£170 Cheap Flights from Ottawa (YOW) to San Francisco (SFO)

View £170 flight on Wed, 19 Aug 2026Opens in a new window

Flight 1

Popular airlines from Ottawa International Airport (YOW) to San Francisco International Airport (SFO)

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Cheap Flights from Ottawa (YOW) to San Francisco (SFO)

Prices were available within the past 7 days and start at £170 for one-way flights and £300 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

WestJet
Wed, 19 Aug - Tue, 25 Aug
YOW
Ottawa
SFO
San Francisco
£300 Return, found 3 days ago
£300
Return
found 3 days ago
Select WestJet flight, departing Wed, 19 Aug from Ottawa to San Francisco, returning Tue, 25 Aug, priced at £300 found 3 days ago
WestJet
Tue, 25 Aug - Fri, 28 Aug
YOW
Ottawa
SFO
San Francisco
£302 Return, found 3 hours ago
£302
Return
found 3 hours ago
Select WestJet flight, departing Tue, 25 Aug from Ottawa to San Francisco, returning Fri, 28 Aug, priced at £302 found 3 hours ago
WestJet
Wed, 19 Aug - Tue, 25 Aug
YOW
Ottawa
SFO
San Francisco
£310 Return, found 3 days ago
£310
Return
found 3 days ago
Select WestJet flight, departing Wed, 19 Aug from Ottawa to San Francisco, returning Tue, 25 Aug, priced at £310 found 3 days ago
WestJet
Tue, 25 Aug - Fri, 28 Aug
YOW
Ottawa
SFO
San Francisco
£321 Return, found 3 hours ago
£321
Return
found 3 hours ago
Select WestJet flight, departing Tue, 25 Aug from Ottawa to San Francisco, returning Fri, 28 Aug, priced at £321 found 3 hours ago
WestJet
Wed, 19 Aug - Tue, 25 Aug
YOW
Ottawa
SFO
San Francisco
£322 Return, found 3 days ago
£322
Return
found 3 days ago
Select WestJet flight, departing Wed, 19 Aug from Ottawa to San Francisco, returning Tue, 25 Aug, priced at £322 found 3 days ago
WestJet
Tue, 25 Aug - Fri, 28 Aug
YOW
Ottawa
SFO
San Francisco
£324 Return, found 3 hours ago
£324
Return
found 3 hours ago
Select WestJet flight, departing Tue, 25 Aug from Ottawa to San Francisco, returning Fri, 28 Aug, priced at £324 found 3 hours ago
Air Canada
Wed, 19 Aug - Tue, 25 Aug
YOW
Ottawa
SFO
San Francisco
£339 Return, found 3 days ago
£339
Return
found 3 days ago
Select Air Canada flight, departing Wed, 19 Aug from Ottawa to San Francisco, returning Tue, 25 Aug, priced at £339 found 3 days ago
WestJet
Wed, 19 Aug - Tue, 25 Aug
YOW
Ottawa
SFO
San Francisco
£342 Return, found 3 days ago
£342
Return
found 3 days ago
Select WestJet flight, departing Wed, 19 Aug from Ottawa to San Francisco, returning Tue, 25 Aug, priced at £342 found 3 days ago
Air Canada
Tue, 25 Aug - Fri, 28 Aug
YOW
Ottawa
SFO
San Francisco
£342 Return, found 3 hours ago
£342
Return
found 3 hours ago
Select Air Canada flight, departing Tue, 25 Aug from Ottawa to San Francisco, returning Fri, 28 Aug, priced at £342 found 3 hours ago
Porter Airlines
Wed, 19 Aug - Tue, 25 Aug
YOW
Ottawa
SFO
San Francisco
£478 Return, found 3 days ago
£478
Return
found 3 days ago
Select Porter Airlines flight, departing Wed, 19 Aug from Ottawa to San Francisco, returning Tue, 25 Aug, priced at £478 found 3 days ago

Frequently asked questions

How much does a flight from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.) cost?
One-way flights typically cost between $825 and $3,063 and return flights often range between $1,459 and $4,982. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
November is typically the cheapest month to fly from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.), with average round-trip fares around 1099 CAD. This is about 21% lower than the average price throughout the year. November often sees lower prices as it's outside of peak holiday travel and summer vacation periods, leading to reduced demand. Other cheap months to fly from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.) include April and October.*Averages based on flights available on Expedia in the last year.
How do I find cheap flights from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
To find a cheap flight from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
Based on booking data from the past year, if you're looking for the best time to fly from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.), you'll find the cheapest fares in November and April, with average prices around 1099 CAD. While these months offer great value, the most popular times to travel, which means plenty of flight options, are February and October. Since there isn't a month that is both cheapest and most popular, you can choose between saving money in November or April, or having more flexibility with flight times in February or October.*Prices based on flights available on Expedia in the last year.
How many flights per day from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
There are approximately 39 connecting flights per day from Ottawa Macdonald-Cartier Intl. (YOW) to San Francisco Intl. (SFO). Some common connection points include Pearson Intl. (YYZ), O'Hare Intl. (ORD), and Washington Dulles Intl. (IAD).
What is the earliest flight from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
The earliest flight from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.) typically departs at approximately 5:00 AM local time. This flight is operated by Air Canada and is a seasonal service, active only in June. An early departure like this can help you maximize your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
You'll find the most flights from Ottawa Macdonald-Cartier Intl. (YOW) to San Francisco Intl. (SFO) on a Friday, with around 37 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Air Canada, United Airlines, and Porter Airlines. Flight options are fairly consistent throughout the week, with Fridays offering about 5% more flights than other days.
What are the most popular departure times for flights from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
The most popular departure times for flights from Ottawa Macdonald-Cartier Intl. (YOW) to San Francisco Intl. (SFO) are in the morning, from 6am to 9am. About 35% of passengers prefer this time window. Many major carriers, including United Airlines, Air Canada and Porter Airlines, offer flights during this window. This timing works well if you want to arrive in San Francisco early, giving you a full day to get settled or start exploring.
How long does it take to fly from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
Flights from YOW to SFO with one stop typically take around 8 hours 50 minutes, covering approximately 2,441 miles. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
Select the "Business class" and "First class" filters when looking for YOW to SFO flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.) flight with Expedia?
It's easy to earn miles on a Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for San Francisco from Macdonald-Cartier Intl. (YOW)?
From Macdonald-Cartier Intl. (YOW), you can fly into San Francisco Intl. (SFO) to reach San Francisco. Some flights may connect through major hubs like Pearson Intl. (YYZ), O'Hare Intl. (ORD), Washington Dulles Intl. (IAD) before reaching San Francisco. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.) at the last minute?
Typically, booking a last minute flight from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.) flight and hotel package?
Securing a Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.)?
If you booked your Ottawa, ON (YOW-Macdonald-Cartier Intl.) to San Francisco, CA (SFO-San Francisco Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Macdonald-Cartier Intl.
Destination airport
San Francisco Intl.
Airlines serving
Air Canada, Porter Airlines, WestJet
Return price
£299
Distance
3905 km

Book with confidence

Compare flights from Ottawa to San Francisco easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Ottawa to San Francisco. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to San Francisco Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Macdonald-Cartier Intl. to San Francisco Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Macdonald-Cartier Intl. (YOW) to San Francisco Intl. (SFO)

The easiest way to view the best deals on flights from Ottawa to San Francisco today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Macdonald-Cartier Intl. to San Francisco Intl. start at just £300 and range up to £478.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Ottawa and San Francisco
  • booking your flight during August, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Ottawa to San Francisco flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Macdonald-Cartier Intl. to San Francisco Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Ottawa to San Francisco easily and book with confidence

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*Available to Expedia members.