ONT - OTP

$331 Find Cheap Flights from Ontario to Bucharest

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 Otopeni Intl departing on 10/21. 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 Bucharest Otopeni Intl Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Bucharest, 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 Bucharest, 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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Everything you should know

Cheapest round-trip
$724
United Airlines
Mon 7/27Wed 8/19
ONT - OTP • 2 stops
Cheapest one-way
$331
British Airways
Wed 10/21
ONT - OTP • 2 stops
Top airlines
Cheapest • from $724 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Ontario and Otopeni Intl. You'll need at least 2 connections.
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We hope you love your trip to Otopeni Intl!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Otopeni Intl (ONT-OTP)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Otopeni Intl 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 Otopeni Intl

Mon, Jul 27 - Wed, Aug 19
United Airlines Logo
1:18 pm - 6:35 pm
ONT
-
OTP
19h 17m
2 stops
United Airlines Logo
6:15 am - 8:53 pm
OTP
-
ONT
24h 38m
2 stops
$724United Airlines
Tue, Nov 24 - Tue, Dec 8
British Airways Logo
4:47 pm - 10:55 pm
ONT
-
OTP
20h 08m
2 stops
British Airways Logo
8:00 am - 10:00 pm
OTP
-
ONT
24h 00m
2 stops
$725British Airways
Wed, Oct 21 - Wed, Nov 4
United Airlines Logo
6:05 am - 4:20 pm
ONT
-
OTP
24h 15m
2 stops
United Airlines Logo
7:10 pm - 10:26 pm
OTP
-
ONT
37h 16m
2 stops
$749United Airlines
Mon, Aug 3 - Wed, Sep 30
United Airlines Logo
6:39 pm - 1:10 am
ONT
-
OTP
20h 31m
2 stops
United Airlines Logo
1:45 pm - 10:59 pm
OTP
-
ONT
19h 14m
2 stops
$753United Airlines
Sun, Jul 26 - Wed, Aug 19
United Airlines Logo
6:10 am - 12:00 pm
ONT
-
OTP
19h 50m
2 stops
United Airlines Logo
6:15 am - 8:53 pm
OTP
-
ONT
24h 38m
2 stops
$754United Airlines
Wed, Aug 5 - Tue, Oct 6
Lufthansa Logo
6:10 am - 12:00 pm
ONT
-
OTP
19h 50m
2 stops
Lufthansa Logo
6:15 am - 5:51 pm
OTP
-
ONT
21h 36m
2 stops
$756Lufthansa
Sun, Sep 13 - Mon, Sep 28
United Airlines Logo
1:18 pm - 1:10 am
ONT
-
OTP
25h 52m
2 stops
United Airlines Logo
6:55 pm - 10:26 pm
OTP
-
ONT
37h 31m
2 stops
$767United Airlines
Sun, Nov 1 - Sat, Nov 14
Lufthansa Logo
6:53 pm - 6:35 pm
ONT
-
OTP
37h 42m
2 stops
Lufthansa Logo
2:35 pm - 11:06 pm
OTP
-
ONT
18h 31m
2 stops
$768Lufthansa
Sun, Nov 1 - Sat, Nov 14
Multiple Airlines Logo
9:55 am - 3:50 pm
ONT
-
OTP
19h 55m
2 stops
Multiple Airlines Logo
6:00 am - 6:18 pm
OTP
-
ONT
22h 18m
2 stops
$769Multiple Airlines
Fri, Jul 24 - Wed, Aug 19
United Airlines Logo
6:39 pm - 1:10 am
ONT
-
OTP
20h 31m
2 stops
United Airlines Logo
6:15 am - 8:53 pm
OTP
-
ONT
24h 38m
2 stops
$814United Airlines
Booking Insights

KAYAK's insights & trends for Ontario to Otopeni Intl flights

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

Which airlines provide the cheapest flights from Ontario to Bucharest?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 7 days.

In the past 7 days, the cheapest round-trip tickets from Ontario to Bucharest were found on United Airlines ($724) and British Airways ($725).

Good to know

Cheapest flight$331
Flight from Ontario to Bucharest

When to book flights from Ontario to Otopeni Intl

Are your dates flexible? Find out the best times to travel from Ontario to Otopeni Intl 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 Bucharest flights

  • What is the cheapest flight from Ontario to Bucharest Otopeni Intl Airport?

    In the last 7 days, the lowest price for a flight from Ontario to Bucharest Otopeni Intl Airport was $331 for a one-way ticket and $724 for a round-trip.

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

    A passport is required to fly from Ontario to Bucharest.

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

    When flying out of Ontario you will be using Ontario. You will be landing at Bucharest, also known as Bucharest Otopeni Intl.

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

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

  • Which airline alliances offer flights from Ontario to Bucharest?

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Bucharest are Delta and United Airlines. With an average price for the route of $869 and an overall rating of 7.9, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $614 and an overall rating of 7.4.

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

    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 Bucharest.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Bucharest 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 Bucharest?

    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 Bucharest with an airline and back to Ontario with another airline. Booking your flights between Ontario and OTP 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 Bucharest?

    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 Bucharest 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 airlines flying from Ontario to Otopeni Intl

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Bucharest. 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 Otopeni Intl? 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.
7.9
DeltaOverall score based on 8419 reviews
8.5Crew
8.1Boarding
7.8Entertainment
7.8Comfort
7.2Food
Airline reviews

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

10.0 ExcellentTeresa, Apr 2026
SMF - LAX
Read more Delta reviews

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

N Everything was perfect from boarding to assistance to baggage in Tampa

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

Fast, lovely scenery, great info on the Delta flight screen about landmarks we were flying over. Great landing!

Long flight but comfortable and not freezing as I have experienced on Hawaiian flights to the islands. They gave us blankets just in case. Nice touch.

I took seat 15A in anticipation of window seat, there is no window.

Flight late, the waited for a long time for “personal” to arrive at gate to dock the plane in Rochester. So annoying. This flight was expected, why aren’t personel available for the jet bridge?

My recent experience was excellent on Delta! I flew with Delta Comfort and I was really comfortable in my seat. I enjoyed the in-flight service. The flight attendants were so friendly and hospitable. I love the snack on the flight as well. This was my first time flying on Delta and I will definitely consider flying with them again.

My flight was canceled on Sunday. Rebooking took three hours. Had to pay for accommodations another night. New flight was delayed for 5 hours, all that was sent was a 12 dollar food voucher, which doesn’t tell you how to use it. Then when we landed we had to sit on the plane for an hour before we could get off.

Flight was delayed but more than 90 minutes. This caused me to miss my available windows for pick-up by a friend. I had to pay $125 for an uber back home from the airport which was an added expense that I had not budgeted for my trip. Staff was friendly.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

Easy of boarding, helpfully staff at check in, surprisingly comfortable seating

Lost of requested seat assignments. Lost my husband's meal choice

My service dog and I were asked to deplane just before they closed the door - clearly very last minute they couldn’t find the documentation that I have filled out many many times before that is for flying service animals. I purposely purchase 3seats (a whole row) since he is large and not all passengers want to sit next to a dog on a cross country flight. The plane departed with my husband on it!!! They made me fill out a hard copy of the same form and had to reschedule me on a later flight where they could find 3 seats together!! I’ve done this so many times before - clearly the error was on their part in a technology glitch - but really people - do better!! Very traumatic - and my husband had to wait for us when he landed ….so bad. Poor pup was confused and tired.

Late plane. Only one crew on the ground so we b had to wait for Denver flight to come in, board, and depart. At 78 yrs of age I was not pleased trying to get my connection. What really made me angry was the notification you sent me to hurry up or I would miss my connection. Why tell me to hurry up when you got me in late. It was not a good way of treating customers.

My flight time was changed without any notification to me which ruined my time sensitive plans so I ended up completely changing my travel plans and no reimbursement.

No screens or meal options. Freezing cold. Dirty seats. Left late.

I liked that my son and I were reseated next to each other (we had different bookings). I liked that it was a directg flight and mostly on time. I liked that you provided pillows and blankets. Flight attendants were generally courteous. The messaging through wifi did not work well. The food was not good. Seats are very narrow and I felt slightly claustraphobic in the window seat.

Some crew were unfriendly or in some cases just straight up rude.

Everything you need to know for your flight from Ontario to Otopeni Intl

Information on your arrival and departure airports