The cheapest times to fly from ONT to CLJ are

  • January 1st to March 11th
  • May 14th to July 8th
  • September 17th to September 30th
  • October 22nd to December 9th (except the week of November 19th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from ONT to CLJ is early to mid February. Prices can be as high as $8906 for Wednesday flights during mid December, or as low as $944 for Tuesday flights around early to mid February.


When to Fly to Cluj-Napoca

Flying from Ontario, CA (ONT) to Cluj-Napoca (CLJ) will usually cost between $965 to $1631 per person if booking more than four weeks in advance. On average the very cheapest time to fly is early to mid February with an average ticket price of $965. Due to high demand the most expensive time to fly is mid December, with an average price of $2511. Planning your trip to low-cost times can easily save you $1546 on economy flights and even more on first-class flights. Generally, any price below $1275 can be considered a good price for a round-trip ONT to CLJ flight.

See below for a graph of average weekly prices for the ONT to CLJ route. All prices are for round-trip tickets in USD.

ONT to CLJ Flight Prices

Compared to other flights, the ONT to CLJ flight is slightly more expensive than the average and costs about as much as the average flight leaving from Ontario. The average price per mile (for a direct flight) is $0.12, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Wednesdays are the most expensive days to fly to Cluj-Napoca, and Saturdays are the most expensive days to return to Ontario. Selecting flights on the least expensive days could save you up to $143 (11%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $1204. Return trip prices are from the CLJ to ONT flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from ONT to CLJ can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 12 hour 25 minutes may not be realistic.


Flight Hacking ONT to CLJ

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from ONT to CLJ — but Champion Traveler does!

Hack #1: Barcelona (ONT > BCN > CLJ)

  • Price for both tickets: $983
  • Average savings: $292 (22.9%)

See ONT to BCN flights

Hack #2: Dublin (ONT > DUB > CLJ)

  • Price for both tickets: $992
  • Average savings: $284 (22.24%)

See ONT to DUB flights

Hack #3: Chicago, IL (ONT > ORD > CLJ)

  • Price for both tickets: $1040
  • Average savings: $236 (18.47%)

See ONT to ORD flights


Flight Questions Answered

Still have questions about flying from ONT to CLJ? We’ve got answers.

Which airlines fly this route?

You can find 10 major airlines flying this route most often: Air France, American, British Airways, Delta, Finnair, Iberia, KLM, Lufthansa, Turkish Airlines, United, and potentially more during busy seasons.

How far away is it from Avram Iancu Airport to Ontario International Airport?

The distance between the two airports is roughly 6354 miles or 10226 kilometers.

How long does it take to fly from ONT to CLJ?

The real-world flight time for a nonstop ONT to CLJ flight is about 12 hour 25 minutes.

How many flights go between Ontario, CA and Cluj-Napoca?

It depends on the day of the week and the date, but a typical day might have around 11 available flights from ONT to CLJ.


Airport Location Info


Departing Airport

Origination code ONT
Origination airport name Ontario International Airport
City Ontario, CA
Country the United States
Latitude 34.1
Longitude -117.6

Return Airport

Destination code CLJ
Destination airport name Avram Iancu Airport
City Cluj-Napoca
Country Romania
Latitude 46.8
Longitude 23.7


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.