ONT - OTP

$471 Find Cheap Flights from Ontario to Bucharest - Compare and Save

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 9/1. 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
$721
United Airlines
Mon 7/27Fri 8/21
ONT - OTP • 2 stops
Cheapest one-way
$471
United Airlines
Tue 9/1
ONT - OTP • 2 stops
Top airlines
Cheapest • from $721 (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 - Fri, Aug 21
United Airlines Logo
6:10 am - 6:35 pm
ONT
-
OTP
26h 25m
2 stops
United Airlines Logo
6:05 am - 8:01 pm
OTP
-
ONT
23h 56m
3 stops
$721United Airlines
Mon, Jul 27 - Thu, Aug 20
United Airlines Logo
5:00 am - 1:10 am
ONT
-
OTP
34h 10m
2 stops
United Airlines Logo
12:45 pm - 8:01 pm
OTP
-
ONT
41h 16m
3 stops
$723United Airlines
Mon, Jul 27 - Tue, Aug 18
United Airlines Logo
1:50 pm - 1:10 am
ONT
-
OTP
25h 20m
2 stops
United Airlines Logo
12:45 pm - 8:53 pm
OTP
-
ONT
42h 08m
2 stops
$733United Airlines
Mon, Jul 27 - Tue, Aug 18
United Airlines Logo
1:18 pm - 6:35 pm
ONT
-
OTP
19h 17m
2 stops
United Airlines Logo
1:50 pm - 8:01 pm
OTP
-
ONT
40h 11m
2 stops
$741United Airlines
Mon, Jul 27 - Thu, Aug 13
United Airlines Logo
6:39 pm - 6:35 pm
ONT
-
OTP
37h 56m
2 stops
United Airlines Logo
6:05 am - 8:01 pm
OTP
-
ONT
23h 56m
3 stops
$752United Airlines
Tue, Oct 13 - Tue, Oct 27
Multiple Airlines Logo
10:25 am - 3:25 pm
ONT
-
OTP
19h 00m
2 stops
Multiple Airlines Logo
8:00 am - 9:08 pm
OTP
-
ONT
22h 08m
2 stops
$754Multiple Airlines
Mon, Jul 27 - Mon, Aug 17
United Airlines Logo
1:18 pm - 6:35 pm
ONT
-
OTP
19h 17m
2 stops
United Airlines Logo
12:45 pm - 8:53 pm
OTP
-
ONT
42h 08m
2 stops
$763United Airlines
Wed, Oct 14 - Wed, Oct 28
United Airlines Logo
11:10 am - 6:35 pm
ONT
-
OTP
21h 25m
2 stops
United Airlines Logo
7:10 pm - 10:26 pm
OTP
-
ONT
36h 16m
2 stops
$767United Airlines
Sun, Nov 1 - Sat, Nov 14
Delta Logo
9:55 am - 10:50 pm
ONT
-
OTP
26h 55m
2 stops
Delta Logo
6:00 am - 11:48 pm
OTP
-
ONT
27h 48m
2 stops
$769Delta
Mon, Jul 27 - Wed, Aug 12
United Airlines Logo
6:39 pm - 6:35 pm
ONT
-
OTP
37h 56m
2 stops
United Airlines Logo
1:45 pm - 8:01 pm
OTP
-
ONT
40h 16m
3 stops
$772United 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 5 days.

In the past 5 days, the cheapest round-trip tickets from Ontario to Bucharest were found on United Airlines ($721) and Delta ($769).

Good to know

Cheapest flight$471
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 5 days, the lowest price for a flight from Ontario to Bucharest Otopeni Intl Airport was $471 for a one-way ticket and $721 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 8405 reviews
7.2Food
8.5Crew
8.1Boarding
7.8Entertainment
7.8Comfort
Airline reviews

Be on time? When not on time a circling for over an hour offer more than 1 bag of chips to the passengers? It was a 7 hour flight by the time we got done.

4.0 OkayAndrew, Jun 2026
LAX - JFK
Read more Delta reviews

Be on time? When not on time a circling for over an hour offer more than 1 bag of chips to the passengers? It was a 7 hour flight by the time we got done.

Flight delayed four separate times. I’m now one hour hours late to landing.

Checkin was good, fllight ws good. Onlly complaint is lack of foot on 6 hour flight from Seattle to Boston. Snacks were flimsy - chips and cookies. could have offered something more substantial for such a long flight. I know you can buy food in airport but for the price you pay for a ticket, they should step up for the passengers.

Long story short, it was one of the better flight experiences I've had in some time when compared with other airlines.

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 was promised by United Airline (operated by ANA) that I will be seated together with my kids as I am the only adult flying with two minors. We did not get seats together in our 11 hours flight from LA to Tokyo. When asked at the gate, ANA representative said United Airline should have informed them that there is a parent flying with two minors. He said they can’t do anything in the system as the flight is full. He ask me to ask passengers next to me and the kids if they are willing to change seats. This is ridiculous! However, I went in the flight and asked other passages but no one willing to change seats. 11 hours and we were seating separately. I was very disappointed with this. It made things super inconvenient for me.

Service was professional and quick. Premium economy seat was comfortable given the class

It was perfect! United Airlines staff was extremely caring, super friendly and professional

The staff was extremely helpful and friendly at all times! They went above and beyond to get us into an earlier flight in San Diego to make our connection in SFO possible, because our original flight did actually not make it! I did so much appreciate the UA team and how they made this possible. We also didn’t have seats together on the long flight to Singapore, but they found us seats together last moment with no additional cost! Nobody sat next to us, so that we were able to sleep! Thanks to UA for improving their service and Underpricer for booking this trip! Please be careful: 1,5 hrs for transfer in San Francisco might not be enough time in the future

Over 2.5 hour maintenance delay on first morning flight with no acknowledgement, compensation or even gesture of good will. Aircraft had overnighted at airport so issue should have been addressed prior to boarding. Over 3.5 hours before first slow and deliberate beverage service.

United has maintenance issues and can then never recover. No operations ability and simple issues always turn into multiple hours long cascading delays. Worst airline on earth.

I paid for a confirmed upgraded aisle seat and was moved to a center seat in the back of the plane at the last minute.

Horrifying Almost 2 million miles. Bring your own food and drink. One coffee or drink every three hours. Have to order meals on app more than 24 hours ahead Tiny and dirty bathrooms

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.

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

Information on your arrival and departure airports