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$265+ Cheap flights from Ontario (ONT) to Barcelona

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 10/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BCN
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Ontario to Barcelona

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Barcelona (S37). 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

$494
(lol.travel)

One-way from

$265
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,030
From Ontario to Barcelona
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One-way flight from Ontario to Barcelona
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Highest demand for flights based on searches. 27% potential increase in price ($344 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($46 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Ontario to Barcelona

Cheapest flights from Ontario to Barcelona
Explore the most affordable flight options available from Ontario to Barcelona. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This lol.travel 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/47:02 amONT - BCN
2 stops40h 18mUnited Airlines
Wed 11/2611:00 amBCN - ONT
2 stops37h 21mUnited Airlines
Deal found 9/11$494
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/67:05 amONT - BCN
1 stop17h 15mDelta
Wed 10/2211:35 amBCN - ONT
1 stop19h 47mDelta
Deal found 9/9$535
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/2410:54 amONT - BCN
1 stop14h 16mBritish Airways
Thu 10/212:20 pmBCN - ONT
1 stop20h 39mBritish Airways
Deal found 9/10$542
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.
Mon 10/61:53 pmONT - BCN
1 stop15h 07mUnited Airlines
Fri 10/243:15 pmBCN - ONT
1 stop16h 15mUnited Airlines
Deal found 9/10$543
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 9/241:42 pmONT - BCN
1 stop15h 18mUnited Airlines
Wed 10/111:15 amBCN - ONT
2 stops18h 09mUnited Airlines
Deal found 9/10$547
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 9/241:42 pmONT - BCN
1 stop15h 18mUnited Airlines
Thu 10/166:50 amBCN - ONT
2 stops23h 34mUnited Airlines
Deal found 9/10$552
This Air Canada 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:41 pmONT - BCN
2 stops31h 04mAir Canada
Tue 12/161:35 pmBCN - ONT
2 stops37h 02mAir Canada
Deal found 9/11$553
This Finnair 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/610:47 amONT - BCN
2 stops35h 18mMultiple Airlines
Wed 12/1712:30 pmBCN - ONT
2 stops18h 58mMultiple Airlines
Deal found 9/11$558
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 10/225:05 amONT - BCN
2 stops17h 45mUnited Airlines
Wed 11/53:05 pmBCN - ONT
1 stop16h 26mUnited Airlines
Deal found 9/10$568
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 11/287:00 amONT - BCN
2 stops29h 20mIberia
Mon 12/86:55 pmBCN - ONT
2 stops25h 35mIberia
Deal found 9/9$572

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Barcelona 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 Barcelona that are best for you.

Fly from

Ontario

Fly to

Barcelona

Route

Depart

Return

Price

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 2/11

10:57 am-8:50 am

1 stop12h 53m

Barcelona-El Prat

Wed 2/25

10:40 am-5:51 pm

1 stop16h 11m

$543

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 9/23

5:10 am-7:50 am

2 stops17h 40m

Barcelona-El Prat

Fri 10/3

3:15 pm-10:30 pm

1 stop16h 15m

$543

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 9/24

6:00 am-2:00 pm

1 stop23h 00m

Barcelona-El Prat

Wed 10/1

3:15 pm-10:30 pm

1 stop16h 15m

$543

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 10/29

7:00 am-1:05 pm

1 stop22h 05m

Barcelona-El Prat

Fri 11/14

3:05 pm-10:31 pm

1 stop16h 26m

$543

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 2/11

7:00 am-9:35 am

2 stops17h 35m

Barcelona-El Prat

Wed 2/25

11:00 am-9:21 pm

2 stops19h 21m

$547

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 9/24

1:42 pm-2:00 pm

1 stop15h 18m

Barcelona-El Prat

Thu 10/16

6:50 am-9:24 pm

2 stops23h 34m

$552

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 10/22

5:05 am-7:50 am

2 stops17h 45m

Barcelona-El Prat

Wed 11/5

3:05 pm-10:31 pm

1 stop16h 26m

$568

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 11/17

5:05 am-9:35 am

2 stops19h 30m

Barcelona-El Prat

Mon 11/24

3:05 pm-10:31 pm

1 stop16h 26m

$593

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 2/25

6:02 am-4:20 pm

2 stops25h 18m

Barcelona-El Prat

Sun 3/1

11:00 am-10:26 pm

2 stops20h 26m

$625

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Fri 12/5

1:35 pm-9:00 am

2 stops34h 25m

Barcelona-El Prat

Tue 12/16

10:30 am-10:49 pm

3 stops45h 19m

$627

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 19 results
1
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Best time to book a flight from Ontario to Barcelona

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

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

Currently, January is the cheapest month in which you can book a flight from Ontario to Barcelona (average of $523). Flying from Ontario to Barcelona in June is currently the most expensive (average of $1,059). 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 BCN?

Find hourly flight availability from Ontario to Barcelona. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

It’s typically best to fly out from Ontario to Barcelona in the afternoon. Doing so could potentially save you 18% on the flight price compared to flying in the evening, which is usually more expensive.

Reviews of airlines servicing Barcelona

Get insights into the airlines that provide service to Barcelona. 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 Barcelona. Reviews last updated September 11, 2025.
Peruse reviews from past customers who have flown with Delta, United Airlines, and American Airlines from Ontario to Barcelona to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

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
7,960 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

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
8,937 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

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
7,960 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

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
2,929 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

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.
British Airways
6.7
Okay
7,361 reviews
Delta
8.0
Very good
7,960 reviews

Entertainment

7.9

Food

7.3

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

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 Barcelona. 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 Barcelona?

    For a flight from Ontario to Barcelona, you will be flying from Ontario. Ontario (ONT) is just 3.1 mi from the center of the city. Ontario is the only Ontario airport and it handles 0 outbound flights to Barcelona per day. 5 airlines have flights to Barcelona from Ontario on a regular basis.

  • How long is the flight from Ontario to Barcelona?

    Airlines like United Airlines fly from Ontario to Barcelona in about 17h 40m. The time it takes to get you to your destination can typically vary by up to . Ontario and Barcelona are separated by a distance of 5971 mi.

  • What are the cheapest airlines flying from Ontario to Barcelona round-trip?

    Currently priced at $544, British Airways will fly you from Ontario to Barcelona and back. In addition to British Airways, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Iberia and Delta - these airlines can fly you to your destination from $605 and $609, respectively. British Airways is currently priced 40% below the average price you’ll pay for this route.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Ontario to Barcelona (average of $523). Flying from Ontario to Barcelona in June is currently the most expensive (average of $1,059). 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

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Alternative routes for Ontario to Barcelona

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Ontario to Barcelona

Discover the top 5 airlines that operate flights from Ontario to Barcelona. 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$544Average$936FlexibilityNo cancel feeOn-time70%
IberiaCheapest$605Average$1,030FlexibilityNo cancel feeOn-time77%
DeltaCheapest$609Average$729FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$662Average$1,040FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$687Average$1,164FlexibilityNo cancel feeOn-time71%

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