ONT - OTP

$344 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 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
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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
Sat 5/2Wed 5/13
ONT - OTP • 2 stops
Cheapest one-way
$344
Multiple Airlines
Tue 9/1
ONT - OTP • 2 stops
Top airlines
United Airlines
Cheapest • from $721 (round-trip)
United Airlines
Best reviews • 7.4 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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KAYAK searches 100s of sites at once to find you the best travel deals.
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

Sat, May 2 - Wed, May 13
United Airlines Logo
6:59 pm - 6:35 pm
ONT
-
OTP
37h 36m
2 stops
United Airlines Logo
6:05 am - 9:41 am
OTP
-
ONT
37h 36m
2 stops
$721United Airlines
Mon, May 4 - Tue, May 12
Delta Logo
11:53 am - 5:20 pm
ONT
-
OTP
19h 27m
2 stops
Delta Logo
7:05 am - 5:10 pm
OTP
-
ONT
20h 05m
2 stops
$723Delta
Sun, May 3 - Mon, May 11
Delta Logo
10:15 pm - 12:45 pm
ONT
-
OTP
52h 30m
2 stops
Delta Logo
2:00 pm - 5:10 pm
OTP
-
ONT
37h 10m
2 stops
$726Delta
Sat, May 2 - Mon, May 11
United Airlines Logo
6:59 pm - 6:35 pm
ONT
-
OTP
37h 36m
2 stops
United Airlines Logo
12:45 pm - 5:52 pm
OTP
-
ONT
39h 07m
2 stops
$733United Airlines
Sat, May 2 - Thu, May 14
United Airlines Logo
6:59 pm - 6:35 pm
ONT
-
OTP
37h 36m
2 stops
United Airlines Logo
1:45 pm - 10:59 pm
OTP
-
ONT
19h 14m
2 stops
$752United Airlines
Thu, Apr 30 - Wed, May 13
United Airlines Logo
1:40 pm - 1:10 am
ONT
-
OTP
25h 30m
2 stops
United Airlines Logo
6:05 am - 10:59 pm
OTP
-
ONT
26h 54m
2 stops
$771United Airlines
Thu, Apr 30 - Wed, May 13
Delta Logo
11:53 am - 5:20 pm
ONT
-
OTP
19h 27m
2 stops
Delta Logo
7:05 am - 5:10 pm
OTP
-
ONT
20h 05m
2 stops
$773Delta
Fri, May 1 - Wed, May 13
Delta Logo
12:49 pm - 12:45 pm
ONT
-
OTP
37h 56m
2 stops
Delta Logo
7:05 am - 6:36 pm
OTP
-
ONT
21h 31m
2 stops
$775Delta
Thu, Apr 30 - Mon, May 11
United Airlines Logo
1:40 pm - 1:10 am
ONT
-
OTP
25h 30m
2 stops
United Airlines Logo
12:45 pm - 5:52 pm
OTP
-
ONT
39h 07m
2 stops
$783United Airlines
Tue, Sep 29 - Tue, Oct 13
Turkish Airlines Logo
9:10 pm - 12:05 pm
ONT
-
OTP
28h 55m
2 stops
Turkish Airlines Logo
9:35 pm - 9:29 pm
OTP
-
ONT
33h 54m
2 stops
$791Turkish 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 72 hours.

In the past 3 days, the cheapest round-trip tickets from Ontario to Bucharest were found on United Airlines ($721) and Delta ($723).

Find deals

Good to know

Cheapest flight$344
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 3 days, the lowest price for a flight from Ontario to Bucharest Otopeni Intl Airport was $344 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?

    Star Alliance is the only airline alliance operating flights between Ontario and Bucharest.

  • 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 airline 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.
7.4
United AirlinesOverall score based on 9538 reviews
7.3Comfort
6.6Food
8.1Crew
7.7Boarding
7.1Entertainment
Airline reviews

It was perfect! I've never flown with United before, but I definitely will in the future

10.0 ExcellentAnonymous, Apr 2026
SFO - LAS
Read more United Airlines reviews

It was perfect! I've never flown with United before, but I definitely will in the future

I had a cancelled flight because of technical issues going to my destination, and a delayed flight coming home. All told it wasn’t a total bust.

The business class seat is exceptional. I wish the food is more palatable.

the entire flight felt off. The crew seemed uninterested and disengaged. The food service was really bad - overcooked, bland, weird food service. They actually woke us up to serve chicken wraps in the middle of the night, after dinner and before breakfast. Made no sense. Ultimately, I was glad they did though, because the breakfast had been held for so long it was inedible. Eggs, potatoes, sausage - all disgusting. We were asked to "honor" the lavatories for premium customers and stay in our own cabin: this was also strange. So people in economy didn't pay enough to use the closest toilet to them??? It's a toilet. All in all, not the experience I have come to expect from United Airlines. The return flight from Paris to SFO was better, btw.

They delayed the flight from 9:00 to 11:55 At 11:45 they canceled the flight. I paid a premium price for the tickets with poor service

My flight was canceled a few hours before boarding. I was rebooked on Copa airlines and missed an important meeting .

Business class seats felt very cramped compared to other airlines.

OK, we were delayed and had to de plane and reboard.

The 777’s economy seat’s legroom was more tolerable than expected. I appreciate the reclining mechanism which slides the seat forward to minimize cannibalizing the space behind. The food was terrible: very salty.

Seats are uncomfortable. This has been a trend in the industry for decades. Trying to fit more seats on each plane to increase profits at the expense of the passenger.

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

Information on your arrival and departure airports

Ontario (ONT)
Otopeni Intl (OTP)