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$474+ Cheap flights from Decatur, IL to San Diego (DEC - SAN)

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 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
DEC — SAN
Apr 17 — Apr 241
Fri 4/17
Fri 4/24
1 adult, Economy
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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 March 18, 2026.

This United Airlines deal was found by Cheapflights users on 3/15. 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.
Tue 4/287:37 pm
DEC
-
SAN
1 stop16h 03m
United Airlines
Sat 5/27:00 am
SAN
-
DEC
1 stop23h 58m
United Airlines
Deal found 3/15$474
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Mon 3/309:52 am
DEC
-
SAN
2 stops12h 20m
United Airlines
Fri 4/34:49 pm
SAN
-
DEC
1 stop18h 05m
United Airlines
Deal found 3/15$710

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 March 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$474
(United Airlines)
Provider with most accurate pricing for Decatur Arpt-San Diego flight deals.
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Provider most trusted by Cheapflights users for Decatur Arpt-San Diego flights.
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From Decatur Arpt to San Diego
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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 March 18, 2026.
Use the filters below to find and compare flights from Decatur to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

DecaturSan Diego

DEC - SAN

DECSAN

Decatur Arpt

Tue 4/28

7:37 pm-9:40 am

1 stop16h 03m

San Diego

Sat 5/2

10:40 pm-5:58 pm

1 stop17h 18m

$474

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/13

Sorted by cheapest first
  • Most accurate provider: When it comes to deals on Decatur, Illinois-San Diego flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Decatur, Illinois-San Diego flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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, April is the cheapest month in which you can book a flight from Decatur, Illinois to San Diego (average of $228). Flying from Decatur, Illinois to San Diego in May is currently the most expensive (average of $331). 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 March 18, 2026.
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
9,435 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

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
9,435 reviews
United Airlines
7.4
Good
9,435 reviews

Entertainment

7.1

Food

6.6

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

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 16h 03m. The distance between Decatur, Illinois and San Diego is about 1643 mi.

  • 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, April is the cheapest month in which you can book a flight from Decatur, Illinois to San Diego (average of $228). Flying from Decatur, Illinois to San Diego in May is currently the most expensive (average of $331). 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
National City
Coronado
La Mesa
Poway
Julian
Lemon Grove

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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 March 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$284Average$450FlexibilityNo cancel feeOn-time69%

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