United Flight 423 Deals & Information (2026/2027)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

United Flight 423 Route Deals From $1,759

The cheapest prices found with in the last 7 days for return flights were $2,557 and $1,759 for one-way flights to O'Hare Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Mar 21 - Mon, Mar 22
ATH
Eleftherios Venizelos
ORD
O'Hare Intl.
$2,557 Roundtrip, found 3 hours ago
$2,557
Roundtrip
found 3 hours ago
Select United flight, departing Sun, Mar 21 from Eleftherios Venizelos to O'Hare Intl., returning Mon, Mar 22, priced at $2,557 found 3 hours ago

Frequently asked questions

What route does flight number UA423 take?
UA423 is used on multiple routes. Mostly, UA423 flies directly from Portland Intl. Jetport to Dulles Intl. Airport. If that's your flight path, you'll be in the air for approximately 1 hour and 40 minutes.
What kind of plane is on flight number UA423?
If you've booked a seat on flight UA423 from Portland Intl. Jetport Airport (PWM) to Dulles Intl. Airport, there's a good chance you'll be on board an Airbus A319. This flight number serves numerous routes, but this is the most common one.
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA423 flight with Travelocity, please visit our Customer Service Portal.