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$435+ 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 5/12. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BCN
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
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 March 26, 2025.

Round-trip from

$859
(United Airlines)

One-way from

$435
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$666
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. 23% potential increase in price ($264 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($30 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 26, 2025.

This United Airlines deal was found by Cheapflights users on 3/25. 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 10/1310:40 amONT - BCN
1 stop18h 20mUnited Airlines
Fri 10/244:00 pmBCN - ONT
1 stop15h 53mUnited Airlines
Deal found 3/25$749
This Finnair deal was found by Cheapflights users on 3/24. 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.
Fri 10/1710:55 amONT - BCN
2 stops17h 25mMultiple Airlines
Sat 11/111:00 amBCN - ONT
2 stops21h 02mMultiple Airlines
Deal found 3/24$854
This Air Canada deal was found by Cheapflights users on 3/25. 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 5/104:15 pmONT - BCN
3 stops30h 35mAir Canada
Sat 5/241:50 pmBCN - ONT
3 stops31h 41mAir Canada
Deal found 3/25$940
This oojo deal was found by Cheapflights users on 3/25. 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.
Sat 5/1011:59 pmONT - BCN
1 stop25h 11mBritish Airways
Sat 5/247:40 amBCN - ONT
2 stops19h 43mBritish Airways
Deal found 3/25$955
This AirNGo deal was found by Cheapflights users on 3/25. 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 AirNGo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1710:15 pmONT - BCN
1 stop26h 05mKLM
Fri 5/211:35 amBCN - ONT
1 stop20h 01mKLM
Deal found 3/25$1,047
This Delta deal was found by Cheapflights users on 3/26. 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 4/1710:15 pmONT - BCN
1 stop26h 05mDelta
Fri 5/211:35 amBCN - ONT
1 stop16h 53mDelta
Deal found 3/26$1,061
This Iberia deal was found by Cheapflights users on 3/25. 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.
Thu 4/1710:54 amONT - BCN
1 stop14h 16mIberia
Fri 5/212:20 pmBCN - ONT
1 stop20h 30mIberia
Deal found 3/25$1,072
This American Airlines deal was found by Cheapflights users on 3/25. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1710:54 amONT - BCN
1 stop14h 16mAmerican Airlines
Fri 5/212:20 pmBCN - ONT
1 stop18h 50mAmerican Airlines
Deal found 3/25$1,261
This Priceline deal was found by Cheapflights users on 3/24. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/1011:25 pmONT - BCN
2 stops24h 35mAvianca
Mon 5/192:00 pmBCN - ONT
2 stops40h 55mAvianca
Deal found 3/24$1,425

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 March 26, 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

Mon 5/12

6:48 pm-2:00 pm

1 stop34h 12m

Barcelona-El Prat

Thu 5/22

12:10 pm-5:25 pm

2 stops38h 15m

$859

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 4/29

7:00 am-9:20 am

1 stop17h 20m

Barcelona-El Prat

Fri 5/9

11:35 am-7:33 pm

1 stop16h 58m

$876

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sat 5/10

4:15 pm-7:50 am

3 stops30h 35m

Barcelona-El Prat

Sat 5/24

1:50 pm-12:31 pm

3 stops31h 41m

$940

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Fri 8/22

6:00 am-7:50 am

2 stops16h 50m

Barcelona-El Prat

Fri 9/5

1:15 pm-10:53 pm

2 stops18h 38m

$942

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sat 5/10

11:59 pm-10:10 am

1 stop25h 11m

Barcelona-El Prat

Sat 5/24

7:40 am-6:23 pm

2 stops19h 43m

$955

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Thu 4/17

10:15 pm-9:20 am

1 stop26h 05m

Barcelona-El Prat

Fri 5/2

11:35 am-10:36 pm

1 stop20h 01m

$1,047

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Thu 4/17

10:54 am-10:10 am

1 stop14h 16m

Barcelona-El Prat

Fri 5/2

12:20 pm-11:50 pm

1 stop20h 30m

$1,072

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Thu 4/17

10:54 am-10:10 am

1 stop14h 16m

Barcelona-El Prat

Fri 5/2

12:20 pm-10:10 pm

1 stop18h 50m

$1,261

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sat 5/10

11:25 pm-9:00 am

2 stops24h 35m

Barcelona-El Prat

Mon 5/19

2:00 pm-9:55 pm

2 stops40h 55m

$1,425

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 5/12

2:06 pm-12:15 am

3 stops49h 09m

$435

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 18 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

How far ahead should I book a flight from Ontario to Barcelona?

Use this chart to determine the optimal time to book a round-trip flight from Ontario to Barcelona. Price data was last updated on March 21, 2025.

The price you pay for your flight from Ontario to Barcelona may vary depending on when you book. For the best chance of a lower fare, look to book 41 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 $1,080). 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 March 26, 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.

What is the cheapest day to fly from Ontario to Barcelona?

Use this chart to determine the cheapest time to fly round-trip from Ontario to Barcelona. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to Barcelona flight should consider departing on Wednesday at noon when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Rainfall in Barcelona by month

Plan your trip to Barcelona by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Barcelona ranges from 0.8 - 3.6 inches per month. October is typically the wettest month, when rainfall can reach 3.6 in. July is typically the driest time to visit Barcelona when rainfall is around 0.8 in.

Temperature in Barcelona by month

Plan your trip to Barcelona by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Barcelona, 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 75.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 48.2 F).

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 March 26, 2025.
Peruse reviews from past customers who have flown with Delta, KLM and United 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
7,891 reviews

Comfort

8.0

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

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
7,891 reviews
Delta
8.0
Very good
7,891 reviews

Comfort

8.0

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

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.
KLM
7.8
Good
1,318 reviews
Delta
8.0
Very good
7,891 reviews

Comfort

8.0

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

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
8,608 reviews
Delta
8.0
Very good
7,891 reviews

Comfort

8.0

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

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
7,891 reviews

Comfort

8.0

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

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.
WestJet
7.2
Good
2,785 reviews
Delta
8.0
Very good
7,891 reviews

Comfort

8.0

Crew

8.5

Overall

8.0

Boarding

8.2

Food

7.3

Entertainment

7.9

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. 6 airlines have flights to Barcelona from Ontario on a regular basis.

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

    Currently priced at $859, United Airlines will fly you from Ontario to Barcelona and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and Air Canada - these airlines can fly you to your destination from $876 and $940, respectively.

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

    One-way options have recently been found by users for as low as $629 on British Airways. Other airlines that offer cheap prices include Air Canada from $630 and KLM from $632 one-way.

  • 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 $1,080). 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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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 6 airlines flying from Ontario to Barcelona

Discover the top 6 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 March 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$551Average$936FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$554Average$1,159FlexibilityNo cancel feeOn-time71%
DeltaCheapest$567Average$729FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$582Average$1,032FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$690Average$1,032FlexibilityNo cancel feeOn-time67%
IberiaCheapest$716Average$1,086FlexibilityNo cancel feeOn-time77%
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