United Flight 3870 Deals & Information (2025/2026)

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 3870 Route Deals From $419

The cheapest prices found with in the last 7 days for return flights were $524 and $419 for one-way flights to Shannon for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Aug 15 - Thu, Aug 27
ORD
O'Hare Intl.
SNN
Shannon
$524 Roundtrip, found 6 days ago
$524
Roundtrip
found 6 days ago
Select United flight, departing Sat, Aug 15 from O'Hare Intl. to Shannon, returning Thu, Aug 27, priced at $524 found 6 days ago
Sat, Aug 15 - Thu, Aug 27
ORD
O'Hare Intl.
SNN
Shannon
$534 Roundtrip, found 6 days ago
$534
Roundtrip
found 6 days ago
Select United flight, departing Sat, Aug 15 from O'Hare Intl. to Shannon, returning Thu, Aug 27, priced at $534 found 6 days ago
Sat, Aug 15 - Thu, Aug 27
ORD
O'Hare Intl.
SNN
Shannon
$563 Roundtrip, found 6 days ago
$563
Roundtrip
found 6 days ago
Select United flight, departing Sat, Aug 15 from O'Hare Intl. to Shannon, returning Thu, Aug 27, priced at $563 found 6 days ago
Thu, Sep 10 - Sat, Sep 19
ORD
O'Hare Intl.
SNN
Shannon
$573 Roundtrip, found 2 days ago
$573
Roundtrip
found 2 days ago
Select United flight, departing Thu, Sep 10 from O'Hare Intl. to Shannon, returning Sat, Sep 19, priced at $573 found 2 days ago
Tue, Apr 28 - Sun, May 10
ORD
O'Hare Intl.
SNN
Shannon
$587 Roundtrip, found 22 hours ago
$587
Roundtrip
found 22 hours ago
Select United flight, departing Tue, Apr 28 from O'Hare Intl. to Shannon, returning Sun, May 10, priced at $587 found 22 hours ago
Thu, Sep 10 - Sat, Sep 19
ORD
O'Hare Intl.
SNN
Shannon
$611 Roundtrip, found 2 days ago
$611
Roundtrip
found 2 days ago
Select United flight, departing Thu, Sep 10 from O'Hare Intl. to Shannon, returning Sat, Sep 19, priced at $611 found 2 days ago
Tue, Apr 28 - Sun, May 10
ORD
O'Hare Intl.
SNN
Shannon
$621 Roundtrip, found 22 hours ago
$621
Roundtrip
found 22 hours ago
Select United flight, departing Tue, Apr 28 from O'Hare Intl. to Shannon, returning Sun, May 10, priced at $621 found 22 hours ago
Wed, Sep 2 - Mon, Sep 7
ORD
O'Hare Intl.
SNN
Shannon
$623 Roundtrip, found 1 day ago
$623
Roundtrip
found 1 day ago
Select United flight, departing Wed, Sep 2 from O'Hare Intl. to Shannon, returning Mon, Sep 7, priced at $623 found 1 day ago
Thu, Sep 10 - Sat, Sep 19
ORD
O'Hare Intl.
SNN
Shannon
$625 Roundtrip, found 2 days ago
$625
Roundtrip
found 2 days ago
Select United flight, departing Thu, Sep 10 from O'Hare Intl. to Shannon, returning Sat, Sep 19, priced at $625 found 2 days ago
Thu, Sep 10 - Sat, Sep 19
ORD
O'Hare Intl.
SNN
Shannon
$627 Roundtrip, found 2 days ago
$627
Roundtrip
found 2 days ago
Select United flight, departing Thu, Sep 10 from O'Hare Intl. to Shannon, returning Sat, Sep 19, priced at $627 found 2 days ago
Tue, Apr 28 - Sun, May 10
ORD
O'Hare Intl.
SNN
Shannon
$653 Roundtrip, found 22 hours ago
$653
Roundtrip
found 22 hours ago
Select United flight, departing Tue, Apr 28 from O'Hare Intl. to Shannon, returning Sun, May 10, priced at $653 found 22 hours ago

Frequently asked questions

What route does flight number UA3870 take?
Flight number UA3870 takes 1 hour and 19 minutes to jet non-stop from Dulles Intl. Airport to Lehigh Valley International Airport. We all know there's magic in the destination, but half the fun is in the journey!
How often is UA3870 on time?
United Airlines flight number UA3870 from IAD to Allentown, PA Airport (ABE-Lehigh Valley Intl.) leaves on schedule 95% of the time — so you can relaxing knowing you'll get to your destination ASAP. If this flight happens to be delayed, the average wait time is approximately 8 minutes. This route has a star rating of 4.4.
What kind of plane is on flight number UA3870?
The Bombardier CRJ is the type of aircraft predominantly used for flight UA3870. More often than not, this flight leaves from Washington Dulles Intl. Airport (IAD) and touches down at ABE.
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 UA3870 flight with Travelocity, please visit our Customer Service Portal.