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).

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.

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.

Find Cheap Flights from Ontario to Eureka

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Find flight deals from Ontario to Eureka

Most accurate provider	FlightHub 3 stars
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Popular in	February
Cheapest in	September
Average price	$394

Provider with most accurate pricing for Los Angeles-Arcata Eureka flight deals.

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Highest demand for flights based on searches. 13% potential increase in price ($66 potential increase over avg. RT price).

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Cheapest flight prices on average. 6% potential price decrease ($29 potential savings vs. average RT price).

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Average for round-trip flights in October 2026

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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

10,275 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

10,275 reviews

United Airlines

7.4

Good

10,275 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.

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Top airline flying from Ontario to Eureka

Airline	Cheapest	Average	Flexibility	On-time
United Airlines	Cheapest$267	Average$376	FlexibilityNo cancel fee	On-time69%

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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

Find flight deals from Ontario to Eureka

Most accurate provider

Most trusted provider

Popular in

Cheapest in

Average price

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

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?

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.

Complete your trip

Complete your trip to Eureka by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Ontario to Eureka by cabin class

Find flights from Ontario to Eureka, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Ontario and Eureka flights

Browse other Ontario and Eureka flight options. Last updated on October 2, 2026.

Other flights from Ontario

Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on October 2, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Ontario to Eureka flights

Consider these flights traveling from Ontario to Eureka.

Top airline flying from Ontario to Eureka

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Travel Smart

Cheap flights from Ontario (ONT) to Eureka, CA

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

Find flight deals from Ontario to Eureka

Most accurate provider

Most trusted provider

Popular in

Cheapest in

Average price

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

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?

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.

Complete your trip

Complete your trip to Eureka by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Ontario to Eureka by cabin class

Find flights from Ontario to Eureka, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Ontario and Eureka flights

Browse other Ontario and Eureka flight options. Last updated on October 2, 2026.

Other flights from Ontario

Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on October 2, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Ontario to Eureka flights

Consider these flights traveling from Ontario to Eureka.

Top airline flying from Ontario to Eureka

100% Free

Book with Flexibility

Travel Smart