United Flight NK3645 Deals & Information (2025/2026)

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United Flight 3645 Route Deals From $76

The cheapest prices found with in the last 7 days for return flights were $149 and $76 for one-way flights to Louis Armstrong New Orleans Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Sep 27 - Thu, Oct 2
ORD
O'Hare Intl.
MSY
Louis Armstrong New Orleans Intl.
$149 Roundtrip, found 1 day ago
$149
Roundtrip
found 1 day ago
Select United flight, departing Sat, Sep 27 from O'Hare Intl. to Louis Armstrong New Orleans Intl., returning Thu, Oct 2, priced at $149 found 1 day ago

Frequently asked questions

What route does flight number UA3645 take?
UA3645 is used on a range of routes. Most commonly, UA3645 flies directly from O'Hare Intl. Airport (ORD) to Missoula Intl. Airport. If you have a ticket on this route, you'll be airborne for 3 hours and 49 minutes.
What terminal does UA3645 fly out of?
UA3645 flights from O'Hare Intl. Airport (ORD) normally depart from Terminal 2. This flight number runs on several routes, but the most traveled one is O'Hare Intl. Airport (ORD) to Missoula, MT Airport (MSO-Missoula Intl.).
What kind of plane is on flight number UA3645?
If you're taking flight UA3645 from Chicago, IL Airport (ORD-O'Hare Intl.) to Missoula Intl. Airport (MSO), there's a strong chance you'll be setting off on the Embraer 170. Flight UA3645 serves several 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 UA3645 flight with Travelocity, please visit our Customer Service Portal.