United Flight 3870 Deals & Information (2026/2027)

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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.