HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Bilbao

$559+ Cheap flights from Ontario (ONT) to Bilbao (BIO)

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 12/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BIO
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Bilbao 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 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 September 11, 2025.

Round-trip from

$559
(United Airlines)

Popular in

December

Cheapest in

March

Average price

$1,161
From Ontario to Bilbao
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($166 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($41 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/9. 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.
Mon 12/17:00 amONT - BIO
2 stops20h 50mUnited Airlines
Mon 12/86:45 amBIO - ONT
2 stops22h 57mUnited Airlines
Deal found 9/9$559
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/266:05 amONT - BIO
2 stops33h 00mUnited Airlines
Sun 11/25:45 amBIO - ONT
2 stops24h 46mUnited Airlines
Deal found 9/10$742
This United Airlines deal was found by Cheapflights users on 9/9. 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 10/77:02 amONT - BIO
2 stops19h 03mUnited Airlines
Tue 10/142:10 pmBIO - ONT
2 stops31h 03mUnited Airlines
Deal found 9/9$867
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Sat 10/256:00 amONT - BIO
2 stops28h 05mUnited Airlines
Sat 11/16:45 amBIO - ONT
2 stops18h 49mUnited Airlines
Deal found 9/10$910
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Fri 10/246:00 amONT - BIO
2 stops26h 50mUnited Airlines
Fri 10/316:45 amBIO - ONT
2 stops23h 46mUnited Airlines
Deal found 9/9$989
This United Airlines deal was found by Cheapflights users on 9/8. 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 9/186:04 amONT - BIO
2 stops19h 41mUnited Airlines
Wed 9/2412:30 pmBIO - ONT
2 stops19h 00mUnited Airlines
Deal found 9/8$1,061
This United Airlines deal was found by Cheapflights users on 9/11. 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 9/167:00 amONT - BIO
2 stops18h 45mUnited Airlines
Tue 10/286:45 amBIO - ONT
2 stops18h 49mUnited Airlines
Deal found 9/11$1,081
This United Airlines deal was found by Cheapflights users on 9/10. 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 11/207:00 amONT - BIO
2 stops20h 50mUnited Airlines
Sat 11/296:45 amBIO - ONT
2 stops19h 49mUnited Airlines
Deal found 9/10$1,146
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Tue 12/161:34 pmONT - BIO
2 stops18h 06mUnited Airlines
Wed 1/711:35 amBIO - ONT
2 stops20h 18mUnited Airlines
Deal found 9/10$1,247
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Wed 10/87:02 amONT - BIO
2 stops24h 03mUnited Airlines
Wed 10/152:10 pmBIO - ONT
2 stops17h 42mUnited Airlines
Deal found 9/10$1,336
This Iberia deal was found by Cheapflights users on 9/9. 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.
Fri 10/2410:57 amONT - BIO
2 stops16h 48mIberia
Sun 11/29:15 amBIO - ONT
2 stops22h 00mIberia
Deal found 9/9$1,352
This United Airlines deal was found by Cheapflights users on 9/9. 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 10/227:02 amONT - BIO
2 stops30h 23mUnited Airlines
Fri 11/711:35 amBIO - ONT
2 stops38h 59mUnited Airlines
Deal found 9/9$1,425

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 September 11, 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

Mon 12/1

7:00 am-12:50 pm

2 stops20h 50m

Bilbao

Mon 12/8

6:45 am-8:42 pm

2 stops22h 57m

$559

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

Fri 2/13

7:00 am-12:00 pm

2 stops20h 00m

Bilbao

Sat 2/21

6:45 am-8:45 pm

2 stops23h 00m

$590

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

Wed 3/4

6:45 am-4:30 pm

2 stops24h 45m

Bilbao

Sun 3/8

11:55 am-11:52 pm

2 stops43h 57m

$710

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

Wed 3/4

6:00 am-11:30 am

2 stops20h 30m

Bilbao

Sun 3/8

4:50 pm-11:38 am

2 stops50h 48m

$728

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

Sun 10/26

6:05 am-11:05 pm

2 stops33h 00m

Bilbao

Sun 11/2

5:45 am-10:31 pm

2 stops24h 46m

$742

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

Sat 10/25

6:00 am-7:05 pm

2 stops28h 05m

Bilbao

Sat 11/1

6:45 am-5:34 pm

2 stops18h 49m

$910

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

Fri 10/24

6:00 am-5:50 pm

2 stops26h 50m

Bilbao

Fri 10/31

6:45 am-10:31 pm

2 stops23h 46m

$989

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

Thu 11/20

7:00 am-12:50 pm

2 stops20h 50m

Bilbao

Sat 11/29

6:45 am-5:34 pm

2 stops19h 49m

$1,146

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

Tue 12/16

1:34 pm-4:40 pm

2 stops18h 06m

Bilbao

Wed 1/7

11:35 am-10:53 pm

2 stops20h 18m

$1,247

OntarioBilbao

ONT - BIO

ONTBIO

Ontario

Wed 10/8

7:02 am-4:05 pm

2 stops24h 03m

Bilbao

Wed 10/15

2:10 pm-10:52 pm

2 stops17h 42m

$1,336

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 11 results
1
2

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 $1,136). 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.

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.

  • How long is the flight from Ontario to Bilbao?

    For as low as $559, United Airlines can have you in Bilbao from Ontario in 20h 50m. There are 5689 mi between Ontario and Bilbao. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 $1,136). 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.

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.