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$270+ Cheap flights from Eureka, CA to Ontario (ONT)

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 12/13. Fares are subject to change and may not be available on all flights or dates of travel.
RDD — ONT
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Eureka to Ontario

Keep the following information in mind while searching for Eureka to Ontario flight deals. Data was last updated September 17, 2025.

Round-trip from

$314
(United Airlines)

Popular in

June

Cheapest in

January

Average price

$399
From Eureka to Ontario
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($42 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
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Find flight deals from Eureka to Ontario

Cheapest flights from Eureka to Ontario
Explore the most affordable flight options available from Eureka to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This United Airlines deal was found by Cheapflights users on 9/17. 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.
Sat 12/134:10 pmACV - ONT
1 stop6h 39mUnited Airlines
Fri 12/1910:42 amONT - ACV
1 stop7h 05mUnited Airlines
Deal found 9/17$270
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Sat 11/16:45 pmACV - ONT
1 stop4h 06mUnited Airlines
Sun 11/96:00 amONT - ACV
1 stop4h 55mUnited Airlines
Deal found 9/16$314
This United Airlines deal was found by Cheapflights users on 9/15. 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 9/306:45 pmACV - ONT
1 stop4h 07mUnited Airlines
Sat 10/41:53 pmONT - ACV
1 stop4h 00mUnited Airlines
Deal found 9/15$324
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 12/108:15 amACV - ONT
1 stop4h 02mUnited Airlines
Wed 12/176:00 amONT - ACV
1 stop4h 55mUnited Airlines
Deal found 9/15$344
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Sun 11/23:50 pmACV - ONT
1 stop25h 44mUnited Airlines
Sun 11/96:00 amONT - ACV
1 stop4h 55mUnited Airlines
Deal found 9/15$348
This United Airlines deal was found by Cheapflights users on 9/17. 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.
Sat 10/112:15 pmACV - ONT
1 stop3h 34mUnited Airlines
Mon 10/131:53 pmONT - ACV
1 stop4h 00mUnited Airlines
Deal found 9/17$410
This United Airlines deal was found by Cheapflights users on 9/17. 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.
Sat 10/42:15 pmACV - ONT
1 stop3h 34mUnited Airlines
Mon 10/66:36 pmONT - ACV
1 stop3h 39mUnited Airlines
Deal found 9/17$445
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Wed 10/12:15 pmACV - ONT
1 stop3h 25mUnited Airlines
Sun 10/59:36 amONT - ACV
1 stop12h 39mUnited Airlines
Deal found 9/16$448
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Thu 11/208:20 amACV - ONT
1 stop4h 17mUnited Airlines
Fri 11/286:00 amONT - ACV
1 stop4h 55mUnited Airlines
Deal found 9/16$455
This United Airlines deal was found by Cheapflights users on 9/17. 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.
Wed 9/178:25 amACV - ONT
1 stop3h 48mUnited Airlines
Tue 9/236:00 amONT - ACV
1 stop4h 49mUnited Airlines
Deal found 9/17$485

Cheapflights Fare Finder

 
Customize your flight search to find flights from Eureka to Ontario 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 September 17, 2025.
Use the filters below to find and compare flights from Eureka to Ontario that are best for you.

Fly from

Eureka

Fly to

Ontario

Route

Depart

Return

Price

ArcataOntario

ACV - ONT

ACVONT

Arcata Eureka

Sat 12/13

4:10 pm-10:49 pm

1 stop6h 39m

Ontario

Fri 12/19

10:42 am-5:47 pm

1 stop7h 05m

$270

ArcataOntario

ACV - ONT

ACVONT

Arcata Eureka

Sat 11/1

6:45 pm-10:51 pm

1 stop4h 06m

Ontario

Sun 11/9

6:00 am-10:55 am

1 stop4h 55m

$314

ArcataOntario

ACV - ONT

ACVONT

Arcata Eureka

Tue 9/30

6:45 pm-10:52 pm

1 stop4h 07m

Ontario

Sat 10/4

1:53 pm-5:53 pm

1 stop4h 00m

$324

ArcataOntario

ACV - ONT

ACVONT

Arcata Eureka

Sat 2/28

7:18 am-12:18 pm

1 stop5h 00m

Ontario

Wed 3/4

6:00 am-10:56 am

1 stop4h 56m

$410

ArcataOntario

ACV - ONT

ACVONT

Arcata Eureka

Sat 10/11

2:15 pm-5:49 pm

1 stop3h 34m

Ontario

Mon 10/13

9:36 am-2:38 pm

1 stop5h 02m

$410

ArcataOntario

ACV - ONT

ACVONT

Arcata Eureka

Sat 10/4

2:15 pm-5:49 pm

1 stop3h 34m

Ontario

Mon 10/6

6:36 pm-10:15 pm

1 stop3h 39m

$445

ArcataOntario

ACV - ONT

ACVONT

Arcata Eureka

Wed 10/1

2:15 pm-5:40 pm

1 stop3h 25m

Ontario

Sun 10/5

9:36 am-10:15 pm

1 stop12h 39m

$448

ArcataOntario

ACV - ONT

ACVONT

Arcata Eureka

Thu 11/20

8:20 am-12:37 pm

1 stop4h 17m

Ontario

Fri 11/28

6:00 am-10:55 am

1 stop4h 55m

$455

ArcataOntario

ACV - ONT

ACVONT

Arcata Eureka

Thu 10/2

6:45 pm-10:52 pm

1 stop4h 07m

$317

ArcataOntario

ACV - ONT

ACVONT

Arcata Eureka

Thu 10/9

4:00 pm-10:52 pm

1 stop6h 52m

$323

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

Showing 1-10 of 14 results
1
2

Best time to book a flight from Eureka to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Eureka 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 Eureka to Ontario

What is the cheapest month to book a flight from Eureka to Ontario?

Currently, August is the cheapest month in which you can book a flight from Eureka to Ontario (average of $246). Flying from Eureka to Ontario in March is currently the most expensive (average of $327). 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.

What is the cheapest time of day to fly from EU9 to ONT?

Find hourly flight availability from Eureka to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Eureka to Ontario as you normally would.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated September 17, 2025.
Get a feel of what it's like to fly with United Airlines from Eureka to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,926 reviews

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.6

Entertainment

7.1

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
8,926 reviews
United Airlines
7.4
Good
8,926 reviews

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.6

Entertainment

7.1

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 Eureka to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Ontario from Eureka?

    Most people fly into Ontario (ONT) if they book a flight to Ontario from Eureka. On average, Ontario has 0 inbound flights from Eureka per day from 1 airline. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

  • How long is the flight from Eureka to Ontario?

    There are many flights that can get you from Eureka to Ontario in 6h 39m. Fly via United Airlines to get the fastest option. There are 595 mi between Eureka and Ontario.

  • Can I find deals for flights from Eureka to Ontario that include hotel bookings?

    Yes. In addition to deals on Eureka to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Eureka to Ontario?

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

  • Can I find deals for business class flights from Eureka to Ontario?

    Yes. Cheapflights offers flight deals from Eureka to Ontario 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 Eureka to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Eureka to Ontario (average of $246). Flying from Eureka to Ontario in March is currently the most expensive (average of $327). 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

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Alternative routes for Eureka to Ontario

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Top airline flying from Eureka to Ontario

Discover the top airline that operate flights from Eureka to Ontario. 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$283Average$570FlexibilityNo cancel feeOn-time69%

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