Cheap Flights from Ontario International to Kathmandu

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Compare Ontario International to Kathmandu flight deals

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Flight deals from Ontario International to Kathmandu

Looking for a cheap last-minute deal or the best return flight from Ontario International Airport to Kathmandu Airport? If you want to travel next month, return fares start from $3,266. Find the lowest prices on one-way and return tickets right here.

Kathmandu.$2,468 per passenger.Departing Wed, 30 Sep, returning Wed, 14 Oct.Return flight with Alaska Airlines and Qatar Airways.Outbound indirect flight with Alaska Airlines, departs from Ontario International on Wed, 30 Sep, arriving in Kathmandu.Inbound indirect flight with Qatar Airways, departs from Kathmandu on Wed, 14 Oct, arriving in Ontario International.Price includes taxes and charges.From $2,468, select.

Kathmandu.$2,477 per passenger.Departing Mon, 26 Oct, returning Mon, 2 Nov.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Ontario International on Mon, 26 Oct, arriving in Kathmandu.Inbound indirect flight with Qatar Airways, departs from Kathmandu on Mon, 2 Nov, arriving in Ontario International.Price includes taxes and charges.From $2,477, select.

Kathmandu.$2,482 per passenger.Departing Sat, 1 May, returning Sat, 15 May.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Ontario International on Sat, 1 May, arriving in Kathmandu.Inbound indirect flight with Qatar Airways, departs from Kathmandu on Sat, 15 May, arriving in Ontario International.Price includes taxes and charges.From $2,482, select.

Kathmandu.$2,837 per passenger.Departing Tue, 13 Apr, returning Thu, 29 Apr.Return flight with China Airlines and Cathay Pacific.Outbound indirect flight with China Airlines, departs from Ontario International on Tue, 13 Apr, arriving in Kathmandu.Inbound indirect flight with Cathay Pacific, departs from Kathmandu on Thu, 29 Apr, arriving in Ontario International.Price includes taxes and charges.From $2,837, select.

Kathmandu.$2,874 per passenger.Departing Tue, 26 Jan, returning Tue, 2 Feb.Return flight with China Airlines and Cathay Pacific.Outbound indirect flight with China Airlines, departs from Ontario International on Tue, 26 Jan, arriving in Kathmandu.Inbound indirect flight with Cathay Pacific, departs from Kathmandu on Tue, 2 Feb, arriving in Ontario International.Price includes taxes and charges.From $2,874, select.

Kathmandu.$2,883 per passenger.Departing Sat, 28 Nov, returning Mon, 21 Dec.Return flight with China Airlines and Cathay Pacific.Outbound indirect flight with China Airlines, departs from Ontario International on Sat, 28 Nov, arriving in Kathmandu.Inbound indirect flight with Cathay Pacific, departs from Kathmandu on Mon, 21 Dec, arriving in Ontario International.Price includes taxes and charges.From $2,883, select.

Kathmandu.$2,923 per passenger.Departing Thu, 17 Sep, returning Fri, 25 Sep.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Ontario International on Thu, 17 Sep, arriving in Kathmandu.Inbound indirect flight with Qatar Airways, departs from Kathmandu on Fri, 25 Sep, arriving in Ontario International.Price includes taxes and charges.From $2,923, select.

Kathmandu.$2,963 per passenger.Departing Tue, 1 Dec, returning Tue, 19 Jan.Return flight with China Airlines and Thai Airways.Outbound indirect flight with China Airlines, departs from Ontario International on Tue, 1 Dec, arriving in Kathmandu.Inbound indirect flight with Thai Airways, departs from Kathmandu on Tue, 19 Jan, arriving in Ontario International.Price includes taxes and charges.From $2,963, select.

Kathmandu.$2,991 per passenger.Departing Fri, 26 Mar, returning Sat, 10 Apr.Return flight with China Airlines and Thai Airways.Outbound indirect flight with China Airlines, departs from Ontario International on Fri, 26 Mar, arriving in Kathmandu.Inbound indirect flight with Thai Airways, departs from Kathmandu on Sat, 10 Apr, arriving in Ontario International.Price includes taxes and charges.From $2,991, select.

Kathmandu.$3,037 per passenger.Departing Fri, 26 Feb, returning Sun, 7 Mar.Return flight with China Airlines and Thai Airways.Outbound indirect flight with China Airlines, departs from Ontario International on Fri, 26 Feb, arriving in Kathmandu.Inbound indirect flight with Thai Airways, departs from Kathmandu on Sun, 7 Mar, arriving in Ontario International.Price includes taxes and charges.From $3,037, select.

Kathmandu.$3,066 per passenger.Departing Tue, 6 Apr, returning Mon, 7 Jun.Return flight with China Airlines and Cathay Pacific.Outbound indirect flight with China Airlines, departs from Ontario International on Tue, 6 Apr, arriving in Kathmandu.Inbound indirect flight with Cathay Pacific, departs from Kathmandu on Mon, 7 Jun, arriving in Ontario International.Price includes taxes and charges.From $3,066, select.

Kathmandu.$3,108 per passenger.Departing Sat, 9 Jan, returning Fri, 9 Apr.Return flight with China Airlines and Thai Airways.Outbound indirect flight with China Airlines, departs from Ontario International on Sat, 9 Jan, arriving in Kathmandu.Inbound indirect flight with Thai Airways, departs from Kathmandu on Fri, 9 Apr, arriving in Ontario International.Price includes taxes and charges.From $3,108, select.

Kathmandu.$3,158 per passenger.Departing Fri, 19 Mar, returning Tue, 30 Mar.Return flight with China Airlines and Thai Airways.Outbound indirect flight with China Airlines, departs from Ontario International on Fri, 19 Mar, arriving in Kathmandu.Inbound indirect flight with Thai Airways, departs from Kathmandu on Tue, 30 Mar, arriving in Ontario International.Price includes taxes and charges.From $3,158, select.

Kathmandu.$3,185 per passenger.Departing Sun, 11 Apr, returning Sun, 2 May.Return flight with China Airlines and Cathay Pacific.Outbound indirect flight with China Airlines, departs from Ontario International on Sun, 11 Apr, arriving in Kathmandu.Inbound indirect flight with Cathay Pacific, departs from Kathmandu on Sun, 2 May, arriving in Ontario International.Price includes taxes and charges.From $3,185, select.

Kathmandu.$3,266 per passenger.Departing Thu, 1 Oct, returning Thu, 29 Oct.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Ontario International on Thu, 1 Oct, arriving in Kathmandu.Inbound indirect flight with Qatar Airways, departs from Kathmandu on Thu, 29 Oct, arriving in Ontario International.Price includes taxes and charges.From $3,266, select.

Kathmandu.$3,288 per passenger.Departing Sat, 5 Dec, returning Sun, 27 Dec.Return flight with China Airlines and Thai Airways.Outbound indirect flight with China Airlines, departs from Ontario International on Sat, 5 Dec, arriving in Kathmandu.Inbound indirect flight with Thai Airways, departs from Kathmandu on Sun, 27 Dec, arriving in Ontario International.Price includes taxes and charges.From $3,288, select.

Find the cheapest month to fly from Ontario International to Kathmandu

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Kathmandu flights are currently cheapest in May.

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Ontario International to Kathmandu: Alternative routes

Compare routes from Ontario International to Kathmandu below. You may find an airport to fly into that's cheaper, faster, or easier than Kathmandu.

Kathmandu

5km from central Kathmandu

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from $2,470

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Ontario to Kathmandu: Flight information

The things to know before you go.

Cheapest flight found	$2,468
Cheapest month to fly	September

Finding cheap flights from Ontario International to Kathmandu: Frequently asked questions

How much are return flights from Ontario International to Kathmandu?

The best price we found for a return flight from Ontario International to Kathmandu is $2,468. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

Which airlines fly direct from Ontario International to Kathmandu?

Currently, there are no airlines that fly direct from Ontario International to Kathmandu. But we found flights with one or more stops from $2,468.

How many flights are there a week from Ontario International to Kathmandu?

As of September 2026, there are no flights flying from Ontario International to Kathmandu.

When is the cheapest time to fly from Ontario International to Kathmandu?

The cheapest month to fly from Ontario International to Kathmandu is usually September.

Which upcoming date is cheapest to fly from Ontario International Airport to Kathmandu Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Kathmandu Airport on Wednesday, 30 September 2026.

Can I get a direct flight from Ontario International Airport to Kathmandu Airport?

No airlines currently offer direct flights between Ontario International Airport and Kathmandu Airport. Most routes have one or more stops.

How can I find the best flight deal to Kathmandu?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Kathmandu but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to Kathmandu?

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Kathmandu is around 40 days in advance, so don’t leave your flight to the last minute.

Which is the cheapest airline to fly from Ontario International Airport to Kathmandu with?

Currently, Alaska Airlines offers the cheapest flight tickets to Kathmandu.

Flying from Ontario International Airport (ONT) to Tribhuvan International Airport (KTM): what you need to know

Kathmandu's timezone is UTC+5:47, making Kathmandu 12 hours 48 minutes ahead of Ontario.
For a stress-free journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This ensures you have enough time to catch your ONT to KTM flight.
During popular months like August, it's a good idea to get to the airport even earlier. Arrive two hours before domestic departures and four hours ahead for an international flight whenever you're flying during a peak period in general.

How to find the cheapest flights from Ontario International Airport (ONT) to Tribhuvan International Airport (KTM)

$1,090 is the best price for a one-way Ontario International Airport to Tribhuvan International Airport flight. A return flight starts at $2,470. These fares may change based on availability.
Don't wait until the last moment. You're more likely to get cheap tickets from ONT to KTM if you book early. Airlines often have some terrific early bird discounts.
Getting cheap flights from Ontario International Airport to Tribhuvan International Airport is easy if you're flexible with your trip dates. Use the 'Whole month' function to see the best prices across the month and bag a great deal.
Landing cheap flights from ONT to KTM is a breeze with Price Alerts. All you need to do is create one of these automatic alerts and we'll notify you when fares go down.
Lock in the perfect flight for you with the help of the filters. To see the 'Fastest,' 'Cheapest' or 'Best' flights from Ontario International Airport to Tribhuvan International Airport, use the 'Sort by' tool. You can also filter results by departure and arrival times, airline, and number of stops.

Handy information about Ontario International Airport (ONT)

You'll find ONT at 2900 E. Airport Drive.
83.6% of flights departing from Ontario International Airport touch down at their destination on schedule. With its strong on-time performance, disruptions are unlikely when setting off from ONT.
To reach Ontario International Airport from central Ontario, it takes around 10 minutes if you're planning to drive. Of course, this depends on traffic. It's approximately 6 kilometres from the airport to the city centre.
Expect a trip time of roughly 1 hour 30 minutes on public transport.
Looking for a handy hotel close to ONT? If you're boarding an early flight from Ontario International Airport to Tribhuvan International Airport, these stays will have you sleeping moments from your departure lounge:

Arriving at Tribhuvan International Airport (KTM)

If you have a late Ontario International Airport to Tribhuvan International Airport flight, nothing tops the convenience of staying near the terminal. Collect your bags from the carousel and then be showered and resting not long after at one of these options near KTM:
Venture beyond Kathmandu and explore places that usually fly under the radar with your own wheels. You can grab a Tribhuvan International Airport rental car from Spark Car.
Lock in the best deal by booking your ride from Tribhuvan International Airport around one week before your departure date.

Getting from Tribhuvan International Airport (KTM) to central Kathmandu

From Tribhuvan International Airport, Kathmandu is approximately 5 kilometres away. It takes around 15 minutes to reach the centre driving.

When to fly to Tribhuvan International Airport (KTM)

It's time to choose your dates for your flight from Ontario International Airport to Tribhuvan International Airport. September is the most popular month to visit Kathmandu. If you want a more low-key vibe, go in February.
When reserving your flight from Ontario International Airport to Tribhuvan International Airport, think about the type of weather you enjoy. June is the warmest month in Kathmandu, with temperatures ranging from 17ºC to 28ºC.
Look for cheap tickets from ONT to KTM in January if you like cooler conditions. Temperatures are at their lowest around then, ranging between 3ºC and 18ºC on average.

Explore more of Nepal

Pokhara is just one of the many places in Nepal waiting to be discovered once you've seen the sights of Kathmandu. Around 145 kilometres away to the north-west, its best attractions include Phewa Lake, Sarangkot and Gupteshwor Mahadev Cave.
If you want to check out another major destination in Nepal, consider Patan, roughly 6 kilometres south of Kathmandu. Aspur Agro Farm, Pimbahaa Pukhoo and Rajib Handicraft are key reasons to visit.