur

See what other customers who have flown with United Airlines from San Francisco to Decatur have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

8,937 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

United Airlines

7.4

Good

8,937 reviews

United Airlines

7.4

Good

8,937 reviews

Reviews

1 / 20

4.0

Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

How long is the flight from San Francisco to Decatur, Illinois?
There are many flights that can get you from San Francisco to Decatur, Illinois in 21h 10m. Fly via United Airlines to get the fastest option. The distance between San Francisco and Decatur, Illinois is about 1801 mi.
What is the cheapest airline to fly from San Francisco to Decatur, Illinois round-trip?
Cheapflights users have booked flights from San Francisco to Decatur, Illinois round-trip from $373.
Can I find deals for flights from San Francisco to Decatur that include hotel bookings?
Yes. In addition to deals on San Francisco to Decatur flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from San Francisco to Decatur?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Decatur.
Can I find deals for business class flights from San Francisco to Decatur?
Yes. Cheapflights offers flight deals from San Francisco to Decatur by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Mattoon

Effingham

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Top airline flying from San Francisco to Decatur

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$373	Average$469	FlexibilityNo cancel fee	On-time69%

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$481+ Cheap flights from San Francisco to Decatur, IL (SFO - DEC)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/7. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from San Francisco to Decatur with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from San Francisco to Decatur

Round-trip from

Find flight deals from San Francisco to Decatur

Cheapest flights from San Francisco to DecaturExplore the most affordable flight options available from San Francisco to Decatur. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

Explore the most affordable flight options available from San Francisco to Decatur. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from San Francisco to Decatur that are best for you.

Best time to book a flight from San Francisco to Decatur

Have a flexible travel schedule? Discover the best time to fly to Decatur from San Francisco with our price prediction graph.

Reviews of airlines servicing Decatur

See what other customers who have flown with United Airlines from San Francisco to Decatur have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Decatur. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

How long is the flight from San Francisco to Decatur, Illinois?

What is the cheapest airline to fly from San Francisco to Decatur, Illinois round-trip?

Can I find deals for flights from San Francisco to Decatur that include hotel bookings?

How can I find direct flights from San Francisco to Decatur?

Can I find deals for business class flights from San Francisco to Decatur?

Traveling to a place near Decatur?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for San Francisco to Decatur

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from San Francisco to Decatur

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Cheapest flights from San Francisco to Decatur
Explore the most affordable flight options available from San Francisco to Decatur. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.