ONT - BCN

$350 Find Cheap Flights from Ontario to Barcelona

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Barcelona departing on 2/2. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Barcelona-El Prat Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Barcelona, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Barcelona, as well as popular online travel agencies
Travelers love KAYAK
41.299.237 searches in the past 7 days on KAYAK

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Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$654
Overall average: $737
United Airlines
Wed 3/4Tue 3/10
ONT - BCN • 1 stop
Cheapest one-way
$350
Multiple Airlines
Mon 2/2
ONT - BCN • 3 stops
Top airlines
United Airlines
Cheapest • from $654 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
January
Cheapest • 45% price drop
September
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Barcelona!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Barcelona (ONT-BCN)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Barcelona that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Barcelona

Wed, Mar 4 - Tue, Mar 10
United Airlines Logo
1:50 pm - 3:40 pm
ONT
-
BCN
16h 50m
1 stop
United Airlines Logo
12:35 pm - 10:18 pm
BCN
-
ONT
41h 43m
2 stops
$654United Airlines
Sun, Mar 22 - Thu, Apr 9
United Airlines Logo
11:59 pm - 8:20 am
ONT
-
BCN
24h 21m
2 stops
United Airlines Logo
12:15 pm - 10:26 pm
BCN
-
ONT
43h 11m
2 stops
$659United Airlines
Tue, Feb 3 - Tue, Feb 10
British Airways Logo
4:45 pm - 7:45 pm
ONT
-
BCN
18h 00m
2 stops
British Airways Logo
10:40 am - 6:45 pm
BCN
-
ONT
17h 05m
1 stop
$661British Airways
Mon, Feb 2 - Wed, Feb 18
British Airways Logo
4:45 pm - 7:45 pm
ONT
-
BCN
18h 00m
2 stops
British Airways Logo
10:40 am - 10:49 pm
BCN
-
ONT
21h 09m
1 stop
$663British Airways
Wed, Feb 18 - Wed, Feb 25
British Airways Logo
2:39 pm - 6:25 pm
ONT
-
BCN
18h 46m
2 stops
British Airways Logo
10:40 am - 6:42 pm
BCN
-
ONT
17h 02m
1 stop
$665British Airways
Mon, Feb 2 - Wed, Feb 18
United Airlines Logo
1:24 pm - 9:00 am
ONT
-
BCN
34h 36m
2 stops
United Airlines Logo
11:00 am - 8:50 pm
BCN
-
ONT
42h 50m
2 stops
$666United Airlines
Wed, Feb 18 - Wed, Feb 25
United Airlines Logo
6:09 am - 9:00 am
ONT
-
BCN
17h 51m
2 stops
United Airlines Logo
11:00 am - 10:57 pm
BCN
-
ONT
20h 57m
2 stops
$667United Airlines
Tue, Feb 3 - Wed, Feb 11
British Airways Logo
4:45 pm - 6:25 pm
ONT
-
BCN
16h 40m
2 stops
British Airways Logo
10:40 am - 10:06 am
BCN
-
ONT
32h 26m
1 stop
$668British Airways
Tue, Feb 3 - Thu, Feb 19
British Airways Logo
10:58 am - 8:50 am
ONT
-
BCN
12h 52m
1 stop
British Airways Logo
10:40 am - 6:42 pm
BCN
-
ONT
17h 02m
1 stop
$671British Airways
Sat, Mar 21 - Wed, Apr 8
British Airways Logo
11:58 pm - 12:30 pm
ONT
-
BCN
28h 32m
2 stops
British Airways Logo
10:45 am - 10:35 pm
BCN
-
ONT
20h 50m
1 stop
$672British Airways
Booking Insights

KAYAK's insights & trends for Ontario to Barcelona flights

Get data-powered insights and trends into flights from Ontario to Barcelona to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Ontario to Barcelona-El Prat Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Barcelona-El Prat Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Barcelona-El Prat Airport is January, where tickets cost $540 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is $1,405 and $1,310 respectively.

Good to know

Low seasonJanuary
Cheapest flight$350
Best time to beat the crowds with an average 46% drop in price.
Most popular time to fly with an average 10% increase in price.
Flight from Ontario to Barcelona

When to book flights from Ontario to Barcelona

Are your dates flexible? Find out the best times to travel from Ontario to Barcelona based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Ontario to Barcelona flights

  • What is the cheapest flight from Ontario to Barcelona-El Prat Airport?

    In the last 3 days, the lowest price for a flight from Ontario to Barcelona-El Prat Airport was $350 for a one-way ticket and $654 for a round-trip.

  • Do I need a passport to fly between Ontario and Barcelona?

    Yes

  • Which airports will I be using when flying from Ontario to Barcelona?

    Ontario airport is called Ontario and the only airport in Barcelona is Barcelona-El Prat.

  • Which aircraft models fly most regularly from Ontario to Barcelona?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Ontario to Barcelona?

    Star Alliance, and oneworld are the airline alliances operating flights between Ontario and Barcelona, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Ontario to Barcelona, United Airlines or American Airlines?

    The two airlines most popular with KAYAK users for flights from Ontario to Barcelona are United Airlines and American Airlines. With an average price for the route of $1,104 and an overall rating of 7.4, United Airlines is the most popular choice. American Airlines is also a great choice for the route, with an average price of $1,165 and an overall rating of 7.2.

  • How does KAYAK find such low prices on flights from Ontario to Barcelona?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Barcelona.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Barcelona?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Barcelona from Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Barcelona?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Barcelona with an airline and back to Ontario with another airline. Booking your flights between Ontario and BCN can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Barcelona?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Barcelona from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Ontario to Barcelona

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Barcelona. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Barcelona? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9191 reviews
7.3Comfort
7.1Entertainment
8.1Crew
6.6Food
7.7Boarding
Airline reviews

The flight crew where really good. Better then the crew from BNE to SFO

10.0 ExcellentVanessa, Jan 2026
SFO - IAD
Read more United Airlines reviews

The flight crew where really good. Better then the crew from BNE to SFO

Food should be changed in menu Many muslims travels in this airlime they need to add one Halal meal

left on time, reasonable boarding process arrived early luggage came out quickly

Some flight attendants were great others were cranky. Seats were very tight and sitting on an aisle was very hard as the carts and people walking constantly bumped shoulder and arm.

It was great with United overall except for two things. 1) It was a 5-hour flight and we were with kids, so we were asking for extra snacks. They were extremely reticent to dole them out even though there wasn't any meal and the kids were starting to hit their limit towards the end. 2) Baggage didn't arrive until 80 minutes after we landed.

I’m so sorry, I can’t remember her name, I believe it was Dimpti. She was stellar, also a mature Asian flight attendant, lots of flowers in her hair, just as amazing! But literally the crew was AWESOME . Only downside is there weren’t any charging outlets. Maybe I needed to ask a flight attendant , but it would’ve been nice to have one easily accessible.

I boarded flight UA#1318 at Sacramento International Airport going back to Houston TX. The flight was scheduled at 5:10am. I was able to check in virtually using the United Airlines app. When I entered the airport, there was no one outside assisting with checked bags as it was for Delta Airlines. Immediately upon entering, there was a LONG, EXTREMELY LONG line to the kiosks to get boarding passes. I stand in line to get boarding passes then had to move to ANOTHER EXTREMELY LONG line to get my bags checked in. While standing in this line, we noticed an agent taking customers to 3 at a time to her station to check their bags in. Lucky for me, she called me back, checked my bags for me and I was on my way. I then encountered another long line at the TSA check and to avoid I ending up having to sign up for CLEAR to bypass it. So glad, I did.,...Both of my flights were great with no issues, butthe check in progress at Bush Airport was so much smoother. Check-in at SMF airport needs to be anaylzed and corrected. Do better United, I know you can....thanks

Pushed back only to get deplaned due to a tire damaged by ground crew. They did at least go pretty fast. The bathrooms should be banned under the Geneva convention. No room to even sit straight on the toilet. The under-seat entertainment units block what little leg room there is.

United airlines has the best customer experience from booking to arrival. I always fly United airlines. The mileage program is excellent

from SFO-> FRA flight, AVML meal was significantly less compared to regular meal, especially no Desert, no Bread, no sides.

The entertainment options were at best, fair. It was exactly the same as my outbound flight. It would have been more entertaining if there were some series from Apple TV, HBO, Showtime or other carriers for me to catch up with.

The flight was on time and arrived early. The crew were friendly and helpful.

While I didn’t watch much tv I would have liked a few more options of TV series from Apple TV or hbo max ..

Overall experience was great. Flights were almost on time in departing and we arrived at our destination as scheduled. No issues with amenities or flight crew. Everything went well as as expected. Will fly again with American Airlines in the future!

The flight was very smooth and the meal in business class was great.

I requested a low sodium meal. Reason being, I take medicine for high blood pressure and I wear compression socks on long flights to help with leg swelling. Having less sodium in meals really helps me feel better on long flights. I received my initial low sodium meal after takeoff. Just before landing, the crew came through with the meal cart and offered me what was being served. I said no thank you and then noticed my low sodium meal in the meal cart, with my name and seat assignment on it. I motioned to the crew member, but he grabbed the meal cart and proceeded to move to the rear of the aircraft. He didn’t see me or other passengers who had attempted to get this attention. He was more concerned about completing meal service since we were due to land in under 45 minutes. I pressed the call light five times from my seat to receive help, but no crew member responded to me. So, I didn’t receive a second meal, one that I requested (the low sodium option). This led me to have a migraine from only eating one meal on an 11-hour flight. This is why I’m not a fan of flying US-based airlines overseas. The crew members continue to show the absolute worst customer service experience. I would not recommend flying American for overseas flights.

Not great. Booked Extra seats and got nothing extra at all. It’s basically a big budget airline.

Horrible. Both legs of my flight were delayed more than 6 hours. No compensation, no screens on the plane, and the plane was not clean.

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

The flight was flawless and we even arrived between 20 and 25 minutes early!

Bad weather Excelent pilot Spoke British 😆on time seats small ad expected in a discount airline

It wasn’t great because the third-party from Kayak there was just no information about how to check in with Vueling. And the purchase of the ticket from under pricer just made everything really difficult. I’m unlikely to use Kayak again for these reasons.

It was fine, older plane with limited entertainment, otherwise fine.

the seats were bad and uncomfortable and the food was not tasty.

the seats were so cramped you could barely move. it was difficult to eat when passengers would recline their seats. the seats were so flimsy and unstable that whenever someone got in and out of their seat, it bounced like a spring back in your face. the movies were nice. the food was terrible. even though the conditions were terrible, they tried to pressure passengers to relocate their seats to accommodate adults who were related and wanted to sit next to each other, even after the passengers expressed that they did not want to move for that purpose. on the connecting flight, the “service” consisted of items for purchase. even though the flight was only 45 minutes, once again passengers (including me) were pressured to relocate for people to sit next to each other. they couldn’t be apart for 45 minutes? this was much less compelling than being apart for an 8 hour flight.

Everything went smoothly, and we even arrived 40min earlier than scheduled, on an Orland-Madrid route.

It was budget airline Veuling, even though we booked Iberia.

The staff was very nice and helpful. Some of the best crew I have met.

Bad experience. The seat room are very tight. The food is not good and the breakfast has no hot drink.

Suddenly, I don't find my flight back on the app Help Ticket 0757345716866 Hoeflich Flight back Sunday ib5333 Ib2629 Ib4268

The issue was not with BA it was with the link yoiu sent fopr booking the flight

Loved the boarding option from Business class lounge, experience on flight was excellent, plenty of good food choices

Awful it always is unfortunately is the only way to fly direct to london

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

Airlines have to stop assuming passengers bring entertainment. Provide it like you used to in business class and above!! N

Need to offer Better food from LAX to London Service from London to Delhi very delayed after take off.

Great crew and food and beverage. Seating tight but not the airline's fault. Will definitely fly BA in future!

Crying baby the ENTIRE flight. Not your fault, but I paid 2700 for a premium economy ticket and it wasn't worth it. should have just stuck with coach. flight attendants very mediocre - minimal effort. Plane didn't seem very clean. Didn't have any cleansing wipes - most airlines give you this when you board. Flat screen scrolling didn't work. Toiletry case a joke - why bother at all?

Enjoyable flight, helpful crew everything was organized to accommodate passengers.

I was transferred to an American Airlines flight. The boarding was late and unorganized. The seating was extremely tight and uncomfortable. Will not use AA again.

Everything you need to know for your flight from Ontario to Barcelona

Information on your arrival and departure airports