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Cheap flights from Ottawa to Portsmouth from C$ 519

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 17/8. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LHR
8 jul. — 15 jul.1
1 adult

Cheap flight deals from Ottawa to Portsmouth

Keep the following information in mind while searching for Ottawa to Portsmouth flight deals. Data was last updated 3 julio 2025.

Round-trip from

C$ 1,686

One-way from

C$ 519

Popular in

December

Cheapest in

February

Average price

C$ 1,089
24/8-6/9
  • 24/8-6/9
  • 4 total stops
  • 75h 59m total
  • Ottawa to Portsmouth
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17/8
  • 17/8
  • 3 total stops
  • 45h 45m total
  • Ottawa to Portsmouth
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 90 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 33 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Ottawa to Portsmouth

Cheapest flights from Ottawa to Portsmouth
Explore the most affordable flight options available from Ottawa to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 julio 2025.

dom. 24/88:55 p.m.YOW - SOU
2 stops41h 35mMultiple Airlines
sáb. 6/99:40 a.m.SOU - YOW
2 stops34h 24mMultiple Airlines
Deal found 2/7C$ 1,686
sáb. 9/85:15 p.m.YOW - SOU
2 stops18h 45mKLM
dom. 17/85:35 p.m.SOU - YOW
2 stops26h 30mKLM
Deal found 1/7C$ 1,735
mar. 8/79:20 a.m.YOW - SOU
2 stops17h 45mAer Lingus
vie. 18/79:40 a.m.SOU - YOW
2 stops16h 40mAer Lingus
Deal found 3/7C$ 1,932

Cheapflights Fare Finder

Customize your flight search to find flights from Ottawa to Portsmouth 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 3 julio 2025.
Use the filters below to find and compare flights from Ottawa to Portsmouth that are best for you.

Fly from

Ottawa

Fly to

Portsmouth

Route

Depart

Return

Price

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

dom. 24/8

8:55 p.m.-7:30 p.m.

2 stops41h 35m

Southampton Eastleigh

sáb. 6/9

9:40 a.m.-3:04 p.m.

2 stops34h 24m

C$ 1,686

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

sáb. 9/8

5:15 p.m.-5:00 p.m.

2 stops18h 45m

Southampton Eastleigh

dom. 17/8

5:35 p.m.-3:05 p.m.

2 stops26h 30m

C$ 1,735

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

dom. 17/8

5:55 a.m.-8:40 a.m.

3 stops45h 45m

C$ 519

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Best time to book a flight from Ottawa to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Ottawa 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 Ottawa to Portsmouth

What is the cheapest month to book a flight from Ottawa to Portsmouth?

Currently, January is the cheapest month in which you can book a flight from Ottawa to Portsmouth (average of C$ 560). Flying from Ottawa to Portsmouth in July is currently the most expensive (average of C$ 857). 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 YOW to P0R?

Find hourly flight availability from Ottawa to Portsmouth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 3 julio 2025.

When flying from Ottawa to Portsmouth, 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 Portsmouth

Get insights into the airlines that provide service to Portsmouth. 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 Portsmouth. Reviews last updated 3 julio 2025.
Read reviews from past customers who have flown KLM from Ottawa to Portsmouth. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,367 reviews
Check prices

Entertainment

7.1

Crew

8.4

Food

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,367 reviews
KLM
7.8
Good
1,367 reviews
Check prices

Entertainment

7.1

Crew

8.4

Food

7.2

Comfort

7.7

Boarding

7.8

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Portsmouth. 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 from for flights from Ottawa to Portsmouth?

    Located just 10.6 km from the city centre, Ottawa is the airport most travellers will use when flying to Portsmouth from Ottawa. Booking flights from Ottawa (YOW) to Portsmouth should be relatively easy as there are 0 daily outbound flights to Portsmouth from 8 different airlines.

  • What are the most reliable airlines from Ottawa to Portsmouth?

    Consider Air Canada (77%), Aegean Airlines (77%) or Austrian Airlines (77%) when booking your flight. These represent the most reliable airlines when flying from Ottawa to Portsmouth.

  • What are the cheapest flights from Ottawa to Portsmouth?

    Looking at all options, your cheapest flight can be booked for C$ 966. While the most popular route (Ottawa - Southampton Eastleigh) can be booked for C$ 1,686 on average our data indicates C$ 1,972 when flying from Ottawa to Portsmouth.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ottawa to Portsmouth 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 Ottawa to Portsmouth?

    Currently, January is the cheapest month in which you can book a flight from Ottawa to Portsmouth (average of C$ 560). Flying from Ottawa to Portsmouth in July is currently the most expensive (average of C$ 857). 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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Alternative routes for Ottawa to Portsmouth

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Top 8 airlines flying from Ottawa to Portsmouth

Discover the top 8 airlines that operate flights from Ottawa to Portsmouth. 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 3 julio 2025.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapestC$ 722AverageC$ 812FlexibilityNo cancel feeOn-time72%
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Air FranceCheapestC$ 722AverageC$ 897FlexibilityNo cancel feeOn-time77%
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Air TransatCheapestC$ 785AverageC$ 1,016FlexibilityNo cancel feeOn-time50%
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KLMCheapestC$ 818AverageC$ 1,213FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapestC$ 887AverageC$ 983FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 893AverageC$ 1,036FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Porter AirlinesCheapestC$ 897AverageC$ 1,049FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
LufthansaCheapestC$ 944AverageC$ 1,047FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Ottawa to Portsmouth?

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

Certainly. Search results for flights to Portsmouth from Ottawa shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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