$519 Cheap Flights from Chicago (ORD) to Sion (SIR)

View $519 flight on Wed, Nov 26, 2025Opens in a new window

Popular airlines from Chicago O'Hare Intl. Airport (ORD) to Sion (SIR)

Cheap Flights from Chicago to Sion (ORD-SIR)

Prices were available within the past 7 days and start at $519 for one-way flights and $900 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Nov 26 - Wed, Dec 3
ORD
Chicago
SIR
Sion
$900 Roundtrip, found 1 day ago
$900
Roundtrip
found 1 day ago
Select United flight, departing Wed, Nov 26 from Chicago to Sion, returning Wed, Dec 3, priced at $900 found 1 day ago
United
Sat, May 30 - Wed, Aug 5
ORD
Chicago
SIR
Sion
$1,726 Roundtrip, found 2 days ago
$1,726
Roundtrip
found 2 days ago
Select United flight, departing Sat, May 30 from Chicago to Sion, returning Wed, Aug 5, priced at $1,726 found 2 days ago
United
Sat, May 30 - Wed, Aug 5
ORD
Chicago
SIR
Sion
$1,802 Roundtrip, found 2 days ago
$1,802
Roundtrip
found 2 days ago
Select United flight, departing Sat, May 30 from Chicago to Sion, returning Wed, Aug 5, priced at $1,802 found 2 days ago
United
Sat, May 30 - Wed, Aug 5
ORD
Chicago
SIR
Sion
$1,861 Roundtrip, found 2 days ago
$1,861
Roundtrip
found 2 days ago
Select United flight, departing Sat, May 30 from Chicago to Sion, returning Wed, Aug 5, priced at $1,861 found 2 days ago
United
Sat, May 30 - Wed, Aug 5
ORD
Chicago
SIR
Sion
$1,937 Roundtrip, found 2 days ago
$1,937
Roundtrip
found 2 days ago
Select United flight, departing Sat, May 30 from Chicago to Sion, returning Wed, Aug 5, priced at $1,937 found 2 days ago
United
Sat, May 30 - Wed, Aug 5
ORD
Chicago
SIR
Sion
$2,085 Roundtrip, found 2 days ago
$2,085
Roundtrip
found 2 days ago
Select United flight, departing Sat, May 30 from Chicago to Sion, returning Wed, Aug 5, priced at $2,085 found 2 days ago
United
Sat, May 30 - Wed, Aug 5
ORD
Chicago
SIR
Sion
$2,161 Roundtrip, found 2 days ago
$2,161
Roundtrip
found 2 days ago
Select United flight, departing Sat, May 30 from Chicago to Sion, returning Wed, Aug 5, priced at $2,161 found 2 days ago
United
Wed, Nov 26 - Wed, Dec 3
ORD
Chicago
SIR
Sion
$3,451 Roundtrip, found 1 day ago
$3,451
Roundtrip
found 1 day ago
Select United flight, departing Wed, Nov 26 from Chicago to Sion, returning Wed, Dec 3, priced at $3,451 found 1 day ago
United
Sat, May 30 - Wed, Aug 5
ORD
Chicago
SIR
Sion
$4,009 Roundtrip, found 2 days ago
$4,009
Roundtrip
found 2 days ago
Select United flight, departing Sat, May 30 from Chicago to Sion, returning Wed, Aug 5, priced at $4,009 found 2 days ago
United
Sat, May 30 - Wed, Aug 5
ORD
Chicago
SIR
Sion
$4,112 Roundtrip, found 2 days ago
$4,112
Roundtrip
found 2 days ago
Select United flight, departing Sat, May 30 from Chicago to Sion, returning Wed, Aug 5, priced at $4,112 found 2 days ago
United
Sat, May 30 - Wed, Aug 5
ORD
Chicago
SIR
Sion
$4,237 Roundtrip, found 2 days ago
$4,237
Roundtrip
found 2 days ago
Select United flight, departing Sat, May 30 from Chicago to Sion, returning Wed, Aug 5, priced at $4,237 found 2 days ago

Frequently asked questions

How much does a flight from O'Hare Intl. Airport (ORD) to Sion Airport (SIR) cost?
Secure a cheap one-way flight from $519 or cheap return flight from $900 from O'Hare Intl. Airport (ORD) to Sion Airport (SIR) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from O'Hare Intl. Airport (ORD) to Sion Airport (SIR)?
The cheapest month to fly from ORD to SIR is November, when there's less demand. Off-peak season is usually when better flight deals are available between these airports.
What is the cheapest airline that flies from O'Hare Intl. Airport (ORD) to Sion Airport (SIR)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest ORD to SIR flight.
How many flights per day from O'Hare Intl. Airport (ORD) to Sion Airport (SIR)?
Nonstop flights from O'Hare Intl. Airport (ORD) to Sion Airport (SIR) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your travel dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from ORD to SIR?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from O'Hare Intl. Airport (ORD) to Sion Airport (SIR)?
To avoid possible delays on the O'Hare Intl. Airport (ORD) to Sion Airport (SIR) route, fly before 3 PM. Departures after this hour have a 22% higher chance of cancellation.**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 O'Hare Intl. Airport (ORD) to Sion Airport (SIR) last-minute?
Holding off until just before your departure to book a flight from ORD to SIR often results in higher prices. Although you may find some last-minute discounts, they're not always guaranteed. Allow some flexibility in your schedule to boost your chances of scoring a bargain.
Is it cheaper to book an ORD to SIR flight and hotel package?
Securing an ORD to SIR flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip all in one place. Select from our extensive 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 O'Hare Intl. Airport (ORD) to Sion Airport (SIR)?
If you booked your ORD to SIR flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of fare you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, go to our Customer Service portal for more details.

Travel information

Origin airport
O'Hare Intl.
Destination airport
Sion
Roundtrip price
$900
Distance
4432 mi

Book with confidence

Chicago to Sion Flights

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

 

The best time to book a flight from Chicago to Sion

Sunday is one of the best days to book for cheap flights from Chicago 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 Chicago 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 Chicago to Sion in 2025. You can also book with separate airlines for your outbound and return journeys, from $519 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 Chicago 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 Chicago 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.

 

Chicago to Sion Flights

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*Available to One Key members.