HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
San Diego

$301+ Cheap flights from Decatur, IL to San Diego (DEC - SAN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/31. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SAN
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Decatur to San Diego with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Decatur to San Diego

Cheapest flights from Decatur to San Diego
Explore the most affordable flight options available from Decatur to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This United Airlines deal was found by Cheapflights users on 12/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/199:44 amDEC - SAN
1 stop7h 49mUnited Airlines
Fri 1/97:00 amSAN - DEC
1 stop9h 01mUnited Airlines
Deal found 12/15$499

Find flight deals from Decatur to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Decatur (DEC) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$394
(United Airlines)

One-way from

$301
(United Airlines)
Provider with most accurate pricing for Decatur Arpt-San Diego flight deals.
Search Deals
Provider most trusted by Cheapflights users for Decatur Arpt-San Diego flights.
Search Deals
From Decatur Arpt to San Diego
Search Deals
One-way flight from Decatur Arpt to San Diego
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Decatur to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 15, 2025.
Use the filters below to find and compare flights from Decatur to San Diego that are best for you.

Fly from

Decatur

Fly to

San Diego

Route

Depart

Return

Price

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Sat 1/17

7:09 pm-11:48 am

1 stop18h 39m

San Diego

Wed 1/21

2:11 pm-6:01 pm

1 stop25h 50m

$394

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Wed 12/31

9:44 am-9:44 am

1 stop26h 00m

$301

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Tue 12/30

9:44 am-8:47 pm

2 stops13h 03m

$430

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/12

Compare providers for flights from Decatur to San Diego

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Decatur to San Diego in December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Decatur, Illinois-San Diego flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Decatur, Illinois-San Diego flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Decatur, Illinois-San Diego flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Decatur, Illinois-San Diego flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Decatur, Illinois-San Diego flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Decatur to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Decatur 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.

Cheapflights Insights

Everything you need to know about your flight from Decatur to San Diego

What is the cheapest month to book a flight from Decatur, Illinois to San Diego?

Currently, May is the cheapest month in which you can book a flight from Decatur, Illinois to San Diego (average of $132). Flying from Decatur, Illinois to San Diego in March is currently the most expensive (average of $357). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing San Diego

Get insights into the airlines that provide service to San Diego. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Diego. Reviews last updated December 15, 2025.
Read reviews from past customers who have flown United Airlines from Decatur to San Diego. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,092 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Simon,Jun 2024

LAS - LAX

Basic and no-frills. Late timing put pressure on disembarking and making connections.
United Airlines
7.4
Good
9,092 reviews
United Airlines
7.4
Good
9,092 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
4.0
Okay

Simon,Jun 2024

LAS - LAX

Basic and no-frills. Late timing put pressure on disembarking and making connections.

Related info for your journey

Find useful and relevant information for your journey from Decatur to San Diego. 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 Decatur, Illinois to San Diego?

    Departing from Decatur, Illinois to San Diego will take you 18h 39m. The distance between Decatur, Illinois and San Diego is about 1643 mi.

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

    United Airlines, at $284, was found to be the cheapest airline from Decatur, Illinois to San Diego..

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

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

  • How can I find direct flights from Decatur to San Diego?

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

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

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

  • What is the cheapest month to book a flight from Decatur, Illinois to San Diego?

    Currently, May is the cheapest month in which you can book a flight from Decatur, Illinois to San Diego (average of $132). Flying from Decatur, Illinois to San Diego in March is currently the most expensive (average of $357). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
El Cajon
Chula Vista
Coronado
La Mesa
Poway
Lemon Grove
Julian
National City

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Decatur to San Diego

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Las Vegas flights
O'Hare Intl to Los Angeles flights
O'Hare Intl to San Francisco flights
Midway to Las Vegas flights
Midway to Los Angeles flights
O'Hare Intl to Ontario flights
O'Hare Intl to Santa Ana flights
O'Hare Intl to San Diego flights
St. Louis to Las Vegas flights
O'Hare Intl to Palm Springs flights
O'Hare Intl to Burbank flights
Midway to San Francisco flights
St. Louis to Los Angeles flights
O'Hare Intl to Reno flights
Midway to Santa Ana flights
O'Hare Intl to Sacramento flights
Midway to San Diego flights
Midway to Ontario flights
O'Hare Intl to San Jose flights
Rockford to Las Vegas flights
St. Louis to San Diego flights
Midway to Palm Springs flights
St. Louis to Ontario flights
O'Hare Intl to Long Beach flights
St. Louis to San Francisco flights
Midway to San Jose flights
Midway to Burbank flights
O'Hare Intl to Oakland flights
Midway to Reno flights
St. Louis to Santa Ana flights
Midway to Sacramento flights
Midway to Oakland flights
Bloomington to Las Vegas flights
St. Louis to Burbank flights
Peoria to Las Vegas flights
Moline to Los Angeles flights
O'Hare Intl to Santa Barbara flights
O'Hare Intl to Fresno flights
Moline to Las Vegas flights
St. Louis to Long Beach flights
Evansville to Los Angeles flights
Midway to Long Beach flights
St. Louis to Palm Springs flights
Peoria to San Francisco flights
O'Hare Intl to Monterey flights
Peoria to Los Angeles flights
Peoria to Santa Ana flights
Moline to San Jose flights
St. Louis to Sacramento flights
Evansville to Ontario flights

Top airline flying from Decatur to San Diego

Discover the top airline that operate flights from Decatur to San Diego. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$284Average$503FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.