In terms of precipitation, rainfall in Montreal Pierre Elliott Trudeau Intl Airport ranges from 64.0 - 111.0 mm per month. August is typically the wettest month, when rainfall can reach 111.0 mm. February is typically the driest time to visit Montreal Pierre Elliott Trudeau Intl Airport when rainfall is around 64.0 mm.

If weather is an important factor for your trip to Montreal Pierre Elliott Trudeau Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 22.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -9.0 C).

How can I find direct flights from Reagan-National to Pierre Elliott Trudeau Intl?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Reagan-National to Pierre Elliott Trudeau Intl.

Can I find deals for business class flights from Reagan-National to Pierre Elliott Trudeau Intl?

Yes. Cheapflights offers flight deals from Reagan-National to Pierre Elliott Trudeau Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

C$ 217+ Cheap Flights from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport

Q: Weekly flight availability from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport

The most flights from DCA to YUL are scheduled on a Monday (6 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).

Cheapflights Tip: The best prices from Washington, D.C. Reagan-National to Montreal Pierre Elliott Trudeau Intl are usually found in April or February, booked 86 days in advance, depart on a Tuesday or Sunday and return on a Friday

Cheap flight deals from Reagan-National to Pierre Elliott Trudeau Intl

Enter your travel dates to find the best prices.

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One-way

Cheapest flights from Reagan-National to Pierre Elliott Trudeau Intl
Explore the most affordable flight options available from Reagan-National to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 August 2026.

Wed 16/126:55 p.m. -

1 stop4h 30m

Thu 17/128:30 a.m. -

Nonstop1h 59m

Deal found 18/8C$ 461

Sat 3/106:00 a.m. -

Nonstop1h 48m

Sat 10/108:30 a.m. -

Nonstop1h 50m

Deal found 19/8C$ 487

Sat 5/94:20 p.m. -

Nonstop2h 00m

Sun 6/98:30 a.m. -

Nonstop1h 48m

Deal found 19/8C$ 491

Sun 4/109:40 a.m. -

Nonstop1h 48m

Sun 11/108:30 a.m. -

Nonstop1h 50m

Deal found 20/8C$ 494

Fri 23/104:20 p.m. -

Nonstop1h 53m

Mon 26/108:00 p.m. -

Nonstop1h 59m

Deal found 21/8C$ 495

Thu 15/1012:50 p.m. -

1 stop5h 48m

Mon 19/108:35 a.m. -

1 stop3h 34m

Deal found 20/8C$ 498

Sat 3/106:55 p.m. -

1 stop5h 30m

Sat 10/108:35 a.m. -

1 stop3h 34m

Deal found 19/8C$ 500

Fri 2/1012:40 p.m. -

1 stop5h 58m

Mon 5/108:30 a.m. -

Nonstop1h 50m

Deal found 18/8C$ 502

Sat 10/1012:50 p.m. -

1 stop5h 48m

Wed 14/108:35 a.m. -

1 stop3h 34m

Deal found 20/8C$ 504

Find flight deals from Reagan-National to Pierre Elliott Trudeau Intl

Round-trip from	C$ 461
One-way from	C$ 217
Popular in	July
Cheapest in	April
Average price	C$ 574
Good round-trip deal	C$ 1,054 or less

Air Canada
16/12-17/12
1 total stop
6h 29m total
Washington, D.C. to Montreal

Search Deals

Air Canada
31/8
Nonstop
1h 47m total
Washington, D.C. to Montreal

Search Deals

Highest demand for flights based on searches. 2% potential increase in price (C$ 20 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease (C$ 12 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 2026

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Price to beat on a round-trip flight from Washington, D.C. Reagan-National to Montreal Pierre Elliott Trudeau Intl.

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Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Montreal

DCA Washington, D.C. Reagan-National - YUL Montreal Pierre Elliott Trudeau Intl

DCAYUL

Washington, D.C. Reagan-National

Sat 3/10

10:40 a.m.-4:10 p.m.

1 stop5h 30m

Montreal Pierre Elliott Trudeau Intl

Tue 6/10

1:50 p.m.-3:40 p.m.

Nonstop1h 50m

C$ 589

Washington, D.C.Montreal

DCA Washington, D.C. Reagan-National - YUL Montreal Pierre Elliott Trudeau Intl

DCAYUL

Washington, D.C. Reagan-National

Fri 11/9

2:59 p.m.-10:06 p.m.

1 stop7h 07m

Montreal Pierre Elliott Trudeau Intl

Sun 13/9

8:30 a.m.-10:20 a.m.

Nonstop1h 50m

C$ 589

Washington, D.C.Montreal

DCA Washington, D.C. Reagan-National - YUL Montreal Pierre Elliott Trudeau Intl

DCAYUL

Washington, D.C. Reagan-National

Tue 8/9

2:59 p.m.-10:06 p.m.

1 stop7h 07m

Montreal Pierre Elliott Trudeau Intl

Thu 10/9

8:40 a.m.-12:14 p.m.

1 stop3h 34m

C$ 596

Washington, D.C.Montreal

DCA Washington, D.C. Reagan-National - YUL Montreal Pierre Elliott Trudeau Intl

DCAYUL

Washington, D.C. Reagan-National

Fri 30/10

5:35 p.m.-11:25 p.m.

1 stop5h 50m

Montreal Pierre Elliott Trudeau Intl

Mon 2/11

7:00 a.m.-5:26 p.m.

1 stop10h 26m

C$ 610

Washington, D.C.Montreal

DCA Washington, D.C. Reagan-National - YUL Montreal Pierre Elliott Trudeau Intl

DCAYUL

Washington, D.C. Reagan-National

Wed 11/11

6:30 p.m.-11:58 p.m.

1 stop5h 28m

Montreal Pierre Elliott Trudeau Intl

Sun 15/11

6:00 a.m.-11:31 a.m.

1 stop5h 31m

C$ 640

Washington, D.C.Montreal

DCA Washington, D.C. Reagan-National - YUL Montreal Pierre Elliott Trudeau Intl

DCAYUL

Washington, D.C. Reagan-National

Tue 20/10

4:20 p.m.-6:13 p.m.

Nonstop1h 53m

Montreal Pierre Elliott Trudeau Intl

Fri 23/10

8:00 p.m.-9:50 p.m.

Nonstop1h 50m

C$ 649

Quickest round-trip

Washington, D.C.Montreal

DCA Washington, D.C. Reagan-National - YUL Montreal Pierre Elliott Trudeau Intl

DCAYUL

Washington, D.C. Reagan-National

Thu 15/10

6:00 a.m.-7:48 a.m.

Nonstop1h 48m

Montreal Pierre Elliott Trudeau Intl

Sun 18/10

8:30 a.m.-10:20 a.m.

Nonstop1h 50m

C$ 649

Washington, D.C.Montreal

DCA Washington, D.C. Reagan-National - YUL Montreal Pierre Elliott Trudeau Intl

DCAYUL

Washington, D.C. Reagan-National

Mon 14/12

1:20 p.m.-6:54 p.m.

1 stop5h 34m

Montreal Pierre Elliott Trudeau Intl

Wed 16/12

6:00 a.m.-4:21 p.m.

2 stops10h 21m

C$ 695

Washington, D.C.Montreal

DCA Washington, D.C. Reagan-National - YUL Montreal Pierre Elliott Trudeau Intl

DCAYUL

Washington, D.C. Reagan-National

Thu 24/12

7:35 a.m.-2:00 p.m.

1 stop6h 25m

Montreal Pierre Elliott Trudeau Intl

Mon 28/12

12:10 p.m.-6:18 p.m.

1 stop6h 08m

C$ 717

Washington, D.C.Montreal

DCA Washington, D.C. Reagan-National - YUL Montreal Pierre Elliott Trudeau Intl

DCAYUL

Washington, D.C. Reagan-National

Fri 27/11

9:10 a.m.-9:42 p.m.

1 stop12h 32m

Montreal Pierre Elliott Trudeau Intl

Mon 30/11

4:10 p.m.-10:38 p.m.

1 stop6h 28m

C$ 717

Flights are sorted by cheapest round-trip flights first.

Deals found on 17/8

Showing 1-10 of 21 resultsSorted by cheapest first

Best time to book a flight from Reagan-National to Pierre Elliott Trudeau Intl

Have a flexible travel schedule? Discover the best time to fly to Pierre Elliott Trudeau Intl from Reagan-National with our price prediction graph.

DCA-YUL

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport

Prices

Airlines

How far ahead should I book a flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?

The price you pay for your flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 85 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?

Currently, April is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 487). Flying from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport in July is currently the most expensive (average of C$ 677). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from DCA to YUL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport as you normally would.

How much does it cost to fly round-trip from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?

Airfare is below average for this route at the moment.

Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport flights typically cost between C$ 473 and C$ 674 in December.
The cheapest round-trip price found within the last 5 days was C$ 461 on Air Canada (16 Dec-17 Dec).

Reviews of airlines servicing Pierre Elliott Trudeau Intl

Check out reviews from past customers who have flown with Air Canada from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Air Canada

7.1

Good

11,514 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,May 2026

YYJ - YUL

The pouch in front of my seat was never cleaned. The hospitality I requested wasn't there for me. Perhaps as looking at me you wouldn't think I needed it. I push myself then pay for it later. Like last night and today....... The flight had a generator problem, we had to debark the plane as there was no staff to repair it , therefore we had to wait for staff to come from Vancouver to repair it. The staff on hand though were very good at keeping us informed and making sure of any questions we had at that point. Once repaired all went well. Then just the hospitality wasn't there. When I did ask at the desk after the long walk from the plane the young person attending said baggage is just over there. Well just over there to a 30 year old and a 76 year old with mobility problems is quite different !

Air Canada

7.1

Good

11,514 reviews

Air Canada

7.1

Good

11,514 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,May 2026

YYJ - YUL

Related info for your journey

How long is the flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?
There are many flights that can get you from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport in 5h 50m. Fly via Delta to get the fastest option. The distance between Washington, D.C. Reagan-National Airport and Montreal Pierre Elliott Trudeau Intl Airport is about 782 km.
What is the cheapest airline to fly from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport round-trip?
According to our current data, Air Canada (C$ 452), offers the cheapest pricing from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport. Air Canada is currently priced 23% below the average price you’ll pay for this route.
What are the most reliable airlines from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?
No one likes to see their flight delayed. When booking a flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport consider choosing Air Canada (56%), Jazz (56%) or United Airlines (56%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?
Looking for the cheapest flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport? While on average our users pay C$ 1,157, our data indicates the cheapest price to be C$ 631. The most popular route (Washington, D.C. Reagan-National - Montreal Pierre Elliott Trudeau Intl), is priced around C$ 537.
Can I find deals for flights from Reagan-National to Pierre Elliott Trudeau Intl that include hotel bookings?
Yes. In addition to deals on Reagan-National to Pierre Elliott Trudeau Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Reagan-National to Pierre Elliott Trudeau Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Reagan-National to Pierre Elliott Trudeau Intl.
Can I find deals for business class flights from Reagan-National to Pierre Elliott Trudeau Intl?
Yes. Cheapflights offers flight deals from Reagan-National to Pierre Elliott Trudeau Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?
Currently, April is the cheapest month in which you can book a flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport (average of C$ 487). Flying from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport in July is currently the most expensive (average of C$ 677). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Magog

Montebello

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Drummondville

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Saint-Sauveur

Louiseville

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Baltimore to Pierre Elliott Trudeau Intl flights

Top airline flying from Reagan-National to Pierre Elliott Trudeau Intl

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	CheapestC$ 452	AverageC$ 571	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights

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How does Cheapflights help users find flights from Reagan-National to Pierre Elliott Trudeau Intl?

Deals for Reagan-National to Pierre Elliott Trudeau Intl flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Reagan-National to Pierre Elliott Trudeau Intl?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Pierre Elliott Trudeau Intl from Reagan-National.

Can Cheapflights find flights from Reagan-National to Pierre Elliott Trudeau Intl with no change fees?

Certainly. Search results for flights to Pierre Elliott Trudeau Intl from Reagan-National shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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Cheap flights from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport from C$ 217

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Reagan-National to Pierre Elliott Trudeau Intl

Cheapest flights from Reagan-National to Pierre Elliott Trudeau IntlExplore the most affordable flight options available from Reagan-National to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 August 2026.

Explore the most affordable flight options available from Reagan-National to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 August 2026.

Best flights from Reagan-National to Pierre Elliott Trudeau IntlDiscover carefully curated flight deals from Reagan-National to Pierre Elliott Trudeau Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 22 August 2026.

Discover carefully curated flight deals from Reagan-National to Pierre Elliott Trudeau Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 22 August 2026.

Direct flights from Reagan-National to Pierre Elliott Trudeau IntlExplore direct flight options from Reagan-National to Pierre Elliott Trudeau Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 22 August 2026.

Explore direct flight options from Reagan-National to Pierre Elliott Trudeau Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 22 August 2026.

Last-minute flights from Reagan-National to Pierre Elliott Trudeau IntlDiscover last-minute flight deals from Reagan-National to Pierre Elliott Trudeau Intl. Data last updated 22 August 2026 and is based on user searches.

Discover last-minute flight deals from Reagan-National to Pierre Elliott Trudeau Intl. Data last updated 22 August 2026 and is based on user searches.

One-way flights from Reagan-National to Pierre Elliott Trudeau IntlSearch for one-way flight options from Reagan-National to Pierre Elliott Trudeau Intl. Find affordable one-way fares based on user searches. Data last updated 22 August 2026.

Search for one-way flight options from Reagan-National to Pierre Elliott Trudeau Intl. Find affordable one-way fares based on user searches. Data last updated 22 August 2026.

Find flight deals from Reagan-National to Pierre Elliott Trudeau Intl

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Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport that are best for you.

Best time to book a flight from Reagan-National to Pierre Elliott Trudeau Intl

Have a flexible travel schedule? Discover the best time to fly to Pierre Elliott Trudeau Intl from Reagan-National with our price prediction graph.

Cheapflights Insights

How far ahead should I book a flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?

What is the cheapest month to book a flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?

What is the cheapest time of day to fly from DCA to YUL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport as you normally would.

How much does it cost to fly round-trip from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?

Airfare is below average for this route at the moment.

Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport flights typically cost between C$ 473 and C$ 674 in December.The cheapest round-trip price found within the last 5 days was C$ 461 on Air Canada (16 Dec-17 Dec).

Weekly flight availability from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport

The most flights from DCA to YUL are scheduled on a Monday (6 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).

Reviews of airlines servicing Pierre Elliott Trudeau Intl

Related info for your journey

How long is the flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?

What is the cheapest airline to fly from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport round-trip?

What are the most reliable airlines from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?

What are the cheapest flights from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?

Can I find deals for flights from Reagan-National to Pierre Elliott Trudeau Intl that include hotel bookings?

How can I find direct flights from Reagan-National to Pierre Elliott Trudeau Intl?

Can I find deals for business class flights from Reagan-National to Pierre Elliott Trudeau Intl?

What is the cheapest month to book a flight from Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport?

Travelling to a place near Montreal Pierre Elliott Trudeau Intl Airport?

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Alternative routes for Reagan-National to Pierre Elliott Trudeau Intl

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Complete your trip

Complete your trip to Pierre Elliott Trudeau Intl by adding a car rental and/or hotel reservation to your travel itinerary.

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Search flights from Reagan-National to Pierre Elliott Trudeau Intl by cabin class

Find flights from Reagan-National to Pierre Elliott Trudeau Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Reagan-National and Pierre Elliott Trudeau Intl flights

Browse other Reagan-National and Pierre Elliott Trudeau Intl flight options. Last updated on 22 August 2026.

Other flights from Reagan-National

Browse through other flights departing from Reagan-National. Flights are based on user searches made on Cheapflights and were last updated on 22 August 2026.

Other flights to Pierre Elliott Trudeau Intl

Explore flights to Pierre Elliott Trudeau Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 22 August 2026.

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Why should you use Cheapflights to find cheap flight tickets from Reagan-National to Pierre Elliott Trudeau Intl?

Can Cheapflights find flights from Reagan-National to Pierre Elliott Trudeau Intl with no change fees?

Can Cheapflights notify me if prices for flights from Reagan-National to Pierre Elliott Trudeau Intl become cheaper?

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Cheapest flights from Reagan-National to Pierre Elliott Trudeau Intl
Explore the most affordable flight options available from Reagan-National to Pierre Elliott Trudeau Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 22 August 2026.

Best flights from Reagan-National to Pierre Elliott Trudeau Intl
Discover carefully curated flight deals from Reagan-National to Pierre Elliott Trudeau Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 22 August 2026.

Direct flights from Reagan-National to Pierre Elliott Trudeau Intl
Explore direct flight options from Reagan-National to Pierre Elliott Trudeau Intl based on user searches, and compare prices and availability for your desired travel dates. Data last updated 22 August 2026.

Last-minute flights from Reagan-National to Pierre Elliott Trudeau Intl
Discover last-minute flight deals from Reagan-National to Pierre Elliott Trudeau Intl. Data last updated 22 August 2026 and is based on user searches.

One-way flights from Reagan-National to Pierre Elliott Trudeau Intl
Search for one-way flight options from Reagan-National to Pierre Elliott Trudeau Intl. Find affordable one-way fares based on user searches. Data last updated 22 August 2026.

Washington, D.C. Reagan-National Airport to Montreal Pierre Elliott Trudeau Intl Airport flights typically cost between C$ 473 and C$ 674 in December.
The cheapest round-trip price found within the last 5 days was C$ 461 on Air Canada (16 Dec-17 Dec).