Cheap Flights from Portland (PDX) to Sion (SIR)

Popular airlines from Portland International Airport (PDX) to Sion (SIR)

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Cheap Flights from Portland to Sion (PDX-SIR)

Prices were available within the past 7 days and start at for one-way flights and $925 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Nov 10 - Mon, Nov 17
PDX
Portland
SIR
Sion
$925 Roundtrip, found 4 days ago
$925
Roundtrip
found 4 days ago
Select United flight, departing Mon, Nov 10 from Portland to Sion, returning Mon, Nov 17, priced at $925 found 4 days ago
United
Mon, Nov 10 - Mon, Nov 17
PDX
Portland
SIR
Sion
$930 Roundtrip, found 4 days ago
$930
Roundtrip
found 4 days ago
Select United flight, departing Mon, Nov 10 from Portland to Sion, returning Mon, Nov 17, priced at $930 found 4 days ago
United
Mon, Nov 10 - Mon, Nov 17
PDX
Portland
SIR
Sion
$998 Roundtrip, found 4 days ago
$998
Roundtrip
found 4 days ago
Select United flight, departing Mon, Nov 10 from Portland to Sion, returning Mon, Nov 17, priced at $998 found 4 days ago
United
Wed, Jun 10 - Mon, Jun 15
PDX
Portland
SIR
Sion
$7,468 Roundtrip, found 4 days ago
$7,468
Roundtrip
found 4 days ago
Select United flight, departing Wed, Jun 10 from Portland to Sion, returning Mon, Jun 15, priced at $7,468 found 4 days ago
United
Wed, Jun 10 - Mon, Jun 15
PDX
Portland
SIR
Sion
$7,986 Roundtrip, found 4 days ago
$7,986
Roundtrip
found 4 days ago
Select United flight, departing Wed, Jun 10 from Portland to Sion, returning Mon, Jun 15, priced at $7,986 found 4 days ago
United
Wed, Jun 10 - Mon, Jun 15
PDX
Portland
SIR
Sion
$8,004 Roundtrip, found 4 days ago
$8,004
Roundtrip
found 4 days ago
Select United flight, departing Wed, Jun 10 from Portland to Sion, returning Mon, Jun 15, priced at $8,004 found 4 days ago
United
Sat, Mar 21 - Sun, Mar 29
PDX
Portland
SIR
Sion
$9,982 Roundtrip, found 4 days ago
$9,982
Roundtrip
found 4 days ago
Select United flight, departing Sat, Mar 21 from Portland to Sion, returning Sun, Mar 29, priced at $9,982 found 4 days ago
United
Sat, Mar 21 - Sun, Mar 29
PDX
Portland
SIR
Sion
$10,000 Roundtrip, found 4 days ago
$10,000
Roundtrip
found 4 days ago
Select United flight, departing Sat, Mar 21 from Portland to Sion, returning Sun, Mar 29, priced at $10,000 found 4 days ago
United
Sat, Mar 21 - Sun, Mar 29
PDX
Portland
SIR
Sion
$11,322 Roundtrip, found 4 days ago
$11,322
Roundtrip
found 4 days ago
Select United flight, departing Sat, Mar 21 from Portland to Sion, returning Sun, Mar 29, priced at $11,322 found 4 days ago
United
Sat, Mar 21 - Sun, Mar 29
PDX
Portland
SIR
Sion
$11,340 Roundtrip, found 4 days ago
$11,340
Roundtrip
found 4 days ago
Select United flight, departing Sat, Mar 21 from Portland to Sion, returning Sun, Mar 29, priced at $11,340 found 4 days ago

Frequently asked questions

How much does a flight from Portland Intl. Airport (PDX) to Sion Airport (SIR) cost?
Snag a cheap one-way flight or cheap return flight from $925 from Portland Intl. Airport (PDX) to Sion Airport (SIR) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Portland Intl. Airport (PDX) to Sion Airport (SIR)?
The cheapest month to fly from PDX to SIR is November, when there's less demand. Off-peak season is generally when airlines offer better prices between these airports.
What is the cheapest airline that flies from Portland Intl. Airport (PDX) to Sion Airport (SIR)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest PDX to SIR flight.
How many flights per day from Portland Intl. Airport (PDX) to Sion Airport (SIR)?
You'll need to take a flight with a layover if you're traveling from Portland Intl. Airport (PDX) to Sion Airport (SIR). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to discover the best option for your trip.
What day of the week has the most flights from PDX to SIR?
Generally you'll find the largest variety of flight choices on a Friday. Tuesdays tend to be the quietest.* However, this can vary depending on the airline, season and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Portland Intl. Airport (PDX) to Sion Airport (SIR)?
Select a flight from Portland Intl. Airport (PDX) to Sion Airport (SIR) that takes off before 3 PM to reduce the risk of cancellations and delays. Later departures are on average 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Portland Intl. Airport (PDX) to Sion Airport (SIR) last-minute?
Last-minute fares from PDX to SIR are usually more expensive. For the lowest prices, start looking for flights well ahead of time. That said, if your travel plans are flexible, it's possible to score a cheap fare just before your departure.
Is it cheaper to book a PDX to SIR flight and hotel package?
Compared with arranging hotels and flights separately, booking a PDX to SIR flight and hotel package with Expedia could lead to significant savings. Better yet, having everything in one place will take the stress out of travel planning. Simply secure your flights and select from our extensive range of stays, then personalize your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from Portland Intl. Airport (PDX) to Sion Airport (SIR)?
Usually, it's possible to cancel or reschedule your PDX to SIR flight. However, if it's been more than 24 hours since booking, additional charges may apply. Check your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Origin airport
Portland Intl.
Destination airport
Sion
Roundtrip price
$925
Distance
5400 mi

Book with confidence

Portland to Sion Flights

The cheapest times to fly from Portland to Sion

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Portland to Sion are during the month of November. You can find some of the cheapest flights from Portland to Sion with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Portland to Sion

Sunday is one of the best days to book for cheap flights from Portland to Sion: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Portland to Sion

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Portland to Sion in 2025. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Portland to Sion flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Portland to Sion airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Portland to Sion Flights

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*Available to One Key members.