HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Barcelona

$482+ 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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — BCN
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to Barcelona 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 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 December 23, 2025.

This KLM deal was found by Cheapflights users on 12/21. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2210:29 pmONT - BCN
1 stop23h 46mKLM
Mon 12/296:00 amBCN - ONT
2 stops19h 12mKLM
Deal found 12/21$1,405
This Delta deal was found by Cheapflights users on 12/21. 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 12/225:10 pmONT - BCN
2 stops29h 05mDelta
Mon 12/296:00 amBCN - ONT
2 stops19h 12mDelta
Deal found 12/21$1,409
This United Airlines deal was found by Cheapflights users on 12/22. 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 12/246:04 amONT - BCN
2 stops17h 56mUnited Airlines
Sun 12/2811:00 amBCN - ONT
2 stops20h 41mUnited Airlines
Deal found 12/22$1,453
This KLM deal was found by Cheapflights users on 12/21. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/257:05 amONT - BCN
1 stop15h 10mKLM
Sun 12/2810:55 amBCN - ONT
1 stop17h 55mKLM
Deal found 12/21$1,476
This United Airlines deal was found by Cheapflights users on 12/21. 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 12/256:04 amONT - BCN
2 stops17h 56mUnited Airlines
Sun 12/2810:30 amBCN - ONT
2 stops21h 11mUnited Airlines
Deal found 12/21$1,503
This United Airlines deal was found by Cheapflights users on 12/22. 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 12/265:05 amONT - BCN
2 stops19h 30mUnited Airlines
Sun 12/2810:30 amBCN - ONT
2 stops21h 11mUnited Airlines
Deal found 12/22$1,506
This oojo deal was found by Cheapflights users on 12/21. 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.
Fri 12/264:47 pmONT - BCN
2 stops18h 03mBritish Airways
Mon 12/299:00 pmBCN - ONT
2 stops32h 58mBritish Airways
Deal found 12/21$1,640
This United Airlines deal was found by Cheapflights users on 12/22. 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 12/2511:59 pmONT - BCN
2 stops24h 36mUnited Airlines
Thu 1/11:35 pmBCN - ONT
2 stops32h 03mUnited Airlines
Deal found 12/22$1,646
This oojo deal was found by Cheapflights users on 12/22. 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.
Tue 12/234:44 pmONT - BCN
2 stops16h 41mBritish Airways
Tue 12/3010:05 amBCN - ONT
2 stops20h 47mBritish Airways
Deal found 12/22$1,647
This oojo deal was found by Cheapflights users on 12/21. 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 12/2412:55 pmONT - BCN
2 stops21h 50mBritish Airways
Wed 12/318:40 pmBCN - ONT
2 stops33h 18mBritish Airways
Deal found 12/21$1,801
This KLM deal was found by Cheapflights users on 12/22. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:05 amONT - BCN
1 stop16h 35mKLM
Sun 12/2810:55 amBCN - ONT
1 stop17h 55mKLM
Deal found 12/22$1,824

Find 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 December 23, 2025.

Round-trip from

$614
(Iberia)

One-way from

$482
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$1,505
From Ontario to Barcelona
Search Deals
One-way flight from Ontario to Barcelona
Search Deals
High demand for flights, 5% potential price rise
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($46 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 23, 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 1/20

3:09 pm-5:20 pm

2 stops17h 11m

Barcelona-El Prat

Wed 1/28

10:40 am-10:48 pm

1 stop21h 08m

$832

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 2/11

7:16 am-8:50 am

1 stop16h 34m

Barcelona-El Prat

Wed 2/25

10:40 am-10:49 pm

1 stop21h 09m

$841

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 2/23

10:59 am-8:50 am

1 stop12h 51m

Barcelona-El Prat

Wed 3/4

10:40 am-10:49 pm

1 stop21h 09m

$841

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 2/4

9:05 am-1:15 pm

2 stops19h 10m

Barcelona-El Prat

Tue 2/24

11:50 am-10:44 pm

2 stops19h 54m

$877

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sun 1/18

4:45 pm-10:30 pm

2 stops20h 45m

Barcelona-El Prat

Sun 1/25

10:40 am-6:45 pm

1 stop17h 05m

$882

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Mon 3/9

2:47 pm-5:55 pm

2 stops19h 08m

Barcelona-El Prat

Mon 3/16

10:40 am-10:30 pm

1 stop19h 50m

$882

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Tue 2/10

4:45 pm-6:25 pm

2 stops16h 40m

Barcelona-El Prat

Sun 2/15

10:40 am-10:49 pm

1 stop21h 09m

$882

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sun 2/8

10:58 am-8:50 am

1 stop12h 52m

Barcelona-El Prat

Sun 2/15

10:40 am-6:39 pm

1 stop16h 59m

$891

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Sun 3/1

10:59 am-8:50 am

1 stop12h 51m

Barcelona-El Prat

Tue 3/10

10:40 am-10:48 pm

1 stop20h 08m

$893

OntarioBarcelona

ONT - BCN

ONTBCN

Ontario

Wed 1/14

6:00 am-9:35 am

2 stops18h 35m

Barcelona-El Prat

Wed 1/21

11:00 am-10:53 pm

2 stops20h 53m

$896

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Showing 1-10 of 21 results
1
2
3

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 $367). Flying from Ontario to Barcelona in June is currently the most expensive (average of $612). 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 December 23, 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.

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 December 23, 2025.
Peruse reviews from past customers who have flown with United Airlines, American Airlines, and Iberia 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.
United Airlines
7.4
Good
9,106 reviews

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
9,106 reviews
United Airlines
7.4
Good
9,106 reviews

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
American Airlines
7.2
Good
11,050 reviews
United Airlines
7.4
Good
9,106 reviews

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
Iberia
7.0
Good
3,056 reviews
United Airlines
7.4
Good
9,106 reviews

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
British Airways
6.7
Okay
7,606 reviews
United Airlines
7.4
Good
9,106 reviews

Entertainment

7.1

Overall

7.4

Crew

8.1

Comfort

7.3

Food

6.6

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

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

  • How long is the flight from Ontario to Barcelona?

    Airlines like British Airways fly from Ontario to Barcelona in about 17h 11m. 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 United Airlines - these airlines can fly you to your destination from $605 and $688, respectively. British Airways is currently priced 46% 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 $367). Flying from Ontario to Barcelona in June is currently the most expensive (average of $612). 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.

Alternative routes for Ontario to Barcelona

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Barcelona-El Prat flights
Los Angeles to Barcelona-El Prat flights
Ontario to Barcelona-El Prat flights
Santa Ana to Barcelona-El Prat flights
San Jose to Barcelona-El Prat flights
San Diego to Barcelona-El Prat flights
Oakland to Barcelona-El Prat flights
Las Vegas to Barcelona-El Prat flights
Sacramento to Barcelona-El Prat flights
Fresno to Barcelona-El Prat flights
Burbank to Barcelona-El Prat flights
Reno to Barcelona-El Prat flights
Long Beach to Barcelona-El Prat flights
Palm Springs to Barcelona-El Prat flights
Medford to Barcelona-El Prat flights
San Luis Obispo to Barcelona-El Prat flights
Santa Barbara to Barcelona-El Prat flights
Los Angeles to Reus flights
Monterey to Barcelona-El Prat flights
San Francisco to Costa Brava flights
San Francisco to Lleida flights
San Francisco to Reus flights
Los Angeles to Costa Brava flights
Las Vegas to Costa Brava flights

Top 4 airlines flying from Ontario to Barcelona

Discover the top 4 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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$544Average$820FlexibilityNo cancel feeOn-time70%
IberiaCheapest$605Average$1,084FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$688Average$1,100FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$1,005Average$1,165FlexibilityNo cancel feeOn-time71%

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.