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Cheap flights from Ottawa to Porto from C$ 473

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 26/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
YOW — OPO
2 Apr — 9 Apr1
1 adult
Tue 2/4
Tue 9/4

Find deals on flights from Ottawa to Porto by searching across hundreds of travel sites at once

 
Cheapflights users frequently choose these airlines when searching for flights from Ottawa to Porto, based on our search results.
Cheapflights users frequently choose these airlines when searching for flights from Ottawa to Porto, based on our search results.
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Cheap flight deals from Ottawa to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to Porto (OPO). 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 28 March 2024.

Popular in

July

Cheapest in

January

Round-trip from

C$ 698

One-way from

C$ 651
High demand for flights, 26% potential price rise
Best time to find cheap flights, 23% potential price drop
From Ottawa to Porto
One-way flight from Ottawa to Porto

What is the cheapest day to fly round-trip from Ottawa to Porto?

Leaving on a Wednesday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 38% on the overall cost on flights from Ottawa to Porto.

What is the cheapest month to fly from Ottawa to Porto?

The best pricing can be found in the month of January. Prices to Porto from Ottawa average C$ 1,306. You can even find prices in January for less than C$ 1,306, as users have found deals to Porto from as low as C$ 817. The month of July appears to be one of the more expensive times to travel to Porto from Ottawa. Flying in the targeted month can save you up to 34%.

When is the cheapest time to fly from Ottawa to Porto (YOW - OPO)?

One of the essential ways to save on airfare from Ottawa to Porto is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 25% on airfare.

Cheap SWISS flights from Ottawa to Porto

Explore cheap flight options specifically provided by SWISS for the route between Ottawa and Porto. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 586,909 searches. Data last updated 28 March 2024.
Consider these cheap SWISS flights we've found departing from Ottawa to Porto. Be sure to come back soon if the deals available don't appeal to you at this time.
Mon 15/412:30 p.m.YOW - OPO
2 stops17h 50mSWISS
Mon 22/47:15 p.m.OPO - YOW
2 stops29h 02mSWISS
Deal found 27/3C$ 1,035
Tue 14/58:10 a.m.YOW - OPO
2 stops24h 35mSWISS
Thu 23/52:35 p.m.OPO - YOW
2 stops32h 05mSWISS
Deal found 26/3C$ 1,220
Thu 9/511:00 a.m.YOW - OPO
2 stops21h 45mSWISS
Thu 23/52:35 p.m.OPO - YOW
2 stops33h 27mSWISS
Deal found 26/3C$ 1,275
Fri 10/58:10 a.m.YOW - OPO
2 stops22h 10mSWISS
Thu 23/52:35 p.m.OPO - YOW
2 stops33h 27mSWISS
Deal found 26/3C$ 1,332
Mon 13/58:10 a.m.YOW - OPO
2 stops22h 10mSWISS
Thu 23/52:35 p.m.OPO - YOW
2 stops32h 05mSWISS
Deal found 26/3C$ 1,347
Sun 12/58:10 a.m.YOW - OPO
2 stops24h 35mSWISS
Thu 23/52:35 p.m.OPO - YOW
2 stops33h 27mSWISS
Deal found 26/3C$ 1,360
Tue 14/58:10 a.m.YOW - OPO
2 stops24h 35mSWISS
Tue 28/52:35 p.m.OPO - YOW
2 stops32h 05mSWISS
Deal found 26/3C$ 1,375
Sat 11/58:10 a.m.YOW - OPO
2 stops22h 20mSWISS
Thu 23/52:35 p.m.OPO - YOW
2 stops32h 05mSWISS
Deal found 26/3C$ 1,401
Thu 9/511:00 a.m.YOW - OPO
2 stops21h 45mSWISS
Tue 28/52:35 p.m.OPO - YOW
2 stops32h 05mSWISS
Deal found 26/3C$ 1,431

Cheap Air Transat flights from Ottawa to Porto

Explore cheap flight options specifically provided by Air Transat for the route between Ottawa and Porto. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 586,909 searches. Data last updated 28 March 2024.
Browse through some of the cheapest Air Transat flights travelling from Ottawa to Porto. If these deals don't fit your criteria, make sure to check back soon as new deals are always added.
Thu 23/511:55 a.m.YOW - OPO
2 stops14h 05mAir Transat
Thu 20/61:30 p.m.OPO - YOW
1 stop26h 32mAir Transat
Deal found 27/3C$ 940
Wed 15/57:50 a.m.YOW - OPO
1 stop22h 55mAir Transat
Thu 23/51:30 p.m.OPO - YOW
1 stop15h 58mAir Transat
Deal found 26/3C$ 957
Fri 17/57:50 a.m.YOW - OPO
1 stop22h 55mAir Transat
Sat 1/61:30 p.m.OPO - YOW
1 stop26h 32mAir Transat
Deal found 28/3C$ 978
Sun 12/57:50 p.m.YOW - OPO
1 stop10h 55mAir Transat
Thu 23/51:30 p.m.OPO - YOW
1 stop23h 48mAir Transat
Deal found 26/3C$ 1,067
Fri 17/511:55 a.m.YOW - OPO
2 stops38h 05mAir Transat
Sat 1/61:30 p.m.OPO - YOW
1 stop15h 57mAir Transat
Deal found 28/3C$ 1,090
Sun 16/611:55 a.m.YOW - OPO
1 stop18h 50mAir Transat
Mon 15/71:30 p.m.OPO - YOW
1 stop23h 32mAir Transat
Deal found 27/3C$ 1,129
Fri 10/57:50 a.m.YOW - OPO
1 stop22h 55mAir Transat
Thu 23/51:30 p.m.OPO - YOW
1 stop31h 48mAir Transat
Deal found 26/3C$ 1,182
Wed 15/57:50 a.m.YOW - OPO
1 stop22h 55mAir Transat
Sat 25/51:30 p.m.OPO - YOW
1 stop31h 48mAir Transat
Deal found 26/3C$ 1,232
Wed 19/611:55 a.m.YOW - OPO
1 stop18h 50mAir Transat
Tue 9/78:40 a.m.OPO - YOW
2 stops28h 22mAir Transat
Deal found 28/3C$ 1,260

Cheap Ottawa to Porto flights in March & April 2024

Find cheap flight options from Ottawa to Porto specifically for the months of March and April 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 586,909 searches. Prices were last updated on 28 March 2024.
Check out some of the best flight deals from Ottawa to Porto in 2024. Check back in a little while for more flight options.
Mon 15/412:30 p.m.YOW - OPO
2 stops17h 50mSWISS
Mon 22/47:15 p.m.OPO - YOW
2 stops29h 02mSWISS
Deal found 27/3C$ 1,035
Mon 15/45:55 p.m.YOW - OPO
1 stop10h 50mMultiple Airlines
Mon 22/47:15 p.m.OPO - YOW
2 stops29h 02mMultiple Airlines
Deal found 27/3C$ 1,079
Fri 26/46:00 a.m.YOW - OPO
2 stops24h 40mMultiple Airlines
Fri 3/58:45 a.m.OPO - YOW
2 stops20h 43mMultiple Airlines
Deal found 27/3C$ 1,310
Mon 15/45:55 p.m.YOW - OPO
1 stop10h 50mAir Canada
Mon 22/412:35 p.m.OPO - YOW
1 stop25h 55mAir Canada
Deal found 27/3C$ 1,393
Fri 26/47:55 p.m.YOW - OPO
2 stops32h 50mAir Canada
Fri 3/56:00 a.m.OPO - YOW
2 stops32h 40mAir Canada
Deal found 27/3C$ 1,409
Fri 26/43:40 p.m.YOW - OPO
2 stops15h 00mMultiple Airlines
Fri 3/512:35 p.m.OPO - YOW
1 stop16h 53mMultiple Airlines
Deal found 27/3C$ 1,659
Fri 26/46:00 a.m.YOW - OPO
1 stop22h 45mAir Canada
Fri 3/56:00 a.m.OPO - YOW
2 stops32h 40mAir Canada
Deal found 27/3C$ 1,830
Fri 26/45:55 p.m.YOW - OPO
1 stop10h 50mAir Canada
Fri 3/512:35 p.m.OPO - YOW
1 stop14h 24mAir Canada
Deal found 27/3C$ 2,165

Ottawa to Porto 2024 flight deals

Discover exclusive flight deals for travel between Ottawa and Porto in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 586,909 searches. Data last updated 28 March 2024.
Check out some of the best flight deals from Ottawa to Porto in 2024. Check back in a little while for more flight options.
Thu 23/511:55 a.m.YOW - OPO
2 stops14h 05mAir Transat
Thu 20/61:30 p.m.OPO - YOW
1 stop26h 32mAir Transat
Deal found 27/3C$ 940
Wed 15/57:50 a.m.YOW - OPO
1 stop22h 55mAir Transat
Thu 23/51:30 p.m.OPO - YOW
1 stop15h 58mAir Transat
Deal found 26/3C$ 957
Fri 17/57:50 a.m.YOW - OPO
1 stop22h 55mAir Transat
Sat 1/61:30 p.m.OPO - YOW
1 stop26h 32mAir Transat
Deal found 28/3C$ 978
Mon 13/58:50 a.m.YOW - OPO
2 stops31h 25mMultiple Airlines
Thu 23/51:30 p.m.OPO - YOW
1 stop15h 58mMultiple Airlines
Deal found 26/3C$ 1,016
Thu 28/1110:30 a.m.YOW - OPO
2 stops20h 20mSWISS
Mon 2/1212:45 p.m.OPO - YOW
2 stops35h 19mSWISS
Deal found 27/3C$ 1,027
Thu 28/1110:30 a.m.YOW - OPO
2 stops20h 20mSWISS
Mon 2/1212:45 p.m.OPO - YOW
2 stops35h 19mSWISS
Deal found 26/3C$ 1,029
Mon 15/412:30 p.m.YOW - OPO
2 stops17h 50mSWISS
Mon 22/47:15 p.m.OPO - YOW
2 stops29h 02mSWISS
Deal found 27/3C$ 1,035
Sun 12/57:50 p.m.YOW - OPO
1 stop10h 55mAir Transat
Thu 23/51:30 p.m.OPO - YOW
1 stop23h 48mAir Transat
Deal found 26/3C$ 1,067
Mon 15/45:55 p.m.YOW - OPO
1 stop10h 50mMultiple Airlines
Mon 22/47:15 p.m.OPO - YOW
2 stops29h 02mMultiple Airlines
Deal found 27/3C$ 1,079

One-way flights to Porto from Ottawa

Search for one-way flight options from Ottawa to Porto. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 586,909 searches. Data last updated 28 March 2024.
Users travelling one-way from Ottawa to Porto can select one of these great deals. Those seeking round-trip flights from Ottawa to Porto should utilize the search form at the top of the page.
Fri 26/44:10 p.m.YOW - OPO
3 stops58h 50mMultiple Airlines
Deal found 27/3C$ 473
Fri 26/44:10 p.m.YOW - OPO
2 stops35h 30mMultiple Airlines
Deal found 27/3C$ 505
Thu 13/68:05 a.m.YOW - OPO
2 stops25h 40mMultiple Airlines
Deal found 27/3C$ 565
Thu 13/611:55 a.m.YOW - OPO
1 stop30h 15mMultiple Airlines
Deal found 28/3C$ 591
Thu 13/611:55 a.m.YOW - OPO
1 stop30h 15mMultiple Airlines
Deal found 27/3C$ 592
Mon 2/98:05 a.m.YOW - OPO
1 stop22h 40mAir Transat
Deal found 26/3C$ 611
Wed 4/911:55 a.m.YOW - OPO
2 stops25h 45mMultiple Airlines
Deal found 26/3C$ 651
Mon 17/611:55 a.m.YOW - OPO
1 stop18h 50mAir Transat
Deal found 28/3C$ 660
Mon 17/611:55 a.m.YOW - OPO
1 stop18h 50mAir Transat
Deal found 27/3C$ 662

Find flights from Ottawa to Porto within your budget

Customize your flight search to find flights from Ottawa to Porto 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 586,909 searches. Data last updated 28 March 2024.

Fly from

Any airport

Fly to

Any airport

Budget

C$ 940 - C$ 1,923

Route

Depart

Return

Price

OttawaPorto

YOW - OPO

YOWOPO

Ottawa

Thu 23/5

2 stops14h 05m

Porto

Thu 20/6

1 stop26h 32m

C$ 940

OttawaPorto

YOW - OPO

YOWOPO

Ottawa

Wed 15/5

1 stop22h 55m

Porto

Thu 23/5

1 stop15h 58m

C$ 957

OttawaPorto

YOW - OPO

YOWOPO

Ottawa

Mon 13/5

2 stops31h 25m

Porto

Thu 23/5

1 stop15h 58m

C$ 1,016

OttawaPorto

YOW - OPO

YOWOPO

Ottawa

Mon 15/4

2 stops17h 50m

Porto

Mon 22/4

2 stops29h 02m

C$ 1,035

OttawaPorto

YOW - OPO

YOWOPO

Ottawa

Sun 12/5

1 stop22h 55m

Porto

Sat 25/5

1 stop31h 48m

C$ 1,249

OttawaPorto

YOW - OPO

YOWOPO

Ottawa

Thu 9/5

1 stop10h 50m

Porto

Mon 27/5

1 stop12h 38m

C$ 1,279

OttawaPorto

YOW - OPO

YOWOPO

Ottawa

Tue 14/5

2 stops19h 30m

Porto

Thu 23/5

1 stop14h 29m

C$ 1,356

OttawaPorto

YOW - OPO

YOWOPO

Ottawa

Mon 13/5

2 stops17h 40m

Porto

Fri 24/5

2 stops27h 30m

C$ 1,921

OttawaPorto

YOW - OPO

YOWOPO

Ottawa

Thu 27/6

1 stop17h 30m

Porto

Mon 29/7

1 stop27h 30m

C$ 1,923

Flights are sorted by cheapest first

Deals found on 27/3

When is the cheapest time to fly from Ottawa to Porto?

Use this chart to determine the cheapest time to fly round-trip from Ottawa to Porto. Price data was last updated on 24 March 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Ottawa to Porto flight should consider departing on Thursday evenings when fares are most often at their lowest. Wednesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Porto by month

Plan your trip from Ottawa to Porto by taking into account the cheapest months to travel. The average price of a one-way flight from Ottawa to Porto is currently C$ 590 while a round-trip flight costs C$ 1,297. Price data was last updated on 24 March 2024.

Currently, February is the cheapest month in which you can book a flight from Ottawa to Porto (average of C$ 513). Flying from Ottawa to Porto in July is currently the most expensive (average of C$ 838). 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.

January

C$ 742

February

C$ 697

March

C$ 819

April

C$ 894

May

C$ 981

June

C$ 991

July

C$ 1,139

August

C$ 1,106

September

C$ 1,057

October

C$ 874

November

C$ 735

December

C$ 770

Temperature and rainfall in Porto by month

Plan your trip to Porto by taking into account the average temperature and rainfall totals by month.

OPO

Temperature

9 - 20 °C

Reviews of airlines servicing Porto

Get insights into the airlines that provide service to Porto. 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 Porto. Reviews last updated 28 March 2024.
Peruse reviews from past customers who have flown with SWISS, Air Transat and Air Canada from Ottawa to Porto to help guide your decision. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
7.9
Good
1,684 reviews

Overall

7.9

Boarding

7.8

Comfort

7.6

Entertainment

7.3

Crew

8.4

Food

7.3

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

7.9
Good
1,684 reviews
7.9
Good
1,684 reviews

Overall

7.9

Boarding

7.8

Comfort

7.6

Entertainment

7.3

Crew

8.4

Food

7.3

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

7.8
Good
2,150 reviews
7.9
Good
1,684 reviews

Overall

7.9

Boarding

7.8

Comfort

7.6

Entertainment

7.3

Crew

8.4

Food

7.3

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

7.6
Good
1,885 reviews
7.9
Good
1,684 reviews

Overall

7.9

Boarding

7.8

Comfort

7.6

Entertainment

7.3

Crew

8.4

Food

7.3

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

7.6
Good
515 reviews
7.9
Good
1,684 reviews

Overall

7.9

Boarding

7.8

Comfort

7.6

Entertainment

7.3

Crew

8.4

Food

7.3

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

7.3
Good
450 reviews
7.9
Good
1,684 reviews

Overall

7.9

Boarding

7.8

Comfort

7.6

Entertainment

7.3

Crew

8.4

Food

7.3

Reviews

1 / 10

Departure was late. Plane much too small for an 11 hour flight. One bathroom was out of order in a completely full flight.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • Can I find flights from Ottawa to Porto for under C$ 1,000 on Cheapflights?

    Yes, there are multiple flights from Ottawa to Porto for under C$ 1,000. The cheapest flight booked recently is on Air Transat for just C$ 940, but on average you can expect to pay C$ 1,158.

  • What are the cheapest airlines flying from Ottawa to Porto round-trip?

    Our cheapest airline available from Ottawa to Porto is Air Transat. Our recent data shows that you can find tickets from as low as C$ 940 on this airline. Additional options worth looking into are SWISS and Porter Airlines, starting at C$ 1,035 and C$ 1,249 round-trip. You may be able to fly from Ottawa to Porto for 27% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Ottawa to Porto one-way?

    For one-way options, check prices for Air Transat. According to our data, you can fly for as low as C$ 611. Users have also found prices from C$ 989 and C$ 1,034 on TAP AIR PORTUGAL and Air Canada, respectively.

  • What are the most popular airlines that fly from Ottawa to Porto?

  • What does YOW to OPO mean?

    This is defined as Ottawa Airport (YOW) and Porto Airport (OPO). Codes like Porto Airport are often used to just call airports uniquely.

  • Can I find deals for flights from Ottawa to Porto that include extra baggage allowance?

    The amount of baggage you can bring depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Ottawa to Porto with specific airlines?

    Yes, Cheapflights allows you to browse and filter flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Ottawa to Porto that include hotel bookings?

    Yes. In addition to deals on Ottawa to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to see available direct flights.

  • Can I find deals for business class flights from Ottawa to Porto?

    Yes. Cheapflights offers flight deals from Ottawa to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Ottawa to Porto that allow pets onboard?

    Many airlines do offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • How recently were the Ottawa to Porto flight deals updated?

    The Ottawa to Porto flight deals you see on this page were last updated on 28/3.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 6 airlines flying from Ottawa to Porto

Discover the top 6 airlines that operate flights from Ottawa to Porto. 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 586,909 searches. Data last updated 28 March 2024.
AirlineCheapestAverageFlexibilityOn-time
Air TransatCheapestC$ 851AverageC$ 1,028FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
LufthansaCheapestC$ 878AverageC$ 1,104FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Porter AirlinesCheapestC$ 888AverageC$ 912FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
SWISSCheapestC$ 895AverageC$ 973FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Azores AirlinesCheapestC$ 943AverageC$ 1,047FlexibilityNo cancel feeOn-time74%
Search Azores Airlines flights
Air CanadaCheapestC$ 1,011AverageC$ 1,274FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Search flights from Ottawa to Porto by cabin class

Find flights from Ottawa to Porto, based on your preferred cabin class, be it economy, premium economy, business, or first class.

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 Ottawa to Porto?

Cheapflights makes it easy to find Ottawa to Porto flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Porto?

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 Porto from Ottawa.

Can Cheapflights find flights from Ottawa to Porto with no change fees?

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

Can Cheapflights notify me if prices for flights from Ottawa to Porto become cheaper?

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

Can I find deals on last-minute flights from Ottawa to Porto?

Yes, you can often find last-minute deals on Ottawa to Porto flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

How can I compare prices from different travel booking sites for flights from Ottawa to Porto?

Cheapflights aggregates prices from various travel booking sites. This allows you to compare prices and choose the best deal.

Can I find deals for flights from Ottawa to Porto that offer flexible cancellation policies?

Cancellation policies vary by airline and fare type. After entering your flight details, you can view the cancellation policies for each deal in the search results. Some deals may offer flexibility in terms of cancellation and changes.