What is the cheapest day to fly from Ontario to Eureka?

Travelers seeking maximum savings on their Ontario to Eureka flight should consider departing on Saturday mornings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Eureka ranges from 0.3 - 8.4 inches per month. December is typically the wettest month, when rainfall can reach 8.4 in. July is typically the driest time to visit Eureka when rainfall is around 0.3 in.

If weather is an important factor for your trip to Eureka, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 57.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 46.4 F).

How far in advance should I book a flight from Ontario to Eureka?

Travelers have found it’s best to book a flight 22 days in advance to save up to 62% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 22 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Ontario to Eureka 1-2 weeks in advance for as low as $272, or $459 for flights within the next 24 hours.

What is the cheapest month to fly from Ontario to Eureka?

Our data shows that January tends to be the cheapest month to fly to Eureka from Ontario. Users have commonly found prices around $328 for the month, but tickets can be as low as $199. Due to multiple factors, prepare for potentially higher prices in August.

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.

$249+ Flights from Ontario to Eureka

Q: How much does it cost to fly round-trip from Ontario to Eureka?

Airfare is below average for this route at the moment. Ontario to Eureka flights typically cost between $284 and $1,071 in August. The cheapest round-trip price found within the last 3 days was $249 on United Airlines (Aug 13-Aug 20).

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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

Round-trip from	$249 (United Airlines)
Popular in	August
Cheapest in	May
Average price	$369

From Ontario to Eureka

Search Deals

Highest demand for flights based on searches. 21% potential increase in price ($128 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 12% potential price decrease ($51 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in July 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 julio 29, 2025.

mié. 8/136:10 amONT - ACV

1 stop4h 43mUnited Airlines

mié. 8/208:25 amACV - ONT

1 stop3h 48mUnited Airlines

Deal found 7/28

$249

Best flights from Ontario to Eureka
Discover carefully curated flight deals from Ontario to Eureka that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated julio 29, 2025.

mié. 8/136:10 amONT - ACV

1 stop4h 43mUnited Airlines

mié. 8/208:25 amACV - ONT

1 stop3h 48mUnited Airlines

Deal found 7/28

$249

Last-minute flights from Ontario to Eureka
Discover last-minute flight deals from Ontario to Eureka. Data last updated julio 29, 2025 and is based on user searches.

jue. 8/76:10 amONT - ACV

1 stop4h 43mUnited Airlines

mar. 8/194:10 pmACV - ONT

1 stop4h 23mUnited Airlines

Deal found 7/27

$344

mié. 8/136:10 amONT - ACV

1 stop4h 43mUnited Airlines

mié. 8/208:25 amACV - ONT

1 stop3h 48mUnited Airlines

Deal found 7/28

$249

One-way flights from Ontario to Eureka
Search for one-way flight options from Ontario to Eureka. Find affordable one-way fares based on user searches. Data last updated julio 29, 2025.

jue. 8/211:42 pmONT - ACV

1 stop4h 07mUnited Airlines

Deal found 7/29

$274

Fly from

Fly to

Route

Depart

Return

Price

OntarioArcata

ONT - ACV

ONTACV

Ontario

mié. 8/13

6:10 am-10:53 am

1 stop4h 43m

Arcata Eureka

mié. 8/20

8:25 am-12:13 pm

1 stop3h 48m

$249

OntarioArcata

ONT - ACV

ONTACV

Ontario

jue. 8/21

1:42 pm-5:49 pm

1 stop4h 07m

$274

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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 $572). 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?

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.

How much does it cost to fly round-trip from Ontario to Eureka?

Reviews of airlines servicing Eureka

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

8,899 reviews

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

8,899 reviews

United Airlines

7.4

Good

8,899 reviews

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

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 $572). 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

Alternative routes for Ontario to Eureka

Ontario to San Francisco flights

Los Angeles to Las Vegas flights

Los Angeles to San Francisco flights

Burbank to Las Vegas flights

Santa Ana to Las Vegas flights

San Francisco to Los Angeles flights

San Francisco to Las Vegas flights

Santa Ana to San Francisco flights

San Jose to Los Angeles flights

Los Angeles to San Jose flights

San Francisco to Ontario flights

San Jose to Las Vegas flights

Oakland to Las Vegas flights

Los Angeles to Oakland flights

San Francisco to Santa Ana flights

Oakland to Los Angeles flights

Oakland to Santa Ana flights

San Francisco to San Diego flights

Ontario to Las Vegas flights

Los Angeles to Reno flights

San Diego to Las Vegas flights

San Jose to San Diego flights

Oakland to Burbank flights

Santa Ana to Oakland flights

Santa Rosa to San Diego flights

Los Angeles to Sacramento flights

San Francisco to Burbank flights

Burbank to Oakland flights

Burbank to San Francisco flights

San Diego to San Francisco flights

Sacramento to Las Vegas flights

Oakland to San Diego flights

Sacramento to Los Angeles flights

Sacramento to San Diego flights

Santa Ana to San Jose flights

San Diego to San Jose flights

Sacramento to Ontario flights

Ontario to San Jose flights

Las Vegas to Los Angeles flights

San Jose to Ontario flights

Sacramento to Santa Ana flights

Santa Rosa to Las Vegas flights

Fresno to Las Vegas flights

San Jose to Santa Ana flights

Burbank to San Jose flights

San Jose to Burbank flights

San Diego to Sacramento flights

Sacramento to Burbank flights

Los Angeles to Santa Rosa flights

Ontario to Sacramento flights

Complete your trip

Eureka car rentals

Redding Airport car rentals

Crescent City McNamara Field Airport car rentals

Los Angeles car rentals

San Francisco car rentals

San Diego car rentals

Fresno car rentals

San Jose car rentals

Sacramento car rentals

Ontario car rentals

Burbank car rentals

Bakersfield car rentals

Top airline flying from Ontario to Eureka

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$265	Average$392	FlexibilityNo cancel fee	On-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.

$249+ Cheap flights from Ontario (ONT) to Eureka, CA

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 8/13. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Ontario to Eureka with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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 julio 29, 2025.

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from Ontario to Eureka

Cheapest flights from Ontario to EurekaExplore 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 julio 29, 2025.

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 julio 29, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Ontario to Eureka that are best for you.

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.

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?

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 julio 29, 2025.

How much does it cost to fly round-trip from Ontario to Eureka?

Reviews of airlines servicing Eureka

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.

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?

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

How can I find direct flights from Ontario to Eureka?

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

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

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.

Top airline flying from Ontario to Eureka

100% Free

Book with Flexibility

Travel Smart

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 julio 29, 2025.