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Cheap flights from Montreal to San Francisco from C$ 256

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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — SFO
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Montreal to San Francisco are usually found in May or February, booked 89 days in advance, depart on a Friday or Thursday and return on a Friday

Cheap flight deals from Montreal to San Francisco

Discover tips and strategies to find the most affordable flight options for your journey from Montreal (YMQ) to San Francisco (SFO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 11 September 2025.

Round-trip from

C$ 431

One-way from

C$ 256

Popular in

December

Cheapest in

May

Average price

C$ 517

Good round-trip deal

C$ 721 or less

Good one-way deal

C$ 696 or less
WestJet
  • WestJet
  • 1/10-6/10
  • 2 total stops
  • 26h 15m total
  • Montreal to San Francisco
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6/10
  • 6/10
  • 3 total stops
  • 54h 55m total
  • Montreal to San Francisco
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Highest demand for flights based on searches. 7% potential increase in price (C$ 64 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 25 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Montreal (YMQ) to San Francisco.
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Price to beat on a one-way flight from Montreal (YMQ) to San Francisco.
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Find flight deals from Montreal to San Francisco

Cheapest flights from Montreal to San Francisco
Explore the most affordable flight options available from Montreal to San Francisco. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 September 2025.

Wed 1/107:00 a.m.YUL - SFO
1 stop17h 24mWestJet
Mon 6/1012:50 p.m.SFO - YUL
1 stop8h 51mWestJet
Deal found 10/9C$ 431
Thu 2/105:30 p.m.YUL - SFO
1 stop30h 54mWestJet
Sat 11/107:30 a.m.SFO - YUL
2 stops13h 57mWestJet
Deal found 9/9C$ 432
Wed 1/106:45 a.m.YUL - SFO
1 stop8h 38mMultiple Airlines
Tue 7/1012:50 p.m.SFO - YUL
1 stop8h 51mMultiple Airlines
Deal found 9/9C$ 434
Tue 16/95:30 p.m.YUL - SFO
1 stop21h 24mWestJet
Tue 23/97:30 a.m.SFO - YUL
2 stops13h 57mWestJet
Deal found 9/9C$ 435
Wed 1/106:45 a.m.YUL - SFO
2 stops17h 39mWestJet
Wed 8/107:30 a.m.SFO - YUL
2 stops13h 57mWestJet
Deal found 9/9C$ 438
Wed 17/97:00 a.m.YUL - SFO
1 stop17h 24mWestJet
Tue 23/97:30 a.m.SFO - YUL
2 stops13h 57mWestJet
Deal found 9/9C$ 439
Thu 25/98:05 a.m.YUL - SFO
Nonstop6h 06mAir Canada
Mon 29/911:40 a.m.SFO - YUL
Nonstop5h 25mAir Canada
Deal found 8/9C$ 441
Wed 1/101:10 p.m.YUL - SFO
3 stops23h 20mMultiple Airlines
Sun 12/1010:15 a.m.SFO - YUL
1 stop17h 52mMultiple Airlines
Deal found 10/9C$ 442
Wed 8/106:45 a.m.YUL - SFO
2 stops17h 39mWestJet
Mon 20/107:30 a.m.SFO - YUL
2 stops13h 57mWestJet
Deal found 9/9C$ 443
Sat 4/106:45 a.m.YUL - SFO
1 stop8h 38mPorter Airlines
Sun 26/101:40 p.m.SFO - YUL
1 stop7h 55mPorter Airlines
Deal found 9/9C$ 445
Thu 2/108:05 a.m.YUL - SFO
Nonstop6h 06mAir Canada
Sat 11/102:05 p.m.SFO - YUL
1 stop7h 35mAir Canada
Deal found 9/9C$ 446

Cheapflights Fare Finder

 
Customize your flight search to find flights from Montreal to San Francisco that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 11 September 2025.
Use the filters below to find and compare flights from Montreal to San Francisco that are best for you.

Fly from

Montreal

Fly to

San Francisco

Route

Depart

Return

Price

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Fri 26/9

5:30 p.m.-9:24 p.m.

1 stop30h 54m

San Francisco

Tue 30/9

7:30 a.m.-12:27 a.m.

2 stops13h 57m

C$ 441

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Tue 7/10

6:30 p.m.-9:40 p.m.

Nonstop6h 10m

San Francisco

Tue 14/10

11:00 p.m.-10:40 a.m.

1 stop8h 40m

C$ 463

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Wed 8/10

6:30 p.m.-9:40 p.m.

Nonstop6h 10m

San Francisco

Sun 19/10

8:30 a.m.-5:00 p.m.

Nonstop5h 30m

C$ 463

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Mon 6/10

6:30 p.m.-9:40 p.m.

Nonstop6h 10m

San Francisco

Mon 6/10

11:56 p.m.-3:00 p.m.

1 stop12h 04m

C$ 463

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Thu 2/10

6:30 p.m.-9:40 p.m.

Nonstop6h 10m

San Francisco

Sat 11/10

11:45 p.m.-8:16 a.m.

Nonstop5h 31m

C$ 463

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Sun 23/11

6:45 a.m.-12:40 p.m.

1 stop8h 55m

San Francisco

Tue 2/12

10:15 a.m.-7:05 a.m.

2 stops17h 50m

C$ 464

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Thu 2/10

9:45 a.m.-11:59 p.m.

1 stop17h 14m

San Francisco

Sat 11/10

11:40 a.m.-8:05 p.m.

Nonstop5h 25m

C$ 471

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Wed 8/10

9:45 a.m.-3:30 p.m.

1 stop8h 45m

San Francisco

Sun 19/10

11:45 p.m.-8:16 a.m.

Nonstop5h 31m

C$ 471

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Wed 1/10

4:55 p.m.-10:31 p.m.

1 stop8h 36m

San Francisco

Fri 10/10

11:45 p.m.-8:16 a.m.

Nonstop5h 31m

C$ 478

MontrealSan Francisco

YUL - SFO

YULSFO

Montreal Pierre Elliott Trudeau Intl

Tue 25/11

6:45 a.m.-12:40 p.m.

1 stop8h 55m

C$ 258

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/9

Showing 1-10 of 21 results
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2
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Best time to book a flight from Montreal to San Francisco

Have a flexible travel schedule? Discover the best time to fly to San Francisco from Montreal with our price prediction graph.
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 Montreal to San Francisco

How far ahead should I book a flight from Montreal to San Francisco?

Use this chart to determine the optimal time to book a round-trip flight from Montreal to San Francisco. Price data was last updated on 29 August 2025.

To ensure you get the cheapest price possible for a flight from Montreal to San Francisco, you should look to book at least 89 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Montreal to San Francisco?

Currently, January is the cheapest month in which you can book a flight from Montreal to San Francisco (average of C$ 276). Flying from Montreal to San Francisco in December is currently the most expensive (average of C$ 368). 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 YMQ to SFO?

Find hourly flight availability from Montreal to San Francisco. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 September 2025.

A simple way to save on the total cost of your ticket is to fly from Montreal to San Francisco in the evening. If you’re flexible enough to do this you can expect to save up to 66% on your trip compared to booking a flight in the afternoon.

What is the cheapest day to fly from Montreal to San Francisco?

Use this chart to determine the cheapest time to fly round-trip from Montreal to San Francisco. Price data was last updated on 7 September 2025.

Travelers seeking maximum savings on their Montreal to San Francisco flight should consider departing on Friday evenings when fares are most often at their lowest. Monday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Montreal to San Francisco

Explore weekly flight availability from Montreal to San Francisco. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 11 September 2025.

The most flights from YMQ to SFO are scheduled on a Monday (9 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (9 on average).

How much does it cost to fly round-trip from Montreal to San Francisco?

What’s the top layover airport for flights from Montreal to San Francisco?

Share of one-stop round-trip flights from Montreal to San Francisco chosen by Cheapflights users in the past 12 months, using the same layover each way.

Toronto (YYZ) – chosen by Cheapflights users on 95% of one-stop itineraries from Montreal to San Francisco on Cheapflights.

What’s the cheapest layover airport for flights from Montreal to San Francisco?

Average round-trip fare for 1-stop flights from Montreal to San Francisco, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Toronto (YYZ) is the most affordable 1-stop option, with an average round-trip price of C$ 501.

What’s the fastest layover option from Montreal to San Francisco?

Shortest average travel time for 1-stop one-way flights from Montreal to San Francisco, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Chicago (ORD) have the shortest average one-way travel time for 1-stop routes: 8h 39m.

Which airport typically offers the quickest layover for flights from Montreal to San Francisco?

Average layover duration for 1-stop one-way flights from Montreal to San Francisco, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Chicago (ORD) offer the fastest connection on this route, with an average layover time of 1h 19m.

Reviews of airlines servicing San Francisco

Get insights into the airlines that provide service to San Francisco. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to San Francisco. Reviews last updated 11 September 2025.
Read through reviews of airlines operating flights from Montreal to San Francisco, such as Porter Airlines,United Airlines, andWestJet. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
7.9
Good
363 reviews
Check prices

Comfort

7.9

Entertainment

7.0

Overall

7.9

Food

7.6

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
7.9
Good
363 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Comfort

7.9

Entertainment

7.0

Overall

7.9

Food

7.6

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,937 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Comfort

7.9

Entertainment

7.0

Overall

7.9

Food

7.6

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
WestJet
7.2
Good
3,091 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Comfort

7.9

Entertainment

7.0

Overall

7.9

Food

7.6

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,000 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Comfort

7.9

Entertainment

7.0

Overall

7.9

Food

7.6

Crew

8.6

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

Related info for your journey

Find useful and relevant information for your journey from Montreal to San Francisco. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to San Francisco from Montreal?

    Most people fly into San Francisco (SFO) if they book a flight to San Francisco from Montreal. On average, San Francisco has 9 inbound flights from Montreal per day from 5 airlines. San Francisco is conveniently located just 19.0 km from San Francisco’s city centre.

  • How long is the flight from Montreal to San Francisco?

    Airlines like WestJet and United Airlines fly from Montreal to San Francisco in about 6h 10m. The time it takes to get you to your destination can typically vary by up to 24h 44m. Montreal and San Francisco are separated by a distance of 4073 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines flying from Montreal to San Francisco round-trip?

    According to our current data, American Airlines (C$ 240), Porter Airlines (C$ 303), and WestJet (C$ 333) offers the cheapest pricing from Montreal to San Francisco. You may be able to fly from Montreal to San Francisco for 58% less than the average price by searching for these airlines.

  • What are the most reliable airlines from Montreal to San Francisco?

    No one likes to see their flight delayed. When booking a flight from Montreal to San Francisco consider choosing Air New Zealand (62%), Brussels Airlines (60%) 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 Montreal to San Francisco?

    While on average a flight from Montreal to San Francisco is generally C$ 1,299, our data shows the cheapest flight currently is C$ 290. When looking at the most popular route, (Montreal Pierre Elliott Trudeau Intl - San Francisco), you can expect to pay C$ 396 for that flight.

  • Can I find deals for flights from Montreal to San Francisco that include hotel bookings?

    Yes. In addition to deals on Montreal to San Francisco flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Montreal to San Francisco?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Montreal to San Francisco.

  • Can I find deals for business class flights from Montreal to San Francisco?

    Yes. Cheapflights offers flight deals from Montreal to San Francisco 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 Montreal to San Francisco?

    Currently, January is the cheapest month in which you can book a flight from Montreal to San Francisco (average of C$ 276). Flying from Montreal to San Francisco in December is currently the most expensive (average of C$ 368). 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

Travelling to a place near San Francisco?

Book flights to San Francisco if you plan to visit one of these locations
Richmond
Newark
Alameda
Redwood City
Burlingame
San Bruno
South San Francisco
Scotts Valley
Belmont
Novato
Millbrae
Santa Clara
Vallejo

Browse thousands of different options on Cheapflights for your next trip

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Fly from Montreal to San Francisco on these airlines

Choose from the following airlines for your flight from Montreal to San Francisco. Flights are based on user searches made on Cheapflights and were last updated on 11 September 2025.
Air Canada flights from Montreal to San Francisco
United Airlines flights from Montreal to San Francisco

Top 5 airlines flying from Montreal to San Francisco

Discover the top 5 airlines that operate flights from Montreal to San Francisco. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapestC$ 240AverageC$ 615FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Porter AirlinesCheapestC$ 303AverageC$ 398FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
WestJetCheapestC$ 333AverageC$ 396FlexibilityNo cancel feeOn-time60%
Search WestJet flights
United AirlinesCheapestC$ 437AverageC$ 642FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 457AverageC$ 650FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Montreal to San Francisco?

Deals for Montreal to San Francisco 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 Montreal to San Francisco?

Millions of users choose and trust Cheapflights to book the best flight deals from Montreal to San Francisco 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 San Francisco with no change fees?

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

Can Cheapflights notify me if prices for flights from Montreal to San Francisco become cheaper?

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

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