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$352+ 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 3/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BCN
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
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 October 30, 2025.

Round-trip from

$683
(Delta)

One-way from

$352
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$830
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 ($347 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($45 potential savings vs. average RT price).
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Average for round-trip flights in October 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 October 30, 2025.

This Delta deal was found by Cheapflights users on 10/30. 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 11/177:05 amONT - BCN
1 stop16h 35mDelta
Tue 12/1610:55 amBCN - ONT
1 stop21h 09mDelta
Deal found 10/30$683
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Thu 10/307:00 amONT - BCN
1 stop22h 10mUnited Airlines
Tue 11/181:35 pmBCN - ONT
2 stops41h 56mUnited Airlines
Deal found 10/28$710
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Fri 10/311:29 pmONT - BCN
2 stops15h 41mUnited Airlines
Tue 11/181:35 pmBCN - ONT
3 stops42h 16mUnited Airlines
Deal found 10/28$715
This oojo deal was found by Cheapflights users on 10/30. 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.
Sun 11/2310:47 amONT - BCN
2 stops18h 18mBritish Airways
Wed 12/38:40 pmBCN - ONT
2 stops34h 20mBritish Airways
Deal found 10/30$729
This United Airlines deal was found by Cheapflights users on 10/29. 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 10/307:00 amONT - BCN
1 stop22h 10mUnited Airlines
Wed 11/193:05 pmBCN - ONT
1 stop16h 26mUnited Airlines
Deal found 10/29$733
This United Airlines deal was found by Cheapflights users on 10/30. 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 11/115:05 amONT - BCN
2 stops19h 30mUnited Airlines
Sun 11/163:05 pmBCN - ONT
1 stop16h 26mUnited Airlines
Deal found 10/30$783
This Delta deal was found by Cheapflights users on 10/30. 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.
Thu 11/67:05 amONT - BCN
1 stop16h 35mDelta
Thu 11/2010:55 amBCN - ONT
1 stop17h 47mDelta
Deal found 10/30$838
This United Airlines deal was found by Cheapflights users on 10/28. 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.
Wed 12/35:05 amONT - BCN
2 stops27h 30mUnited Airlines
Sat 12/276:50 amBCN - ONT
2 stops24h 35mUnited Airlines
Deal found 10/28$859
This United Airlines deal was found by Cheapflights users on 10/30. 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 11/146:05 amONT - BCN
2 stops17h 55mUnited Airlines
Sun 11/163:05 pmBCN - ONT
1 stop16h 26mUnited Airlines
Deal found 10/30$862
This United Airlines deal was found by Cheapflights users on 10/30. 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 11/97:00 amONT - BCN
1 stop21h 10mUnited Airlines
Sun 11/163:05 pmBCN - ONT
1 stop16h 26mUnited Airlines
Deal found 10/30$883

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 October 30, 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

Tue 1/13

6:00 am-9:00 am

2 stops18h 00m

Barcelona-El Prat

Tue 1/20

11:00 am-10:53 pm

2 stops20h 53m

$687

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 2/25

6:00 am-8:00 am

2 stops17h 00m

Barcelona-El Prat

Sun 3/1

10:15 am-11:38 am

2 stops34h 23m

$737

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 2/25

5:00 am-9:00 am

2 stops19h 00m

Barcelona-El Prat

Sun 3/1

5:30 pm-5:41 pm

1 stop33h 11m

$743

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 3/4

7:10 am-8:50 am

1 stop16h 40m

Barcelona-El Prat

Sat 3/14

10:40 am-11:43 pm

1 stop21h 03m

$815

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 3/2

7:10 am-8:50 am

1 stop16h 40m

Barcelona-El Prat

Mon 3/16

10:40 am-10:02 pm

1 stop19h 22m

$836

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Fri 11/14

6:05 am-9:00 am

2 stops17h 55m

Barcelona-El Prat

Sun 11/16

3:05 pm-10:31 pm

1 stop16h 26m

$862

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sun 11/9

7:00 am-1:10 pm

1 stop21h 10m

Barcelona-El Prat

Sun 11/16

3:05 pm-10:31 pm

1 stop16h 26m

$883

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 11/11

5:05 am-9:35 am

2 stops19h 30m

Barcelona-El Prat

Wed 11/19

3:05 pm-10:31 pm

1 stop16h 26m

$883

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Fri 1/23

8:55 am-1:15 pm

2 stops19h 20m

Barcelona-El Prat

Tue 1/27

11:50 am-9:45 pm

2 stops18h 55m

$891

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 2/25

1:00 pm-8:40 am

1 stop34h 40m

Barcelona-El Prat

Sun 3/1

10:55 am-9:14 pm

1 stop19h 19m

$923

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 22 results
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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, October is the cheapest month in which you can book a flight from Ontario to Barcelona (average of $378). Flying from Ontario to Barcelona in June is currently the most expensive (average of $610). 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 October 30, 2025.

It’s typically best to fly out from Ontario to Barcelona in the afternoon. Doing so could potentially save you 12% on the flight price compared to flying in the evening, which is usually more expensive.

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

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 October 30, 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
7.9
Good
7,998 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

7.9

Entertainment

7.9

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
7.9
Good
7,998 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

7.9

Entertainment

7.9

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
8,996 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

7.9

Entertainment

7.9

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
11,034 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

7.9

Entertainment

7.9

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
3,004 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

7.9

Entertainment

7.9

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
7,488 reviews
Delta
7.9
Good
7,998 reviews

Comfort

7.9

Boarding

8.2

Food

7.3

Overall

7.9

Entertainment

7.9

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, Delta, and British Airways fly from Ontario to Barcelona in about 16h 40m. The time it takes to get you to your destination can typically vary by up to 1h 20m. Ontario and Barcelona are separated by a distance of 5971 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 41% 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, October is the cheapest month in which you can book a flight from Ontario to Barcelona (average of $378). Flying from Ontario to Barcelona in June is currently the most expensive (average of $610). 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

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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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$544Average$882FlexibilityNo cancel feeOn-time70%
IberiaCheapest$605Average$1,058FlexibilityNo cancel feeOn-time77%
DeltaCheapest$609Average$729FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$682Average$1,077FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$687Average$1,164FlexibilityNo cancel feeOn-time71%

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