Find Cheap Flights from Montreal to Costa Mesa | Cheapflights

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Cheapflights Tip: The best prices from Montreal to Costa Mesa are usually found in January or March, booked 60 days in advance, depart on a Thursday or Friday and return on a Wednesday

Find flight deals from Montreal to Costa Mesa

Popular in	December
Cheapest in	January
Average price	C$ 700

Highest demand for flights based on searches. 4% potential increase in price (C$ 45 potential increase over avg. RT price).

Cheapest flight prices on average. 1% potential price decrease (C$ 20 potential savings vs. average RT price).

Average for round-trip flights in October 2026

Cheapflights Insights

Everything you need to know about your flight from Montreal to Costa Mesa

What is the cheapest time of day to fly from YMQ to CM3?

When flying from Montreal to Costa Mesa, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Costa Mesa

Get a feel of what it's like to fly with Porter Airlines,Delta, andUnited Airlines from Montreal to Costa Mesa by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Porter Airlines

8.0

Very good

Reviews

1 / 20

8.0

Excellent

D,Sep 2026

YHM - YVR

The flight including check-in, checked baggage, boarding, flight and timing were great. My checked bag was delayed two days which was concerning. They did deliver it to my door though which was great.

Porter Airlines

8.0

Very good

Porter Airlines

8.0

Very good

Reviews

1 / 20

8.0

Excellent

D,Sep 2026

YHM - YVR

The flight including check-in, checked baggage, boarding, flight and timing were great. My checked bag was delayed two days which was concerning. They did deliver it to my door though which was great.

7.8

Good

Porter Airlines

8.0

Very good

Reviews

1 / 20

8.0

Excellent

D,Sep 2026

YHM - YVR

The flight including check-in, checked baggage, boarding, flight and timing were great. My checked bag was delayed two days which was concerning. They did deliver it to my door though which was great.

United Airlines

7.3

Good

Porter Airlines

8.0

Very good

Reviews

1 / 20

8.0

Excellent

D,Sep 2026

YHM - YVR

The flight including check-in, checked baggage, boarding, flight and timing were great. My checked bag was delayed two days which was concerning. They did deliver it to my door though which was great.

7.2

Good

Porter Airlines

8.0

Very good

Reviews

1 / 20

8.0

Excellent

D,Sep 2026

YHM - YVR

The flight including check-in, checked baggage, boarding, flight and timing were great. My checked bag was delayed two days which was concerning. They did deliver it to my door though which was great.

7.1

Good

Porter Airlines

8.0

Very good

Reviews

1 / 20

8.0

Excellent

D,Sep 2026

YHM - YVR

The flight including check-in, checked baggage, boarding, flight and timing were great. My checked bag was delayed two days which was concerning. They did deliver it to my door though which was great.

Related info for your journey

What are the cheapest airlines to fly from Montreal to Costa Mesa one-way?
One-way options have recently been found by users for as low as C$ 225 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 250 and American Airlines from C$ 250 one-way.
What are the most reliable airlines from Montreal to Costa Mesa?
Before booking your flight to Costa Mesa from Montreal, check out the most reliable airlines to get you to your destination on time: Air Canada (67%), United Airlines (67%), Air New Zealand( 67%).
What are the cheapest flights from Montreal to Costa Mesa?
Looking for the cheapest flight from Montreal to Costa Mesa? While on average our users pay C$ 1,584, our data indicates the cheapest price to be C$ 348. The most popular route (Montreal Pierre Elliott Trudeau Intl - Los Angeles), is priced around C$ 491.
Can I find deals for flights from Montreal to Costa Mesa that include hotel bookings?
Yes. In addition to deals on Montreal to Costa Mesa flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Montreal to Costa Mesa?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Montreal to Costa Mesa.
Can I find deals for business class flights from Montreal to Costa Mesa?
Yes. Cheapflights offers flight deals from Montreal to Costa Mesa by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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Top 7 airlines flying from Montreal to Costa Mesa

Airline	Cheapest	Average	Flexibility	On-time
Delta	CheapestC$ 315	AverageC$ 607	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
Porter Airlines	CheapestC$ 323	AverageC$ 570	FlexibilityNo cancel fee	On-time52%	Search Porter Airlines flights
American Airlines	CheapestC$ 326	AverageC$ 681	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
WestJet	CheapestC$ 380	AverageC$ 488	FlexibilityNo cancel fee	On-time60%	Search WestJet flights
United Airlines	CheapestC$ 430	AverageC$ 735	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights
Air Canada	CheapestC$ 489	AverageC$ 907	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Air Transat	CheapestC$ 615	AverageC$ 643	FlexibilityNo cancel fee	On-time50%	Search Air Transat flights

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Why should you use Cheapflights to find cheap flight tickets from Montreal to Costa Mesa?

Millions of users choose and trust Cheapflights to book the best flight deals from Montreal to Costa Mesa for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Montreal to Costa Mesa with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Montreal to Costa Mesa, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Montreal to Costa Mesa become cheaper?

Not ready to book yet? You can track prices for flights from Montreal to Costa Mesa on Cheapflights with our Price Alert feature and get notified when better prices are available.

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