HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Eureka

$274+ Cheap flights from Ontario (ONT) to Eureka, CA

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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ACV
Aug 18 — Aug 251
Mon 8/18
Mon 8/25
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Eureka 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 Ontario to Eureka

Keep the following information in mind while searching for Ontario to Eureka flight deals. Data was last updated August 13, 2025.

Round-trip from

$314
(United Airlines)

One-way from

$274
(United Airlines)

Popular in

January

Cheapest in

August

Average price

$284
From Ontario to Eureka
Search Deals
One-way flight from Ontario to Eureka
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($44 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($20 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Ontario to Eureka

Cheapest flights from Ontario to Eureka
Explore the most affordable flight options available from Ontario to Eureka. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 13, 2025.

This United Airlines deal was found by Cheapflights users on 8/12. 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 10/221:53 pmONT - ACV
1 stop4h 00mUnited Airlines
Wed 10/296:45 pmACV - ONT
1 stop4h 00mUnited Airlines
Deal found 8/12$314
This United Airlines deal was found by Cheapflights users on 8/11. 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 8/266:00 amONT - ACV
1 stop4h 49mUnited Airlines
Sat 8/302:13 pmACV - ONT
1 stop3h 24mUnited Airlines
Deal found 8/11$324
This United Airlines deal was found by Cheapflights users on 8/12. 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 9/96:50 pmONT - ACV
1 stop3h 24mUnited Airlines
Tue 9/166:40 pmACV - ONT
1 stop17h 33mUnited Airlines
Deal found 8/12$338
This United Airlines deal was found by Cheapflights users on 8/12. 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 9/236:00 amONT - ACV
1 stop4h 49mUnited Airlines
Tue 9/306:45 pmACV - ONT
1 stop4h 07mUnited Airlines
Deal found 8/12$344
This United Airlines deal was found by Cheapflights users on 8/12. 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 8/276:00 amONT - ACV
1 stop4h 49mUnited Airlines
Sun 8/312:13 pmACV - ONT
1 stop6h 20mUnited Airlines
Deal found 8/12$349
This United Airlines deal was found by Cheapflights users on 8/10. 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 9/289:36 amONT - ACV
1 stop5h 02mUnited Airlines
Sat 10/46:45 pmACV - ONT
1 stop4h 07mUnited Airlines
Deal found 8/10$359
This United Airlines deal was found by Cheapflights users on 8/12. 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 8/211:42 pmONT - ACV
1 stop4h 07mUnited Airlines
Sun 8/247:20 amACV - ONT
1 stop4h 53mUnited Airlines
Deal found 8/12$384
This United Airlines deal was found by Cheapflights users on 8/11. 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 8/126:10 amONT - ACV
1 stop4h 43mUnited Airlines
Tue 8/194:10 pmACV - ONT
1 stop4h 23mUnited Airlines
Deal found 8/11$389
This United Airlines deal was found by Cheapflights users on 8/11. 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 9/91:15 pmONT - ACV
2 stops21h 34mUnited Airlines
Sat 9/132:13 pmACV - ONT
1 stop3h 24mUnited Airlines
Deal found 8/11$409
This United Airlines deal was found by Cheapflights users on 8/10. 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 9/46:00 amONT - ACV
1 stop4h 49mUnited Airlines
Sun 9/77:20 amACV - ONT
1 stop4h 53mUnited Airlines
Deal found 8/10$410
This United Airlines deal was found by Cheapflights users on 8/12. 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 11/85:05 amONT - ACV
2 stops29h 50mUnited Airlines
Mon 11/104:05 pmACV - ONT
1 stop6h 40mUnited Airlines
Deal found 8/12$418

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Eureka 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 August 13, 2025.
Use the filters below to find and compare flights from Ontario to Eureka that are best for you.

Fly from

Ontario

Fly to

Eureka

Route

Depart

Return

Price

OntarioArcata

ONT - ACV

ONTACV

Ontario

Wed 10/22

1:53 pm-5:53 pm

1 stop4h 00m

Arcata Eureka

Wed 10/29

2:15 pm-5:34 pm

1 stop3h 19m

$314

OntarioArcata

ONT - ACV

ONTACV

Ontario

Tue 9/9

6:00 am-10:49 am

1 stop4h 49m

Arcata Eureka

Sat 9/13

2:13 pm-5:37 pm

1 stop3h 24m

$314

OntarioArcata

ONT - ACV

ONTACV

Ontario

Tue 8/26

6:00 am-10:49 am

1 stop4h 49m

Arcata Eureka

Sat 8/30

2:13 pm-5:37 pm

1 stop3h 24m

$324

OntarioArcata

ONT - ACV

ONTACV

Ontario

Wed 8/27

6:00 am-10:49 am

1 stop4h 49m

Arcata Eureka

Sun 8/31

2:13 pm-8:33 pm

1 stop6h 20m

$349

OntarioArcata

ONT - ACV

ONTACV

Ontario

Sun 9/28

9:36 am-2:38 pm

1 stop5h 02m

Arcata Eureka

Sat 10/4

6:45 pm-10:52 pm

1 stop4h 07m

$359

OntarioArcata

ONT - ACV

ONTACV

Ontario

Thu 9/4

6:00 am-10:49 am

1 stop4h 49m

Arcata Eureka

Sun 9/7

7:20 am-12:13 pm

1 stop4h 53m

$410

OntarioArcata

ONT - ACV

ONTACV

Ontario

Mon 8/25

6:00 am-10:49 am

1 stop4h 49m

Arcata Eureka

Fri 8/29

6:40 pm-8:33 pm

1 stop25h 53m

$440

OntarioArcata

ONT - ACV

ONTACV

Ontario

Thu 9/4

6:00 am-10:49 am

1 stop4h 49m

$274

OntarioArcata

ONT - ACV

ONTACV

Ontario

Wed 10/29

6:00 am-10:55 am

1 stop4h 55m

$274

OntarioArcata

ONT - ACV

ONTACV

Ontario

Wed 10/22

1:53 pm-5:53 pm

1 stop4h 00m

$274

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/10

Showing 1-10 of 17 results
1
2

Best time to book a flight from Ontario to Eureka

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

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Eureka (average of $343). Flying from Ontario to Eureka in June is currently the most expensive (average of $574). 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 ONT to EU9?

Find hourly flight availability from Ontario to Eureka. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 13, 2025.

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

Reviews of airlines servicing Eureka

Get insights into the airlines that provide service to Eureka. 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 Eureka. Reviews last updated August 13, 2025.
Read reviews from past customers who have flown United Airlines from Ontario to Eureka. 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
8,920 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Overall

7.4

Food

6.6

Boarding

7.7

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
8,920 reviews
United Airlines
7.4
Good
8,920 reviews

Crew

8.1

Entertainment

7.1

Comfort

7.3

Overall

7.4

Food

6.6

Boarding

7.7

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 Ontario to Eureka. 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 from for flights from Ontario to Eureka?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Eureka. You should not have trouble finding flights to Eureka from Ontario; the airport handles an average of 0 outbound flights to Eureka per day. You should also have plenty of airline options to choose from since 1 airline has flights from the Ontario airport to Eureka. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to Eureka (average of $343). Flying from Ontario to Eureka in June is currently the most expensive (average of $574). 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

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 Ontario to Eureka

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Las Vegas flights
San Jose to Los Angeles flights
San Francisco to Las Vegas flights
Los Angeles to San Jose flights
Santa Ana to Las Vegas flights
Burbank to Las Vegas flights
San Francisco to Los Angeles flights
Los Angeles to San Francisco flights
Oakland to Las Vegas flights
San Jose to Las Vegas flights
San Francisco to Ontario flights
Ontario to San Francisco flights
Santa Ana to San Francisco flights
San Francisco to Santa Ana flights
Oakland to Los Angeles flights
Los Angeles to Oakland flights
San Francisco to San Diego flights
Ontario to Las Vegas flights
Burbank to Oakland flights
Oakland to Santa Ana flights
Oakland to Burbank flights
San Francisco to Burbank flights
Los Angeles to Reno flights
Santa Ana to Oakland flights
Los Angeles to Sacramento flights
Sacramento to Los Angeles flights
Burbank to San Francisco flights
San Jose to San Diego flights
Sacramento to Las Vegas flights
San Diego to Las Vegas flights
Santa Ana to San Jose flights
San Diego to San Jose flights
San Diego to San Francisco flights
San Jose to Santa Ana flights
Santa Rosa to Las Vegas flights
Las Vegas to Los Angeles flights
San Francisco to Palm Springs flights
Fresno to Las Vegas flights
San Francisco to Long Beach flights
Santa Ana to Sacramento flights
Las Vegas to Oakland flights
Oakland to San Diego flights
Sacramento to San Diego flights
Stockton to Las Vegas flights
Reno to Los Angeles flights
Oakland to Ontario flights
Los Angeles to Santa Rosa flights
San Jose to Ontario flights
San Jose to Burbank flights
Burbank to Sacramento flights

Top airline flying from Ontario to Eureka

Discover the top airline that operate flights from Ontario to Eureka. 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 August 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$265Average$390FlexibilityNo 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.