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Bilbao

$540+ Cheap flights from Ontario (ONT) to Bilbao (BIO)

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BIO
ago. 3 — ago. 101
dom. 8/3
dom. 8/10
1 adult, Economy
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Cheap flight deals from Ontario to Bilbao

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Bilbao (BIO). 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 julio 29, 2025.

Round-trip from

$621
(United Airlines)

One-way from

$540
(United Airlines)

Popular in

December

Cheapest in

March

Average price

$1,105
From Ontario to Bilbao
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One-way flight from Ontario to Bilbao
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Highest demand for flights based on searches. 13% potential increase in price ($156 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($37 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Ontario to Bilbao

Cheapest flights from Ontario to Bilbao
Explore the most affordable flight options available from Ontario to Bilbao. Find the lowest fares from popular airlines and budget airlines, with prices last updated on julio 29, 2025.

This United Airlines deal was found by Cheapflights users on 7/28. 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.
dom. 11/91:29 pmONT - BIO
2 stops18h 11mUnited Airlines
mié. 11/197:25 amBIO - ONT
2 stops19h 09mUnited Airlines
Deal found 7/28$621
This Iberia deal was found by Cheapflights users on 7/28. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/282:37 pmONT - BIO
2 stops17h 18mIberia
lun. 8/48:55 amBIO - ONT
2 stops18h 58mIberia
Deal found 7/28$2,275

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Bilbao 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 julio 29, 2025.
Use the filters below to find and compare flights from Ontario to Bilbao that are best for you.

Fly from

Ontario

Fly to

Bilbao

Route

Depart

Return

Price

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

dom. 11/9

1:29 pm-4:40 pm

2 stops18h 11m

Bilbao

mié. 11/19

7:25 am-5:34 pm

2 stops19h 09m

$621

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

vie. 10/3

9:36 am-11:25 pm

2 stops28h 49m

$540

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

vie. 10/3

2:54 pm-4:55 pm

2 stops17h 01m

$608

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

vie. 10/3

7:05 am-11:15 am

2 stops19h 10m

$1,635

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

sáb. 9/27

6:10 am-12:45 pm

2 stops21h 35m

$4,098

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

mar. 9/30

6:00 am-5:25 pm

2 stops26h 25m

$4,666

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/28

Best time to book a flight from Ontario to Bilbao

Have a flexible travel schedule? Discover the best time to fly to Bilbao 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 Bilbao

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Bilbao (average of $541). Flying from Ontario to Bilbao in June is currently the most expensive (average of $1,135). 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 Bilbao

Get insights into the airlines that provide service to Bilbao. 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 Bilbao. Reviews last updated julio 29, 2025.
Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines from Ontario to Bilbao by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,977 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,977 reviews
Delta
8.0
Very good
7,977 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,899 reviews
Delta
8.0
Very good
7,977 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,977 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Iberia
7.0
Good
2,859 reviews
Delta
8.0
Very good
7,977 reviews

Crew

8.5

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Food

7.3

Overall

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Bilbao. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Ontario to Bilbao one-way?

    One-way options have recently been found by users for as low as $540 on United Airlines. Other airlines that offer cheap prices include Iberia from $608 and Delta from $1,635 one-way.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to Bilbao (average of $541). Flying from Ontario to Bilbao in June is currently the most expensive (average of $1,135). 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.

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