Cheap Flights from Philadelphia (PHL) to Sion (SIR)

Popular airlines from Philadelphia Intl. Airport (PHL) to Sion (SIR)

Cheap Flights from Philadelphia to Sion (PHL-SIR)

Prices were available within the past 7 days and start at for one-way flights and $1,361 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sun, Mar 22 - Sat, Mar 28
PHL
Philadelphia
SIR
Sion
$1,361 Roundtrip, found 20 hours ago
$1,361
Roundtrip
found 20 hours ago
Select United flight, departing Sun, Mar 22 from Philadelphia to Sion, returning Sat, Mar 28, priced at $1,361 found 20 hours ago
United
Sun, Mar 22 - Sat, Mar 28
PHL
Philadelphia
SIR
Sion
$1,365 Roundtrip, found 20 hours ago
$1,365
Roundtrip
found 20 hours ago
Select United flight, departing Sun, Mar 22 from Philadelphia to Sion, returning Sat, Mar 28, priced at $1,365 found 20 hours ago

Frequently asked questions

How much does a flight from Philadelphia Intl. Airport (PHL) to Sion Airport (SIR) cost?
Snag a cheap one-way flight or cheap return flight from $1,361 from Philadelphia Intl. Airport (PHL) to Sion Airport (SIR) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Philadelphia Intl. Airport (PHL) to Sion Airport (SIR)?
The cheapest month to fly from PHL to SIR is March, when there's less demand. Off-peak season is typically when better flight deals are available between these airports.
What is the cheapest airline that flies from Philadelphia Intl. Airport (PHL) to Sion Airport (SIR)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from PHL to SIR. Then, sort your results by "Price (lowest to highest)" to snap up the best deal available.
How many flights per day from Philadelphia Intl. Airport (PHL) to Sion Airport (SIR)?
There are no daily direct flights available from Philadelphia Intl. Airport (PHL) to Sion Airport (SIR). But you can book flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be on your way before you know it.
What day of the week has the most flights from PHL to SIR?
Generally you'll have the most choice when it comes to flights on a Friday. Tuesdays tend to be the quietest.* But this can vary depending on the time of year, carrier 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 Philadelphia Intl. Airport (PHL) to Sion Airport (SIR)?
To avoid potential delays on the Philadelphia Intl. Airport (PHL) to Sion Airport (SIR) route, aim to travel before 3 PM. Flights after this time have a 22% higher chance of being 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 Philadelphia Intl. Airport (PHL) to Sion Airport (SIR) last-minute?
Booking your plane ticket from PHL to SIR just before your getaway is generally more expensive. But if you're flexible with your travel times and dates, you could grab a cheap last-minute fare.
Is it cheaper to book a PHL to SIR flight and hotel package?
Securing a PHL to SIR flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels in one place. Choose from our impressive range of accommodations and then add car rentals, flights and activities to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Philadelphia Intl. Airport (PHL) to Sion Airport (SIR)?
It's usually possible to reschedule or cancel your PHL to SIR flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Origin airport
Philadelphia Intl.
Destination airport
Sion
Roundtrip price
$1,360
Distance
3999 mi

Book with confidence

Philadelphia to Sion Flights

The cheapest times to fly from Philadelphia 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 Philadelphia to Sion are during the month of March. You can find some of the cheapest flights from Philadelphia to Sion with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Philadelphia to Sion

Sunday is one of the best days to book for cheap flights from Philadelphia 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 Philadelphia 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 Philadelphia 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 Philadelphia 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 Philadelphia 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.

 

Philadelphia to Sion Flights

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*Available to One Key members.